Search
Search results for
We found
58 results for you
-
Effect of exchangeable sodium and phosphogypsum on the hydraulic properties of several South African soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.M. du Plessis --- , I. Shainberg --- ,The susceptibility of soils to the deleterious effects of sodicity was assessed for samples which varied with respect to physical, mineralogical and other properties. For this purpose soil samples were collected from different locations in South Africa. The effect of... -
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... -
'n Evaluering van die volumetermetode om aggregaatstabiliteit van 'n vertisol te kwantifiseer
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Beukes --- Departement van Landbou en Watervoorsiening, Republiek van Suid-AfrikaDie 0–10 mm laag van twee proefpersele van 'n vertiese grond waarop graansorghum sonder enige bewerking met behoud van 'n stoppeldeklaag (GBS) en met die Stoppel verwyder (GBG), verbou is, is gemonster. Grond- koolstofinhoud was 1,82% en 1,15% onderskeidelik. Massas... -
Correlation between micro-aggregate stability and soil surface susceptibility to runoff and erosion
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R. Stern --- , Republic of South Africa B.E. Eisenberg --- Department of Agriculture, Republic of South Africa M.C. Laker --- Department of Soil Science and Plant Nutrition, Republic of South AfricaA simple procedure to determine micro-aggregate stability was developed. The micro-aggregates in aqueous suspension were subjected to controlled energy input imposed by sonic vibration to simulate the breaking down of aggregates by raindrop impact during a rain storm event. The... -
Polymer effect on infiltration and erosion of sodic soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Gal --- , Republic of South Africa R. Stern --- , Republic of South Africa J. Levin --- , Republic of South Africa M. Ben-Hur --- , Republic of South AfricaRunoff from irrigated sodic soils is a common phenomenon in arid and semi-arid climates. The effect of a low-charge polysaccharide (LCCP) on infiltration rate (IR) and runoff on two red apedal soils was studied using an irrigation simulator. One was... -
Protein synthesis during osmotic stress in maize
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.R. Woodward --- , Republic of South Africa A. van der Mescht --- , Republic of South AfricaAn experiment measuring cell membrane stability was conducted on different inbred lines of maize with known drought sensitivity or tolerance. SDS-polyacrylamide gel electrophoresis showed that a 29.5 kD polypeptide was newly synthesized in the drought sensitive inbred line F2834T in... -
Soil properties as influenced by cultivation of the aromatic shrub Artemisia afra
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.H. Hansen-Quartey --- Department of Agronomy, Republic of South Africa S.A. Materechera --- School of Agriculture, Republic of South Africa K. Nyamapfene --- , Republic of South AfricaThe herbaceous aromatic shrub African wormwood (Artemisia afra) is thought to be indigenous to the Eastern Cape region of South Africa. In the natural environment, wherever the plant grows, patches of hard, bare ground develop around the plant. To investigate... -
Genotype × environment interaction of winter wheat (Triticum aestivum L.) in South Africa: II. Stability analysis of yield performance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.L. Purchase --- , Republic of South Africa Hesta Hatting --- , Republic of South Africa C.S. van Deventer --- Department of Plant Breeding, Republic of South AfricaThirteen winter and intermediate type bread wheat cultivars were evaluated for yield stability under dryland conditions over a four year period from 1991 to 1994 and over a total of 120 environments in the Western, Central and Eastern Free State... -
Productivity and stability of grain yield in maize and sorghum as affected by rotational cropping systems in the north western Free State
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.L. Loubser --- , Republic of South Africa A.A. Nel --- , Republic of South AfricaThe beneficial effects of crop rotation have long been researched and recognised in the world. Research results on crop rotation in South Africa are limited. The objective of this study was to determine the effect of crop rotation with groundnut,... -
Genotype-environment interactions and yield stability analyses of maize in Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. Abera --- Department of Plant Sciences, South Africa J. B.J. van Rensburg --- Department of Plant Sciences, South Africa M.T. Labuschagne --- Department of Plant Sciences, South Africa H. Maartens --- Department of Plant Sciences, South AfricaThe objective of this study was to evaluate the adaptation of 10 maize genotypes across five locations and three years in Ethiopia. Grain yield of 10 maize genotypes, tested in a randomised block design with four replications across the named... -
Stability analysis of grain yield of tef (Eragrostis tef) using the mixed model approach
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.D. Kassa --- Discipline of Statistics & Operations Research, Republic of South Africa MarieF. Smith --- Biometry Unit, Republic of South Africa H. Fufa --- , EthiopiaMulti-environment trials are usually used to assess the grain yield stability of genotypes. Most of the common stability measures such as Finlay and Wilkinson (1963), Eberhart and Russell (1966) and Shukla (1972), can be accommodated by a linear mixed model... -
