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The Role of Genotype-Environment Interaction in Adaptability
Item type: Journal Article • Journal: South African Forestry Journal • Authors: P.J. Robbertse --- D.R. De Wet Forestry Research Centre,The over sites ratio of clonal (familial) genotype-environment interaction (GEI) variance to mean trial variance determines the regression that is used to predict adaptability. Genotypic and environmental variances do not contribute significantly to this regression. Genotype x environment interaction effects... -
Geno-Phenotypic Regression and Juvenile-Mature Correlations: Methodological Tools for Clonal Selection of Eucalyptus Hybrids in Congo
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Jean-Marc Bouvet --- Centre Technique Forestier Tropical Department of the CIRAD, FranceThis paper discusses different ways to improve clonal selection and clonal variety propagation for the industrial plantations in Congo. -
The performance of tropical pastures in the drier phase of the Highland sourveld of Natal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.M. Brockett --- Department of Agriculture (Natal Region), N.N. Gray --- Department of Agriculture (Natal Region),Several tropical grasses (Acroceras macrum, Cenchrus ciliaris, Cyndon sp., Digitaria sp. and Pennisetum clandestinum) and legumes (Desmodium uncinatum and Lotononis bainesii) were evaluated at the Kokstad Research Station (Bioclimatic sub‐region 4f of Natal) over a period of seven years. The... -
Die produksie van smutsvingergras in die wes‐transvaal1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.S. Dannhauser --- Departement Landbou en Watervoorsiening, W.L.J. van Rensburg --- , D.P.J. Opperman --- , P.J. Vanrooyen --- ,Die produksie van Smutsvingergras (Digitaria eriantha) is in yerskeie proewe in die Hoëveldstreek, op Potchefstroom, in die verlede bepaal. Hierdie proewe is oor ‘n lang periode op verskillende grondsoorte en met verskillende bemestingspeile uitge‐voer. Alle resultate is saamgevoeg en met... -
Estimation of minimum temperature on a mesoscale
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Myburgh --- ,Working relationships between mean minimum temperatures and environmental factors by means of regression techniques were established and used to estimate temperatures at gridpoints. These estimated temperatures were then used with a computer package program to map the isotherms on a... -
Linear regression and stability measurements as possible aids in wheat selection trials
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.F. Marais --- ,The effectiveness of the linear regression approach to the handling of genotype X environment interactions was evaluated with respect to irrigated and dryland spring wheats, intermediate and winter wheats and spring barley. Joint regression analysis of yield data suggests that... -
The effects of environment on the relationship between cotton fibre properties and yarn characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.G. van Heerden --- , Republic of South Africa W.H. van Staden --- , Republic of South Africa H. van Ark --- , Republic of South AfricaCotton fibre samples from three different localities were commercially processed into 15 and 30 tex ring spun yarns and 20, 30 and 50 rotor spun yarns. Multiple regression analyses were used to relate yarn tenacity and irregularity to the different... -
AMMI analysis of potato cultivar yield trials
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.J. Steyn --- , Republic of South Africa A.F. Visser --- , Republic of South Africa MarieF. Smith --- , Republic of South Africa J.L. Schoeman --- , Republic of South AfricaPotatoes, Solanum tuberosum (L), are cultivated in South Africa under a variety of different climates and seasons. The wide environmental variation encountered and the confirmed occurrence of genotype-environmental interaction necessitates the use of criteria, other than averages, in the evaluation... -
Evaluering en kalibrering van CERES-Maize. 1. Nie-lineêre regressie om genetiese parameters te bepaal
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. du Toit --- , Republiek van Suid-Afrika P.J. van Rooyen --- , Republiek van Suid-Afrika J.J. Human --- Departement Agronomie, Republiek van Suid-AfrikaDie genetiese parameters van die meeste plaaslike mielie cultivars wat as inset van CERES-Maize benodig word, is nog nie bepaal nie. Sodanige parameters kan met behulp van bestaande oesdata en fenologiese datums, uit veldproewe afgelei word. Programmatuur kan gebruik word... -
Use of linear regression and correlation matrix in the evaluation of CERES3 (Maize)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. du Toit --- , South Africa J. Booysen --- , South Africa J.J. Human --- UOVS, Department of Agronomy, South AfricaA historical data set (soil water content, growth, phenology and yield) consisting of six cultivars and three planting dates was used to evaluate the CERES3 crop growth model. Linear regression and correlation matrix were used to identify algorithms in the... -
Statistical evaluation of the germination of Cleome gynandra L. seeds
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.O. Ochuodho --- , South Africa A.T. Modi --- , South AfricaRadicle protrusion and subsequent seedling establishment are two ways of defining seed germination. However, international rules for testing seeds adopted the first and final counts through consensus as defining stages of seed germination. In this study statistical guidelines have been... -
Relations between phosphorus retention parameters and some other properties of benchmark soils in Lesotho
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.F. Molete --- Department of Soil, Crop and Climate Sciences, South Africa C.C. du Preez --- Department of Soil, Crop and Climate Sciences, South Africa M.V. Marake --- , LesothoThe benchmark soils of Lesotho are characterized by high P retention and this aspect should be accommodated in fertilization programmes. This together with long procedures for determination of P retention parameters and a lack of information on the relations between... -
Ridge regression technique to determine the environmental influences on tef (Eragrostis tef) grain yield
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Legesse Kassa Debusho --- , Republic of South AfricaTef grain yield is dependent on a number of component characters such as plant height and panicle length. These characters and consequently yield are governed by a large number of factors including environmental factors. The objective of this paper was... -
Application of Partial Least Squares regression to relate tastiness of boiled potatoes to chemical and physical tests
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Marie F. Smith --- , South Africa Christine S. Leighton --- , South Africa Liesl Morey --- , South Africa Hettie C. Schönfeldt --- , South AfricaPartial Least Squares regression (PLS) was used to understand the relationship between 15 sensory attributes of potatoes boiled in their skins as dependent variables (Y), and six objective (chemical and physical) measurements as the independent variables (X). The ARC-Sensory Analysis... -
Targeting of early to intermediate maize hybrids for yield performanceand yield stability using SREG model
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.S. Setimela --- , Zimbabwe J. Crossa --- CIMMYT Km, D.F Mexico M. Bänziger --- CIMMYT Km, D.F MexicoThe effectiveness of targeting and predicting maize (Zea mays.L) hybrid performance is difficult when the magnitude of genotype x environment (GE) interaction and yield prediction cannot be interpreted and is only based on genotypes (G) and GE means. The traditional... -
The influence of stocking rate, range condition and rainfall on residual herbage mass in the semiarid savanna of KwaZulu/Natal
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G.P. Hatch --- Department of Grassland Science, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaGrazing trials at two sites in the semiarid savanna of KwaZulu‐Natal were stocked with cattle at light (0.17 LSU ha‐1), intermediate (0.23 LSU ha‐1) and heavy (0.30 LSU ha‐1) stocking. Pasture disc meter data collected over 116 three‐week periods were... -
Volume–biomass functions reveal the effect of browsing on three Moroccan dwarf shrubs