Stability analysis of kernel and milling characteristics in winter and facultative wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: U. Aucamp --- Department of Plant Sciences, South Africa M.T. Labuschagne --- Department of Plant Sciences, South Africa C.S. van Deventer --- Department of Plant Sciences, South AfricaConsistency in quality of wheat grain and flour over seasons is critical to the manufacture of high quality products. The aim of this study was to measure the stability of kernel and milling quality characteristics. Thirteen hard red winter and... -
The effect of hydroxide solutions on the structural stability and saturated hydraulic conductivity of four tropical soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Nyamangara --- Department of Soil Science and Agricultural Engineering, Zimbabwe S. Munotengwa --- Department of Soil Science and Agricultural Engineering, Zimbabwe P. Nyamugafata --- Department of Soil Science and Agricultural Engineering, Zimbabwe G. Nyamadzawo --- Department of Soil Science and Agricultural Engineering, ZimbabweIndustrial and domestic effluents are widely applied to soil as a way of dumping, and/or source of nutrients and water for plant growth. The potential effects of sodium hydroxide (NaOH) and potassium hydroxide (KOH), which are common hydroxides found in... -
A review of advances in hydropedology for application in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.W. van Huyssteen --- , South AfricaHydropedology is internationally a new and fast-growing science. It is therefore pertinent to take heed of developments in this regard to guide current and future research in South Africa. This paper aims to discuss the initiation and advances in the... -
MODELS OF ECOSYSTEMS AND AQUATIC ENVIRONMENTS: DEVELOPMENT AND APPLICATION
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.R. Allanson --- , South AfricaAn historical treatment of a number of principal events is given. This leads to an assessment of the current research approach in hydrobiology and its success in the development of process orientated ecosystem component models. With the contemporaneous development of... -
Research note: The silage characteristics of two varieties of forage sorghum mixed in different proportions and at two stages of maturity
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G. Ashbell --- Forage Preservation and By‐Products Research Unit, ARO, Israel Z.G. Weinberg --- Forage Preservation and By‐Products Research Unit, ARO, Israel K.K. Bolsen --- Department of Animal Sciences and Industry, United States Y. Hen --- Forage Preservation and By‐Products Research Unit, ARO, Israel A. Azrieli --- Forage Preservation and By‐Products Research Unit, ARO, IsraelTwo varieties of forage sorghum, low grain Dekalb FS‐5 (FS) and higher grain Pioneer 947 (GS) were harvested at the milk and dough stages of maturity respectively. Each variety was ensiled separately and as mixtures under laboratory conditions. The mixtures... -
Validating Measures of Psychological Well-being by Contrasting Samples Employed in Hazardous and Less Hazardous Work
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Deo J. W. Strümpfer --- University of Johannesburg, South Africa Riëtte J. Eiselen --- University of Johannesburg, South Africa Deon Meiring --- University of Pretoria, Jack S. Phalatse --- SASOL Mining,The study investigated whether differences between contrasting groups reflect significant differences in psychological well-being scores. Membership of hazardous vs. less hazardous occupations in the same profession served as proxy measures of well-being. Antonovsky's Sense of Coherence (SOC), Block & Kremen's... -
Psychosocial Effects of Conditions of Military Deployment
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Charles Makatipe Kgosana --- University of Stellenbosch, South Africa Gideon Van Dyk --- University of Stellenbosch, South AfricaDeployment may lead the soldiers to dichotomise their profession and their family life, resulting in unwanted effects on family or career. Effects on reintegration and functioning within family are considered. Reunions may be characterized by perceived negative reception and consequences... -
Hydraulic loading, stability and water quality of Nakivubo wetland, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J Kyambadde F Kansiime L Gumaelius G DalhammarNakivubo wetland, which has performed tertiary water treatment for Kampala city for the past 40 years, is ecologically stressed by agricultural and infrastructural developments. Field studies were carried out to assess the hydraulic loading, pollution profile, stability and water quality... -
MODELS OF ECOSYSTEMS AND AQUATIC ENVIRONMENTS: DEVELOPMENT AND APPLICATION
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: B.R. Allanson --- , South AfricaAn historical treatment of a number of principal events is given. This leads to an assessment of the current research approach in hydrobiology and its success in the development of process orientated ecosystem component models. With the contemporaneous development of... -
South Africa's coastal-breeding white-breasted cormorants: population trends, breeding season and movements, and diet