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Z Akasbi --- Biodiversity, Evolution and Ecology of Plants, Germany J Oldeland --- Biodiversity, Evolution and Ecology of Plants, Germany J Dengler --- Biodiversity, Evolution and Ecology of Plants, Germany M Finckh --- Biodiversity, Evolution and Ecology of Plants, GermanyWe studied the effects of browsing on the plant architecture and volume-biomass relationships of three dominant dwarf shrubs – Artemisia herba-alba, A. mesatlantica and Teucrium mideltense – in a sagebrush steppe in the Central High Atlas Mountains, southern Morocco. For... -
Savanna browse production. 2: Prediction
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Caryn A Penderis --- School of Life Sciences, South Africa Kevin P Kirkman --- Grassland Science, South AfricaBrowsing herbivores are generally highly selective feeders, selecting for new shoots and young plant material. Determinations of browser carrying capacity are then greatly inflated when based on available browse biomass estimates. Our study was initiated with the aim of modelling... -
The influence of sowing rate on the production and growth of wild oat (Avena fatua) in the depleted semi-arid rangelands of Jordan
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M.K.J. El-Shatnawi H.Z. GhoshehThe objective of this work was to determine the proper sowing rate of wild oat (Avena fatua) in the depleted north-eastern semi-arid grasslands of Jordan. Wild oat seeding rates of 15, 30, 45 and 60 kg ha−l were evaluated in... -
Predicting Leucaena leucocephala biomass from simple morphometrics
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: C.D. MorrisA non-destructive method is required for estimating the forage yield of small stands of Leucaena leucocephala. Non-linear regression was used to investigate the relationship between the height of leucaena trees and wood and edible dry matter (edm) yield, and the... -
Analysis of individual tree volume equations for Cupressus lusitanica in Munessa forest, Ethiopia
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: T. TeshomeThree different volume equations were fitted to individual tree volume (V) data collected on 260 Cupressus lusitanica trees from 49 plantations in Munessa Shashemene Forest, Ethiopia. The data were first split randomly into equation development and equation testing data sets... -
Growth modelling of Pinus roxburghii in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E.R. Falkenhagen --- , South AfricaThe growth in diameter at breast height, height and tree volume and plot density were studied in an unreplicated spacing trial of Pinus roxburghii at Weza, South Africa. -
An investigation into the occurrence and nature of genotype by environment interaction in Pinus patula
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: C.L. Snedden --- , South Africa S.D. Verryn --- , South AfricaThis study was conducted as part of a joint venture between the tree improvement teams of Safcol and the CSIR to develop a breeding, production and conservation strategy for Pinus patula. -
Sex Differences in the Attribution of Shame And Guilt
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Mark Brophy --- University of Johannesburg, Gert Kruger --- University of Johannesburg,This study examined how the sex of a participant could moderate the elicitation of shame and guilt. Four hundred ninety students (107 men and 383 women) between the age of 17 and 20 (M=18.66, SD=.80) volunteered to participate. Moderated multiple... -
Proportional growth and maturation in Penaeus indicus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HFB ChampionA least squares estimation of inflected linear regression is used to interpret the relationships between carapace length (CL) and total length, abdominal length and abdominal width respectively, in Penaeus indicus and Metapenaeus monoceros. In both species well-defined inflection points with... -
Emigrant's Transfers in Senegal: The Role of ICT
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Latif Dramani --- ,In 2011, remittances from Senegalese migrants constituted 86%1 of the funds required for the daily survival of recipient households. In this paper, we try to analyse the role of ICT in Senegalese emigrant's transfers through its impact on the household's... -
Gender Earnings Disparity and Discrimination in Urban China: Unconditional Quantile Regression
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Yao Tang --- School of Sociology and Social Policy, UK Wenjin Long --- School of Sociology and Social Policy, UKMarket-oriented economic reform has gone through several key stages to bring substantial changes to the current Chinese economy. It accelerated after 1992, and ushered in the pattern transformation since ‘scientific development outlook’ raised in 2002. During this dramatic and complicated... -
Simultaneous growth and yield models for Eucalyptus grandis (Hill) Maiden plantations in Zimbabwe
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Danaza Mabvurira --- Plantations Silviculture Research, Zimbabwe Jari Miina --- Faculty of Forestry, FinlandSimultaneous stand-level growth and yield models for Eucalyptus grandis in Zimbabwe were developed from Correlated Curve Trend (CCT) and NeIder wheel experiments replicated on five different sites. Nonlinear three-stage least squares method was used to simultaneously fit prediction and projection... -
Genotype by environment interaction for volume growth at 6 years of age in a series of five Pinus patula progeny trials in southern Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Arnulf Kanzler --- Sappi Forest Research, South Africa Sieg F. Hagedorn --- , South Africa Gary R. Hodge --- CAMCORE, USA William S. Dvorak --- CAMCORE, USAGenotype x environment interaction was investigated in a series of 5 Pinus patula progeny trials planted by the Institute for Commercial Forestry Research in southern Africa. The trials were established from Mpumalanga to the North-eastern Cape in a balanced 7x7... -
Equations for predicting the biomass of Acacia cyclops and Acacia saligna in the western and eastern Cape regions of South Africa Part 2: Stand-level models
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: A. van Laar --- Faculty of Agricultural and Forestry Sciences, J.M. Theron --- Faculty of Agricultural and Forestry Sciences,The study deals with stand-level models for estimating wood biomass for different tree sizes and different biomass categories. It was carried out on farms and nature reserves in three regions. The stratification was identical with that in part 1 of... -
How a dependent variable's non-randomness affects taper equation fitting
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Kitikidou Kyriaki --- Demokritian University of Thrace, Greece (Department of Forestry and Management of Environment and Natural Resources, Laboratory of Forest Biometry), GreeceIn order to apply the least squares method in regression analysis, the values of the dependent variable Y should be random. In an example of regression analysis linear and nonlinear taper equations, which estimate the diameter of the tree dh... -
Revised estimates of abundance of South African sardine and anchovy from acoustic surveys adjusting for echosounder saturation in earlier surveys and attenuation effects for sardine
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CL de Moor DS Butterworth JC CoetzeeHydro-acoustic surveys have been used to provide annual estimates of May recruitment and November spawner biomass of the South African sardine Sardinops sagax and anchovy Engraulis encrasicolus resources since 1984. These time-series of abundance estimates form the backbone of the... -
Imaging spectroscopy of foliar biochemistry in forestry environments
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: B Majeke JAN van Aardt MA ChoRemote sensing estimates of leaf biochemicals provide valuable information on ecosystem functioning, vitality and state at local to global spatial scales. This paper aims to give an overview of the state of the art of foliar biochemistry assessment in general... -
Modelling dimensional growth of three street tree species in the urban forest of the City of Tshwane, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: GH Stoffberg --- Department of Plant Science, South Africa MW van Rooyen --- Department of Plant Science, South Africa MJ van der Linde --- Department of Statistics, South Africa HT Groeneveld --- Department of Statistics, South AfricaTree height, crown height, crown diameter and stem diameter were measured for 282 trees of the indigenous species Combretum erythrophyllum, Searsia lancea and S. pendulina. Growth relationships were modelled using age as explanatory variable for stem diameter and subsequently stem... -
A condition index for African penguin Spheniscus demersus chicks
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Lubbe --- Animal Demography Unit, Department of Biological Sciences, South Africa LG Underhill --- Animal Demography Unit, Department of Biological Sciences, South Africa LJ Waller --- Animal Demography Unit, Department of Biological Sciences, South Africa J Veen --- VEDA Consultancy, The NetherlandsThe body condition of altricial seabird chicks is directly related to the amount of food received from their parents, which depends on feeding conditions at sea. An index of body condition is therefore a useful tool for assessing variation in... -
Soil properties and elements other than hydrogen that can affect the field calibration of a neutron water meter
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Reedah M Mampana --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Danie J Beukes --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Corrie M Swanepoel --- Agricultural Research Council–Institute for Soil, Climate and Water, South AfricaA neutron water meter (NWM) operates on the principle that emitted high-energy neutrons are thermalised by elastic collisions with atomic nuclei present in soil, such as that of the hydrogen atom. Thermalised neutrons, however, are affected by other nuclear-matter interactions... -
The South African labour market and the incubation of small businesses in South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Zeleke Worku --- Business School, Tshwane University of Technology, South AfricaSince April 1994, the South African Government and the trade unions have been working together as a means of realising sustained economic growth and development, job creation and the alleviation of poverty among the unemployed youth. The uneasy relationship between... -
Age, growth and reproduction of largemouth bass, Micropterus salmoides, in Lake Manyame, Zimbabwe
Item type: Journal Article • Journal: African Zoology • Authors: C.A. Beamish --- Department of Ichthyology and Fisheries Science, South Africa A.J. Booth --- Department of Ichthyology and Fisheries Science, South Africa N. Deacon --- Department of Ichthyology and Fisheries Science, South AfricaA total of 478 largemouth bass, Micropterus salmoides (Lacépède, 1802), was sampled between September 1997 and July 2001 using hook-and-line in Lake Manyame, a water supply reservoir situated outside Harare, Zimbabwe. Male fish dominated the samples, possibly an effect of... -
Climate and the evolution of group-living behaviour in the armadillo lizard (Ouroborus cataphractus)
Item type: Journal Article • Journal: African Zoology • Authors: Cindy Shuttleworth --- Department of Botany and Zoology, South Africa P. le Fras N. Mouton --- Department of Botany and Zoology, South Africa Adriaan van Niekerk --- Department of Geography and Environmental Studies, South AfricaWe evaluated the hypothesis that the regular use of the southern harvester termite, Microhodotermes viator, as food source by the armadillo lizard, Ouroborus cataphractus, originated as an adaptation to survive the summer dry season in a climatic regime where rainfall... -
Effect of the subprime mortgage crisis on a leading emerging market
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Jun Sik Kim --- Division of International Trade, Korea Doojin Ryu --- College of Economics, KoreaThis study examines how the US subprime mortgage crisis affects the behaviour of the Korean stock and futures market and how the futures traders react to the shocks related to the crisis. Analysing a unique and high-quality daily data set... -
A note on the estimation problems caused by thin-trading on the Johannesburg Stock Exchange
Item type: Journal Article • Journal: De Ratione • Authors: D. Bradfield --- University of Cape Town,The estimation problems caused by the effects of thin-trading are highlighted. In particular thin-trading is found to be the major cause of bias associated with the estimation of beta coefficients in smaller markets like the JSE. The empical study conducted... -
A comparison of multivariate discriminant and logistic regression analysis in the prediction of corporate failure in South Africa
Item type: Journal Article • Journal: De Ratione • Authors: P W Court --- Rhodes University, S E Radloff --- Rhodes University,The prediction of corporate failure, based on a specific model, is of vital importance to a large body of individuals. The two statistical methodologies which enjoy prominence in the literature when establishing these models are multivariate discriminant analysis and logistic... -
An investigation into the significance of certain firm-specific non-financial variables in a failure prediction model
Item type: Journal Article • Journal: De Ratione • Authors: P W Court --- Rhodes University,Most failure prediction models contain only financial ratios. There are nevertheless a number of firm-specific, non-financial ratios which could point to failure. This article attempts to Investigate the impact of some of these variables in a failure prediction model, it... -
Hooking mortality of scalloped hammerhead Sphyrna lewini and great hammerhead Sphyrna mokarran sharks caught on bottom longlines
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SJB Gulak --- Riverside Technology Inc., National Marine Fisheries Service, Panama City Laboratory, USA AJ de Ron Santiago --- Riverside Technology Inc., National Marine Fisheries Service, Panama City Laboratory, USA JK Carlson --- National Marine Fisheries Service, Panama City Laboratory, USAThe scalloped hammerhead Sphyrna lewini and the great hammerhead S. mokarran are typically caught as bycatch in a variety of fisheries and are listed as globally Endangered by the International Union for the Conservation of Nature. Due to very high... -
Influences on life aspirations among adolescents in a low-income community in Cape Town, South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Gaironeesa Hendricks [cor1] Shazly Savahl --- Department of Psychology, South Africa Kulthum Mathews --- Department of Psychology, South Africa Claudia Raats --- Department of Psychology, South Africa Labeeqah Jaffer --- Department of Psychology, South Africa Arnold Matzdorff --- Department of Psychology, South Africa Bianca Dekel --- Department of Psychology, South Africa Christelle Larke --- Department of Psychology, South Africa Tapiwa Magodyo --- Department of Psychology, South Africa Megan van Gesselleen --- Department of Psychology, South Africa Athena Pedro --- Department of Psychology, South AfricaThe aim of this study was to determine the influences on adolescents’ aspirations from a low-income community in Cape Town. A sequential mixed method exploratory design was used following two distinct phases. The qualitative phase comprised focus group interviews with... -
Validation of growth zone deposition in otoliths of two large endemic cyprinids in Lake Gariep, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Henning Winker --- Department of Ichthyology and Fisheries Science, South Africa Bruce R. Ellender --- Department of Ichthyology and Fisheries Science, South Africa Olaf L.F. Weyl --- South African Institute for Aquatic Biodiversity, South Africa Anthony J. Booth --- Department of Ichthyology and Fisheries Science, South AfricaWe tested the hypothesis that growth zones in the astericus otoliths of smallmouth yellowfish (Labeobarbus aeneus) and Orange River mudfish (Labeo capensis) were deposited annually. Two methods, fluorochrome marking and edge analysis of otoliths were used. For fluorochrome marking, specimens... -