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RJM Crawford --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa RM Randall --- South African National Parks, South Africa PA Whittington --- East London Museum, South Africa L Waller --- CapeNature, South Africa BM Dyer --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa DG Allan --- Durban Natural Science Museum, South Africa C Fox --- Ezemvelo-KZN Wildlife, South Africa AP Martin --- Department of Zoology, South Africa L Upfold --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa J Visagie --- CapeNature, South Africa S Bachoo --- Ezemvelo KZN Wildlife, South Africa M Bowker --- School of Life Sciences, South Africa CT Downs --- School of Life Sciences, South Africa R Fox --- Addo Elephant National Park, South African National Parks, South Africa J Huisamen --- CapeNature, South Africa AB Makhado --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa WH Oosthuizen --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa PG Ryan --- Percy FitzPatrick Institute of African Ornithology, South Africa RH Taylor --- School of Life Sciences, South Africa JK Turpie --- Anchor Environmental Consultants, South AfricaWhite-breasted cormorants Phalacrocorax [carbo] lucidus breed around South Africa's coast and at inland localities. Along the coasts of the Northern, Western and Eastern Cape provinces, numbers breeding were similar during the periods 1977–1981 (1 116 pairs at 41 localities) and... -
Stand stability in pines : An important silvicultural criterion for the evaluation of thinnings and the development of thinning regimes
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: W.H.F. Hinze --- SAFCOL Research and Development, N.O. Wessels --- ,This article deals with the role played by the stability factor (SF) in the evaluation ofthinnings in fastgrowing, even-aged pine stands. It also illustrates how the stability factor is influenced by thinnings and site over time. The SF is expressed... -
Genotype × environment interactions and yield stability of stress-tolerant open-pollinated maize varieties in the Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Vimbayi GP Chimonyo --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Charles S Mutengwa --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Cornelius Chiduza --- Department of Agronomy, Faculty of Science and Agriculture, South AfricaGenotype × environment interactions are inherent in multilocational trials and complicate identification of superior genotypes. The aim of the study was to determine yield performance and stability of 13 maize genotypes in five locations of the Eastern Cape province, South... -
Haemodynamic and anaesthetic advantages of dexmedetomidine
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: SH Rao --- Department of Anaesthesia and Critical Care, India B Sudhakar --- Department of Anaesthesia and Critical Care, India PK Subramanyam --- Department of Anaesthesia and Critical Care, IndiaObjectives: The aim of this study was to describe the effect of dexmedetomidine on haemodynamic stability in the intraoperative period, as well as on the pressor response to intubation and extubation and the requirement of inhalation anaesthetics and recovery. -
Some evidence on the stability of beta coefficients on the JSE
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: D C Bowie --- Quantitative Consultant at The WM Company, Scotland D J Bradfield --- Department of Statistical Sciences,Knowledge of beta stability is crucial for projections involving the use of beta coefficients, in particular, in the areas of project evaluation and portfolio design. This paper investigates the issue of beta stability on the JSE. The investigation reveals how... -
Estimation of stability-related soil properties using mid-infrared spectroscopy for non-agricultural land use in Lake Victoria basin, Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: B. K. Waruru --- Kenya Agricultural and Livestock Research Organization (KALRO), Kenya K. D. Shepherd --- World Agroforestry Centre (ICRAF), Kenya G. M. Ndegwa --- Jomo Kenyatta University of Agriculture and Technology (JKUAT), Kenya A. Sila --- World Agroforestry Centre (ICRAF), Kenya P. T. Kamoni --- Kenya Agricultural and Livestock Research Organization (KALRO), KenyaMethods for rapid and accurate soil tests are needed for stability-related soil properties, which are valuable for non-agricultural land use. The study tested the applicability of mid-infrared (MIR) spectroscopy for rapid estimation of selected stability-related soil properties. Two sample sets,... -
Physical crust formation and steady-state infiltration rate in soils dominated by primary minerals in some South African ecotopes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Adornis D Nciizah --- Department of Agronomy, South Africa Isaiah IC Wakindiki --- Department of Agronomy, South AfricaPhysical crust formation is affected by the inherent soil properties such as texture and mineralogy. However, inconsistencies exist in soil mineralogy effects of soil crusting. In addition, investigations of soils dominated by primary minerals such as quartz, especially in South... -