Biomass equations for selected drought-tolerant eucalypts in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Darius Phiri --- Department of Forest and Wood Science, South Africa Pierre Ackerman --- Department of Forest and Wood Science, South Africa Brand Wessels --- Department of Forest and Wood Science, South Africa Ben du Toit --- Department of Forest and Wood Science, South Africa Marie Johansson --- Department of Building Technology, Sweden Harald Säll --- Department for Forestry and Wood Technology, Sweden Sven-Olof Lundqvist --- Wood and Fibre Measurement Laboratory, Innventia AB, Sweden Thomas Seifert --- Department of Forest and Wood Science, South AfricaIn the water-scarce environment of South Africa, drought-tolerant eucalypt species have the potential to contribute to the timber and biomass resource. Biomass functions are a necessary prerequisite to predict yield and carbon sequestration. In this study preliminary biomass models for... -
Statistical assessment of maize leaf nutrient and yield relationships in rural agriculture in the Mbizana area, Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Danie J Beukes --- Agricultural Research Council–Institute for Soil, South Africa Gcina G Jezile --- Agricultural Research Council–Institute for Soil, South Africa Thembisile C Mapumulo --- Agricultural Research Council–Institute for Soil, South Africa Thomas P Fyfield --- Agricultural Research Council–Institute for Soil, South AfricaA medium-term study was conducted under dry land to develop regression models to predict maize yield from leaf analyses for cost-effective fertiliser recommendations. Treatments consisted of lime, organic and inorganic fertiliser applications in a randomised complete block design with three... -
Understanding the role of forests in rural household economies: experiences from the Northern and Western provinces of Rwanda
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Edward Mutandwa --- Department of Rural Development and Agribusiness, College of Agriculture, Animal Sciences and Veterinary Medicine, Rwanda Richard Kanyarukiga --- Department of Rural Development and Agribusiness, College of Agriculture, Animal Sciences and Veterinary Medicine, RwandaForests have conventionally been seen as a source of products for sustaining resource-poor households. Nonetheless, forest management strategies have often not been designed to meet these pressing needs. The objectives of this research were to examine the contribution of forest... -
The development of a preliminary regression equation for estimating the weight of black South African paraplegic males using anthropometric measurements in Tshwane, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: H. Snyman --- Association for Dietetics in South Africa, Mg. Herselman --- Division of Human Nutrition, D. Labadarios --- Division of Human Nutrition,Abstract -
The influence of transformational leadership on organisational citizenship behaviour in a South African combat military unit
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Oscar Sechudi --- South African Army, South Africa Benny Olivier --- Department of Industrial and Organisational Psychology, South AfricaThis study investigated perceived individual transformational leadership (TL) to influence behaviours on follower organisational citizenship behaviour (OCB) in a South African combat military unit. A sample of 300 of 567 military followers (males = 78%; black Africans = 82%) completed... -
Heavy episodic alcohol drinking among students from a rural South African university: Correlates with personal-social variables
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Shai Nkoana --- Department of Psychology, South Africa Tholene Sodi --- Department of Psychology, South Africa Timotheus B. Darikwa --- Department of Statistics and Operations Research, South AfricaThe aim of the study was to explore the personal and social factors contributing to heavy episodic alcohol drinking (HEAD) in a sample of students from a rural South African university. A sample of 837 undergraduate students (females = 56.6%;... -
Effectiveness and efficiency of national systems of innovation: A comparative analysis of Ghana and Kenya
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Frank L. Bartels --- Innov-8 Policy Advisory Services Ltd, Austria Ritin Koria --- Innov-8 Policy Advisory Services Ltd, Austria Liliana Andriano --- Department of Sociology, United KingdomThis paper presents a comparative analysis of the determinants of the effectiveness and efficiency of the Ghana National System of Innovation (GNSI) and the Kenya National System of Innovation (KNSI) for crafting evidence-based policy. Two regression analyses are performed respectively... -
Genetic parameters for large white pigs reared under intensive management systems in Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: V. O. Ouko --- Department of Animal Science, Kenya E.D. Ilatsia --- Kenya Agricultural and Livestock Research Organization (KALRO), Kenya G. W. Oduho --- Department of Animal Science, Kenya D. K. Kios --- Department of Animal Science, KenyaA lack of performance parameters is one of the factors limiting the implementation of sustainable breeding strategies for the pig industry in Kenya. The objective of this study was to estimate genetic and phenotypic parameters for growth performance of Large... -
Improved usefulness of continental soil databases for agricultural management through local adaptation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mats Söderström --- International Center for Tropical Agriculture (CIAT), Kenya Kristin Piikki --- International Center for Tropical Agriculture (CIAT), Kenya Jeremy Cordingley --- Crop Nutrition Laboratory Services Ltd, KenyaThe usefulness of a continental digital soil map (AfSoilGrids250) was investigated at two levels relevant for agricultural fertiliser recommendations in Rwanda (point locations and administrative sector unit averages). Analysis of 900 soil samples for pH and soil organic carbon (SOC)... -
Determinants of external tax compliance costs: Evidence from South Africa
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Sharon Smulders --- Taxation Department, South Africa Madeleine Stiglingh --- Taxation Department, South Africa Riel Franzsen --- African Taxation Institute, University of Pretoria, South Africa Lizelle Fletcher --- Department of Statistics, South AfricaSmall businesses tend to rely on external service providers (tax practitioners, accountants, lawyers and bookkeepers) for assistance with their tax affairs. Payments to external service providers clearly affect a small business’s tax compliance costs. This study uses multiple regression analyses... -
The potential of NIRs as a non-destructive post-harvest quality assessment tool for ‘Triumph’ persimmon fruit
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Pesanai Zanamwe --- Department of Botany and Biotechnology, South AfricaThe potential of near-infrared spectroscopy (NIRs) as an alternative non-destructive post-harvest quality assessment tool for ‘Triumph’ persimmon fruit was assessed. Fruits were harvested at four stages of maturity and each stage was replicated four times. Fruit quality was assessed at... -
Predicting site productivity of the timber tree Pterocarpus angolensis
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vera De Cauwer --- Faculty of Natural Resources and Spatial Sciences, Namibia Esther Fichtler --- Tropical Plant Production and Agricultural Systems Modelling, Department of Crop Sciences, Germany Hans Beeckman --- Service of Wood Biology, Belgium F Patrick Graz --- Faculty of Natural Resources and Spatial Sciences, Namibia Jan Mertens --- Department of Applied Biosciences, Belgium Sam Van Holsbeeck --- Department of Applied Biosciences, Belgium Bart Muys --- Division of Forest, Nature and Landscape, BelgiumPterocarpus angolensis is an important timber tree of the miombo woodlands of sub-Saharan Africa. The species only grows in natural mixed forests and little is known about is productivity potential. This study aimed at investigating productivity of P. angolensis on... -
Authentic leadership influences on organisational commitment in a South African state hospital
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Veronica Hlongwane --- University of South Africa, South Africa Benny Olivier --- University of South Africa, South AfricaThis study investigated the influence of authentic leadership (AL) on employee organisational commitment (OC) in a South African state hospital. A convenience sample of 222 employees (female = 81%; black = 82%) completed the Authentic Leadership Questionnaire on their perceptions... -
Determinants of forage adoption and production niches among smallholder farmers in Kenya
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Donald MG Njarui --- Kenya Agricultural and Livestock Research Organization-Katumani, Kenya Mwangi Gatheru --- Kenya Agricultural and Livestock Research Organization-Katumani, Kenya Elias M Gichangi --- Kenya Agricultural and Livestock Research Organization-Katumani, Kenya Elikana M Nyambati --- Kenya Agricultural and Livestock Research Organization-Headquarters, Kenya Clotilda N Ondiko --- Kenya Agricultural and Livestock Research Organization-Mtwapa, Kenya Keziah W Ndungu-Magiroi --- Kenya Agricultural and Livestock Research Organization-Kitale, KenyaA study was conducted to assess factors that influence adoption of forages and choice of production niches in smallholder farms in Kenya. A total of 786 farmers (268 from coastal lowlands, 171 from eastern midlands, 132 from central highlands and... -
Modelling of an on-farm direct expansion bulk milk cooler to establish baseline energy consumption without milk pre-cooling: A case of Fort Hare Dairy Trust, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Russel Mhundwa --- Fort Hare Institute of Technology, South Africa Michael Simon --- Fort Hare Institute of Technology, South Africa Stephen Loh Tangwe --- Fort Hare Institute of Technology, South AfricaStorage of milk at a low temperature of 4°C inhibits bacterial growth. As such bulk milk coolers (BMC) are used for cooling and storage of milk on dairy farms. This paper presents performance monitoring of a direct expansion bulk milk... -
Estimating risk factors for HIV infection among women in Mozambique using population-based survey data
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Sara S Dias --- EpiDoC Unit, Centro de Estudos de Doenças Crónicas da NOVA Medical School, Portugal Francisco Mbofana --- Ministry of Health, Mozambique Sheyla R Cassy --- Departamento de Matemática e Informática, Faculdade de Ciências, Mozambique Sónia Dias --- Instituto de Higiene e Medicina Tropical, Portugal Gonçalo F Augusto --- Instituto de Higiene e Medicina Tropical, Portugal Victor Agadjanian --- Center of Population Dynamics, USA Maria R O Martins --- Instituto de Higiene e Medicina Tropical, PortugalThe use of population-based survey data together with sound statistical methods can enhance better estimation of HIV risk factors and explain variations across subgroups of the population. The distribution and determinants of HIV infection in populations must be taken into... -
Phytomass estimation using eMODIS NDVI and ground data in arid rangelands of Morocco
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hamid Mahyou --- Centre Régional de la Recherche Agronomique d’Oujda, Morocco Bernard Tychon --- Department of Environmental Sciences and Management, Belgium Marie Lang --- Department of Environmental Sciences and Management, Belgium Riad Balaghi --- Centre Régional de la Recherche Agronomique de Meknès, MoroccoThe assessment of rangeland productivity in semi-extensively grazed arid rangelands is a prerequisite for livestock management in relation to sustainable use of pastoral resources. The objective of this study was to assess rangeland productivity based on normalised difference vegetation index... -
International transmission of risk factor movements: The case of developed markets
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Hyung-Suk Choi --- School of Business, Korea Doojin Ryu --- College of Economics, Korea Heejin Yang --- School of Finance, KoreaUnder the Carhart four-factor system, this study examines the international transmission mechanism among country-specific risk factors by focusing on the cross-border transmission of factor innovation. We find that international stock markets are interrelated with respect to market, size, value and... -
Development of energy benchmarking protocol for commercial banks, Lagos state, Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: T. O. Akinbulire --- Department of Electrical/Electronic Engineering, Nigeria P. O. Oluseyi --- Department of Electrical/Electronic Engineering, Nigeria O. M. Babatunde --- Department of Electrical/Electronic Engineering, Nigeria A. E. Ayegbajeje --- Daystar Power Solutions, NigeriaEnergy consumption is a central factor taken into consideration as far as management decisions are concerned in any firm and the same goes for the banking industry. More importantly is the extent to which firms consume energy efficiently. In the... -
Consumers’ willingness to pay for safer vegetables in Tamale, Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mensah Tawiah Cobbinah --- Department of Agricultural and Resource Economics, Faculty of Agribusiness and Communication Sciences, Ghana Samuel Arkoh Donkoh --- Department of Agricultural and Resource Economics, Faculty of Agribusiness and Communication Sciences, Ghana Isaac Gershon Kodwo Ansah --- Department of Agricultural and Resource Economics, Faculty of Agribusiness and Communication Sciences, GhanaConsumers’ concerns over misuse of agrochemicals and untreated wastewater for irrigation in vegetable production are increasing demand for safer vegetables in urban cities. Providing safer vegetables requires production methods that minimize or eliminate the associated risks. Nevertheless, these practices involve... -
Modelling expected trout ranges under current and future water temperature regimes in the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NA Rivers-Moore --- Centre for Water Resources Research, South Africa BR Ellender --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa OLF Weyl --- Center for Invasion Biology, SAIAB, South AfricaDifferent values have resulted in conflicts between anglers and conservation lobbies in the management of trout in South Africa. Key to the conflict is the demarcation of boundaries to areas in which brown trout Salmo trutta and rainbow trout Oncorhynchus... -
Mixed-effect non-linear modelling for diameter estimation along the stem of Tectona grandis in mid-western Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Luciano Rodrigo Lanssanova --- Postgraduate Program of Forestry Sciences, Department of Forest Engineering, Brazil Sebastião do Amaral Machado --- Postgraduate Program of Forestry Engineering, Department of Forest Engineering, Brazil Alexandre Techy de Almeida Garrett --- Postgraduate Program of Forestry Sciences, Department of Forest Engineering, Brazil Izabel Passos Bonete --- Postgraduate Program of Forestry Sciences, Department of Forest Engineering, Brazil Allan Libanio Pelissari --- Postgraduate Program of Forestry Engineering, Department of Forest Engineering, Brazil Afonso Figueiredo Filho --- Postgraduate Program of Forestry Sciences, Department of Forest Engineering, Brazil Franciele Alba da Silva --- Postgraduate Program of Forestry Engineering, Department of Forest Engineering, Brazil Lucas Dalmolin Ciarnoschi --- Postgraduate Program of Forestry Engineering, Department of Forest Engineering, BrazilThis study evaluated the efficiency of taper functions and the application of mixed-effect modelling for diameter estimation along the stems of Tectona grandis. We sampled 266 trees of Tectona grandis, measuring the diameter at relative heights for volume determination, grouping... -
Prediction of overt aggression experienced by college students
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Chris Myburgh --- Department of Educational Psychology and Nursing Science, South Africa Marie Poggenpoel --- Department of Educational Psychology and Nursing Science, South Africa Cornelius Fourie --- Department of Educational Psychology and Nursing Science, South AfricaWe sought to predict overt aggression among college students from their intra- and interpersonal relationships self-perceptions. Respondents were 311 students (females = 69.8%; black = 65.9%, white = 16.7%; mean age = 26.38 years, SD = 9.57 years) from a... -
A panel-data analysis of the explanatory power of factor premiums on the Johannesburg Stock Exchange (JSE)
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Daniel Page --- Finance Division, School of Economic & Business Sciences, South Africa Christo Auret --- Finance Division, School of Economic & Business Sciences, South AfricaA large portion of South African asset pricing literature considers the identification of investment styles present on the Johannesburg Stock Exchange (JSE). Unfortunately, the identification of an ‘investment style’ does not necessarily entail that the said style is an ‘explanatory... -
Functional Diversity and Performance of Direct Marketing Outlets for Smallholder Farmers of Green Gram and Pigeon Pea Commodities in Machakos County, Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: John Mulwa Wambua --- Department of Agricultural Economics and Agribusiness, Kenya Margaret Ngigi --- Department of Agricultural Economics and Agribusiness, Kenya Lutta Muhammad --- Kenya Agricultural and Livestock Research Organization, KenyaThe smallholder direct marketing outlets (private grain traders) serve the smallholder farmers poorly in the rural areas of Kenya, making local markets thin and less competitive. The purpose of this study is to evaluate the diversity and the determinant factors... -
On the financial interpretation of risk contributions: An analysis using Quantile Simulation
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Simon du Plooy --- Centre for Business Mathematics and Informatics, Faculty of Natural Sciences, South AfricaThis paper tests whether the financial interpretation of risk contributions (Qian, 2006), as measured by marginal change in volatility, holds when accounting for fat tails in the asset return distributions. This important result is the theoretical foundation of risk-based portfolios,... -
Comparative methods for predicting cyanide pollution in artisanal small-scale gold mining catchment by using logistic regression and kriging with GIS
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: L. C. Razanamahandry --- International Institute for Water and Environmental Engineering (2iE), Department of Water and Sanitary Engineering, Laboratory of Water, Burkina Faso P. M. Digbeu --- International Institute for Water and Environmental Engineering (2iE), Department of Water and Sanitary Engineering, Laboratory of Water, Burkina Faso H. A. Andrianisa --- International Institute for Water and Environmental Engineering (2iE), Department of Water and Sanitary Engineering, Laboratory of Water, Burkina Faso H. Karoui --- International Institute for Water and Environmental Engineering (2iE), Department of Water and Sanitary Engineering, Laboratory of Water, Burkina Faso J. Podgorski --- Swiss Federal Institute of Aquatic Science and Technology (EAWAG), Switzerland E. Manikandan --- UNESCO-UNISA Africa Chair in Nanoscience’s/Nanotechnology Laboratories (U2AC2N), College of Graduate Studies, South Africa M. Maaza --- UNESCO-UNISA Africa Chair in Nanoscience’s/Nanotechnology Laboratories (U2AC2N), College of Graduate Studies, South Africa H. Yacouba --- International Institute for Water and Environmental Engineering (2iE), Department of Water and Sanitary Engineering, Laboratory of Water, Burkina FasoIt has been reported that persistent cyanide pollution occurs in artisanal small-scale gold mining (ASGM) catchment areas in Burkina Faso. In the present study, logistic regression (LR) and Regression Kriging (RK) methods were applied to predict cyanide pollution hazard at... -
Food security status and its determinants in pastoral and agro-pastoral districts of Afar regional state, Ethiopia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Shishay Teklay Kahsay --- , Ethiopia Gebrehaweria Kidane Reda --- , Ethiopia Alem Mezgebo Hailu --- , EthiopiaFood insecurity is a prime difficulty in Ethiopia. Food security policies and intervention mechanisms require empirical evidence on factors related to enhancement of food security. This study analyzed the determinants of households’ food security status in pastoral and agro-pastoral districts... -
Improving the forecasts of commercial timber volume in transition forest in the northern Brazilian Amazon
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Robson B de Lima --- , Brazil Rinaldo LC Ferreira --- , Brazil José AA da Silva --- , Brazil Marcelino C Guedes --- , Brazil Jadson C de Abreu --- , Brazil Cinthia P de Oliveira --- , Brazil Robson C Lima --- , Brazil Diego AS da Silva --- , Brazil Renan M Santos --- , Brazil Erik PF Carvalho --- , Brazil Robson M de Araújo Silva --- , BrazilThe commercial volume in tropical forests is fundamental to the implementation of sustainable forest management plans. However, in the absence of local or generic volumetric equations, most forest managers and forest services are still using traditional form factors (FF) to... -
Longitudinal species turnover rates are predictable and should guide location of sampling sites for South African river surveys to assess aquatic biodiversity
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NA Rivers-Moore --- , South Africa FC de Moor --- , South AfricaRepresentative samples of biota collected relative to environmental gradients are important for measuring present distributions and predicting shifts in distribution of taxa in response to climate change or reduced river connectivity. Based on river ecology theory and established measures of... -
Adoption and impacts of improved beehive technologies in the miombo woodland of Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Nicholaus Musimu Kuboja --- , Tanzania A.C. Isinika --- , Tanzania F.T.M. Kilima --- , TanzaniaThis paper analyzes the adoption and impacts of improved beehives on households’ income using cross-sectional data sourced from a sample of 198 beekeepers in western Tanzania who adopted improved beehives. Propensity score matching and the endogenous switching regression model are... -
Machine learning and regression models to predict multiple tree stem volumes for teak
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ivaldo da Silva Tavares Júnior --- , Brazil Jianne Rafaela Mazzini de Souza --- , Brazil Lucas Sérgio de Sousa Lopes --- , Brazil Leonardo Pereira Fardin --- , Brazil Gianmarco Goycochea Casas --- , Brazil Ricardo Rodrigues de Oliveira Neto --- , Brazil Rodrigo Vieira Leite --- , Brazil Helio Garcia Leite --- , BrazilThe quantification of a stand’s wood stock is one of the most important procedures for Tectona spp. (teak) management. An optimal method for estimating tree volume must accommodate the variation of the data collected in the inventory. This study evaluated... -
Business organisation performance behaviour indicators in Ghana and Kenya: A comparative analysis
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Solomon Abugre Anafo --- , China Yixiang Tian --- , China Bright Nana Kwame Ahia --- , ChinaWe examined business organisation performance indicators across two African countries (Ghana and Kenya) with diverse and volatile economic variables. Utilising secondary data from 2007 to 2017, we applied fixed-effect panel regression to predict profitability indicators from business operations. Our findings... -
Factors associated with HIV testing among youth in a generalised hyperendemic setting: findings from a national survey in Eswatini
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Maswati S Simelane --- , Eswatini Garikayi B Chemhaka --- , Eswatini Mduduzi Colani Shongwe --- , Eswatini Mfundi PS Motsa --- , Taiwan Lindelwa P Dlamini --- , TaiwanAim: Even though Eswatini was the first country in Africa to achieve the UNAIDS 95-95-95 targets among people living with HIV nationally, youth aged 15–24 years lag behind in HIV testing. This study determined the overall prevalence of HIV testing... -
Adoption of organic fertilizer for cocoa production in Ghana: Perceptions and determinants
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Anthoinette Avane --- , Ghana Bismark Amfo --- , Ghana Robert Aidoo --- , Ghana James Osei Mensah --- , GhanaThis study assesses perceptions, determinants, and constraints of ‘Asaasenufosuo’ organic fertilizer adoption by cocoa farmers in Ghana. Primary data were sourced from 200 cocoa farmers. Perception index, Cragg’s double hurdle model, and Kendall’s coefficient of concordance were employed. In addition... -
The effects of economic policy uncertainty on the US REITs ETFs: A quantile analysis
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Husni Charif --- , Lebanon Ata Assaf --- , Lebanon Ender Demir --- , Iceland Khaled Mokni --- , Saudi ArabiaThis paper investigates the impact of economic policy uncertainty (EPU) on real estate investment trusts (REITs) ETFs in a quantile-based framework by employing the nonparametric causality test and the quantile autoregressive (QAR) model. Using data covering the returns of eight... -
Determinants of the adoption of green manufacturing practices by medium- and large-scale manufacturing industries in northern Ethiopia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Adino Andaregie --- , Ethiopia Tessema Astatkie --- , CanadaThe barriers to and opportunities for adopting green manufacturing practices (GMP) have not been well investigated in Ethiopian manufacturing industries. The objectives of this study were to identify the potential barriers to and determinants of adopting GMP among medium- and... -
Indicators of firm growth: Evidence from the JSE
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Kyle Kildaire --- University of the Witwatersrand, South Africa Avani Sebastian --- University of the Witwatersrand, South Africa Warren Maroun --- University of the Witwatersrand, South AfricaThe estimation of firm growth is increasingly relevant to providers of capital in periods of economic uncertainty. The current study employs univariate and multivariate analyses to assess the impact of real GDP and the dividend payout ratio on earnings growth... -
Nexus between perceptions of urban environmental planning and solid waste management practices in Debre Markos Town, Amhara Region, Northwest Ethiopia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Genet Barklign --- University of Gondar, Ethiopia Kassahun Gashu --- University of Gondar, EthiopiaLack of integration between urban environmental planning and solid waste management is a challenge for cities in developing countries. The aim of the research was to analyze the nexus between local communities’ perceptions of urban environmental planning and solid waste... -
Perception and adoption of artificial pollination technology in cocoa production: Evidence from Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Camillus Abawiera Wongnaa --- , Ghana Afrane Baffour Kyei --- , Ghana Isaac Akurugu Apike --- , Ghana Dadson Awunyo-Vitor --- , Ghana Raymond K. Dziwornu --- , GhanaThis study examined the perception and adoption of artificial pollination among cocoa farmers in Ghana. It used cross-sectional data collected from 206 cocoa farmers selected through multi-stage sampling technique. Descriptive statistics, Likert Scale and the Tobit regression model were the... -
Smallholder vegetable farmers’ commercialization to enhance rural livelihoods in the Eastern Cape province, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Lelethu Mdoda --- , South Africa Mzuyanda Christian --- , South AfricaThis study aims at establishing how vegetables can be commercialized to improve rural livelihoods in the Eastern Cape province of South Africa. A structured questionnaire was used to obtain primary data from 120 multi-purposive selected smallholder vegetable farmers. Descriptive statistics,... -
Determinants of extramarital sex by men in Tanzania: A case study of Mbeya region
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Maurice CY Mbago --- Department of Statistics and Member of the Demographic Training Unit, University of Dar es Salaam, Tanzania Francis J Sichona --- Department of Statistics and Member of the Demographic Training Unit, University of Dar es Salaam, TanzaniaThis paper attempts to identify some factors associated with extramarital sex by men in the Mbeya region of Tanzania using data from a survey conducted in 2003/2004. The choice of Mbeya region was prompted by the fact that it has... -
Risk factors associated with HIV infection among young persons aged 15–24 years: Evidence from an in-depth analysis of the 2005–06 Zimbabwe Demographic and Health Survey
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Joshua Kembo [d118e18]This study focuses on factors that predispose young persons aged 15–24 years in Zimbabwe to infection from HIV. Using the Mosley and Chen framework, multivariate modelling was used to assess the effect of demographic, socio-economic and behavioural factors on the... -
A weighted bootstrap approach to logistic regression modelling in identifying risk behaviours associated with sexual activity
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Humphrey Brydon --- , , South Africa Rénette Blignaut --- , , South Africa Joachim Jacobs --- , , South AfricaThe latest population estimates released by Statistics South Africa indicate that 25.03% of all deaths in 2017 in South Africa were AIDS-related. Along with these results, it is also reported that 7.06% of the population were living with HIV, with... -
Relationship between socio-economic characteristics of older adults’ women and family planning use in Botswana
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Njoku Ola Ama --- Department of Statistics, University of Botswana, Botswana John O. Olaomi --- Department of Statistics, University of South Africa,Older adults (50 years and over) are still sexually active and therefore vulnerable to unplanned pregnancy, infection of STIs and HIV, yet there are no programmes in place to cater for their family planning needs. The objective of the study... -
Predicting soil carbon in granitic soils using Fourier-transform mid-infrared (FT-MIR) spectroscopy: the value of database disaggregation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Kelebohile Rose Seboko --- University of the Free State, South Africa Johan van Tol --- University of the Free State, South Africa Elmarie Kotze --- University of the Free State, South AfricaSoil carbon (C) is an important component in quality assessments and efficient models are required to estimate C rapidly. Accurate C assessments are valuable in monitoring land-use changes. Fourier-transform mid-infrared (FT-MIR) spectroscopy has proved to be a powerful tool for... -
Tropical wood species: alternative model to determine the characteristic compressive strength perpendicular to grain
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Arthur Filipe Freire Gomes --- Federal University of São Carlos (UFSCar), Brazil Fernando Júnior Resende Macarenhas --- Rua Luís Reis Santos - Pólo II, University of Coimbra, Portugal Diego Henrique de Almeida --- Federal University of São Carlos (UFSCar), Brazil Alfredo Manuel Pereira Geraldes Dias --- Rua Luís Reis Santos - Pólo II, University of Coimbra, Portugal Tulio Hallak Panzera --- Federal University of São João Del Rey (UFSJ), Brazil Francisco Antônio Rocco Lahr --- University of São Paulo (USP), Brazil André Luis Christoforo --- Federal University of São Carlos (UFSCar), BrazilBrazil has a vast area of native forests with the potential to be sustainably exploited for application in civil construction. Density is a key factor when analysing the characteristics of different wood species and their future uses, and additionally it... -
A quantile-based analysis of risk-return dynamics in the South African equity market
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Munyaradzi Chawana --- , South Africa Ilse Botha --- School of Accounting, College of Business and Economics, University of Johannesburg, South Africa Yolanda Stander --- Investec, Senior research associate at University of Johannesburg, South AfricaThis paper employs quantile autoregression to investigate the influence of ‘market size’ and ‘industry’ effects on the South African equity market volatility response to return shocks. It is now well documented that equity market volatility exhibits asymmetric response to positive... -
Predictive modelling to determine the attainable moisture content of Alstonia boonei wood using a solar kiln dryer
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Joy Aduralere Ogunsuyi --- Federal University of Technology Akure (FUTA), Nigeria Jacob Mayowa Owoyemi --- Federal University of Technology Akure (FUTA), Nigeria Olusola Samuel Makinde --- Federal University of Technology Akure (FUTA), NigeriaModelling of wood drying is important for predicting the performance and efficiency of solar dryers and to optimise the drying process during each season of the year. The attainable moisture content (MC) of Alstonia boonei wood was studied when dried... -
PrEP retention predictors among key populations in urban areas of Zimbabwe — a machine learning approach
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Bridgette Bero --- National University of Science and Technology, Zimbabwe Chipo Zidana --- Botswana International University of Science and Technology, Botswana Sarudzai Portia Showa --- National University of Science and Technology, ZimbabwePre-exposure prophylaxis (PrEP) success depends on adherence and hence retention in care. It is vital to find factors that affect PrEP retention to make this HIV-prevention method successful. The main objectives of this study were to identify the major determinants... -
The influence of type of sexual partnership on male condom use: empirical evidence from the South African construction industry
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Kamal Yakubu --- University of Cape Town, South Africa Paul Bowen --- University of Cape Town, South Africa Rajen Govender --- University of Cape Town, South AfricaThere are indications that gender has an effect on individual risk factors and pathways to HIV diagnoses and treatment. Furthermore, there is growing recognition that to improve HIV-related health outcomes for men, it is important to understand their experiences and... -
Farmers’ choices and factors driving adoption of climate change adaptation strategies in saline coastal area of Bangladesh
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mst. Esmat Ara Begum --- Bangladesh Agricultural Research Institute, Bangladesh Md. Abdur Rashid --- Bangladesh Agricultural Research Institute, Bangladesh Mohammad Ismail Hossain --- Bangladesh Agricultural University, Bangladesh Md. Anower Hossain --- Bangladesh Agricultural Research Institute, Bangladesh Md. Harunor Rashid --- Bangladesh Agricultural Research Institute, Bangladesh Mustafa Kamal Shahadat --- Bangladesh Agricultural Research Institute, Bangladesh Mohammed Mainuddin --- Water Security Program, CSIRO Environment, AustraliaGrowing climate change adaptation issues are driving the demand for efficient solutions in the agriculture sector, which will improve farmers’ livelihoods and economic situations. This study examined the perceptions of major climate risks and factors driving adoption of climate adaptation... -
Does participation in innovation platform improve welfare? Insights from smallholder maize farmers in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Eric Asiamah Yeboah --- , Ghana Kelvin Balcombe --- University of Reading, UK Bright Owusu Asante --- Kwame Nkrumah University of Science and Technology (KNUST), Ghana Stephen Prah --- Kwame Nkrumah University of Science and Technology (KNUST), Ghana Robert Aidoo --- Kwame Nkrumah University of Science and Technology (KNUST), GhanaThis paper investigates the impact of participation in innovation platforms (IPs) on smallholder maize farmers’ welfare in the Brong Ahafo region of Ghana using data collected from 477 rural farm households. We employed the doubly robust inverse probability weighted regression... -
Quantile dependencies between exchange rate volatility and sectoral stock returns in South Africa
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Darren Mubaiwa --- University of the Witwatersrand, South Africa Ismail Fasanya --- University of the Witwatersrand, South AfricaThis study assesses the effect of USD-Rand exchange rate volatility on South African sectoral stock returns between 29 March 1996 and 28 July 2022. Using the quantile-on-quantile regression (QQR) technique, we uncover that, although each of the sectors exhibit important... -
Cayley regression problem of some groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Q. Liao --- Guangdong University of Education, P.R. China W. Liu --- Central South University, P.R. China J. Tang --- Hunan First Normal University, P.R. ChinaIn this paper, we consider the Cayley regression problem of the cyclic groups and the dihedral groups. We give the sufficient and necessary conditions for the cyclic group ℤ n to be a Cayley regression. Moreover, the dihedral group D... -
Determinants of nutrition security status of women in rural households in Northwest Ethiopia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Fentaw Teshome --- Injibara University, Ethiopia Adino Andaregie --- Soka University, Japan Tess Astatkie --- Dalhousie University, CanadaThe nutrition security of women is critically important for society’s well-being. Therefore, this study was conducted to determine the determinants of the nutrition security status of rural women in Northwest Ethiopia. Data collected from rural women in 197 randomly selected... -
Identification of factors influencing electricity consumption in Yaoundé City, Cameroon
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Léonce Tokam --- University of Lomé, Togo Sanoussi S. Ouro-Djobo --- University of Lomé, TogoThis study explores the factors influencing household electricity consumption in Yaoundé, Cameroon, where energy poverty, frequent power cuts and high tariffs pose major challenges to ensuring reliable, affordable and permanent access to electricity for populations, given the energy potential the... -
Dietary behaviour among adults in Northern Ghana: a polytomous logistic regression model approach
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Kwame Opare-Asamoah --- University for Development Studies, Ghana Daniel Edem Kpewou --- University for Development Studies, Ghana Jerry Xola Sosu --- University for Development Studies, Ghana Vicentia Esinam Degbey --- University for Development Studies, Ghana Ezekiel Kofi Vicar --- University for Development Studies, Ghana Julius T Dongdem --- University for Development Studies, Ghana Saeed F. Majeed --- University for Development Studies, Ghana Kwadwo Fosu Antwi --- University for Development Studies, GhanaObjectives: This study determined the predictors of dietary behaviour among adults living in an urban and rural location in northern Ghana. -
Population growth of Daphnia magna cultured in manure-fertilised water under laboratory conditions
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Adamneh Dagne --- Ethiopian Institute of Agricultural Research (EIAR), National Fishery and other Aquatic Life Research Center, Ethiopia Getacher Beyene --- Ethiopian Institute of Agricultural Research (EIAR), National Fishery and other Aquatic Life Research Center, Ethiopia Alemayehu Wubie --- Ethiopian Institute of Agricultural Research (EIAR), National Fishery and other Aquatic Life Research Center, EthiopiaIn developing countries, mass production of Daphnia magna, used as a food in freshwater aquaculture, is a challenge. A fifteen-day laboratory experiment was conducted to examine the population growth and reproductive parameters for D. magna reared in green water fertilised... -
Species-specific wood volume growth models outperform unified model across eucalypt species
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Emanuel Ferrari do Nascimento --- Universidade Federal de Viçosa (UFV), Brazil João Amaro Ferreira Vieira Netto --- Universidade Federal de Viçosa (UFV), Brazil Marco Antônio Peixoto --- University of Florida, USA Larissa Pereira Ribeiro Teodoro --- Universidade Federal do Mato Grosso do Sul (UFMS), Brazil Paulo Eduardo Teodoro --- Universidade Federal do Mato Grosso do Sul (UFMS), Brazil Leonardo Lopes Bhering --- Universidade Federal de Viçosa (UFV), BrazilForest ecosystems play an essential role in maintaining biodiversity and mitigating global warming. Intensively managed forest plantations represent a major raw material source for pulp, timber and paper industries. The objective of this study was to apply the model identity... -
Prediction of ambient air pollution with regression approach using machine learning
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Bachandeep Singh Bhathal --- University Institute of Computing, Chandigarh University, India Gaurav Gupta --- Punjabi University, India Brahmaleen Kaur Sidhu --- Punjabi University, IndiaAccurate air quality prediction is vital for managing pollution and protecting public health. This study evaluates the performance of three machine learning models – Decision Tree Regression (DTR), Linear Regression (LR), and Random Forest Regression (RFR) – to forecast the... -
An estimation of liquidity effects of market microstructure changes in the Indian agricultural commodity market
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Sreekha Pullaykkodi --- Manipal School of Commerce and Economics, Manipal Academy of Higher Education, IndiaThe effects of market microstructure change on the liquidity of the Indian agricultural commodity market are examined using 18 years of data by dividing it into different sub-samples. The study examines variations in market liquidity by conducting a year-wise analysis,...