Tillage and crop rotation effects on carbon sequestration and aggregate stability in two contrasting soils at the Zanyokwe Irrigation Scheme, Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Arnold N Njaimwe --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Pearson NS Mnkeni --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Cornelius Chiduza --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Pardon Muchaonyerwa --- School of Agricultural, Earth and Environmental Sciences, South Africa Isaiah IC Wakindiki --- Department of Agronomy, Faculty of Science and Agriculture, South AfricaIntensive tillage and monocropping have adversely affected the quality of soils in South Africa through accelerated loss of soil organic matter. Two clay loam soils, a Bonheim at Burnshill and a Shortlands at Lenye, at the Zanyokwe Irrigation Scheme in... -
A stability optimization model for shaft rotor-bearing systems
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Chiemela Onunka --- Discipline of Mechanical Engineering, South Africa Herbert A. Grobler --- Discipline of Mechanical Engineering, South Africa Glen Bright --- Discipline of Mechanical Engineering, South AfricaThe paper presents the modelling of unbalance in a shaft rotor-bearing system using energy methods and finite element analysis strategies. The modelling process brought about the review of three types of unbalance in the shaft rotor-bearing system. They include mass... -
Effect of soluble dietary fibres from Bambara groundnut varieties on the stability of orange oil beverage emulsion
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Yvonne Maphosa --- Department of Food Technology, South Africa Victoria A. Jideani --- Department of Food Technology, South Africa Oladayo Adeyi --- Department of Chemical Engineering, South AfricaSoluble dietary fibres (SDFs) [30% (w/w)] from four varieties of Bambara groundnut (BGN), viz. black-eye, brown-eye, brown and red were used to stabilize orange oil beverage emulsions at 6% (w/w) orange oil. Emulsion stability was studied using Turbiscan MA 2000... -
Maturity, protein content and yield stability of cowpea in Uganda
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Gabriel Ddamulira --- National Crops Resources Research Institute, Uganda Carlos AF Santos --- Embrapa Semi-Arid, Brazil Mildred Alanyo --- National Crops Resources Research Institute, Uganda Idd Ramathani --- National Crops Resources Research Institute, Uganda Mcebisi Maphosa --- Department of Crop and Soil Sciences, ZimbabweLow yields and protein content are major constraints to cowpea production in semi-arid areas. A study was conducted to determine cowpea performance across diverse environments in Uganda. Twenty-eight cowpea genotypes were evaluated in a randomised complete block design with three... -
Overview and status of estuarine microphytobenthos ecological research in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Dalu --- Department of Ecology and Resource Management, South Africa JB Adams --- Department of Botany, South Africa JC Taylor --- South African Institute for Aquatic Biodiversity, South Africa GC Bate --- Department of Botany, South Africa M Nunes --- Department of Botany, South Africa PW Froneman --- Department of Ecology and Resource Management, South Africa RJ Wasserman --- South African Institute for Aquatic Biodiversity, South AfricaThis article presents a historical overview of estuarine microphytobenthos (MPB) research in South Africa published over the period 1950 to the present, highlighting major milestones, challenges and estuarine management problems, as well as future research needs within the South African... -
Non-invasive assessment of adrenocortical activity as a measure of stress in leopards Panthera pardus
Item type: Journal Article • Journal: African Zoology • Authors: Andrea B Webster --- Endocrine Research Laboratory, Department of Anatomy and Physiology, South Africa Richard EJ Burroughs --- Department of Production Animal Studies. Faculty of Veterinary Science, South Africa Peter Laver --- Endocrine Research Laboratory, Department of Anatomy and Physiology, South Africa André Ganswindt --- Endocrine Research Laboratory, Department of Anatomy and Physiology, South AfricaLeopards Panthera pardus are classified in the IUCN Red List as Vulnerable, primarily due to habitat loss, natural prey base depletion and exploitation caused by various anthropogenic activities. Although protected areas are important for leopard conservation, the majority of suitable... -
A novel approach for the identification of critical nodes and transmission lines for mitigating voltage instability in power networks
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Akintunde Samson Alayande --- Department of Electrical and Electronic Engineering Science, South Africa Nnamdi Nwulu --- Department of Electrical and Electronic Engineering Science, South AfricaVoltage collapse is a major issue combating the effectiveness and optimal operation of modern power systems in recent times. This is a great threat to the security and reliability of modern power systems and, in recent times, it has been... -
Genotype-by-environment interaction and yield stability of sunflower hybrids across production environments in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Safiah Ma’ali --- Agricultural Research Council–Grain Crops, South Africa William Makgoga --- Agricultural Research Council–Grain Crops, South Africa Jan Erasmus --- Agricultural Research Council–Grain Crops, South Africa Sophie Swanepoel --- Agricultural Research Council–Grain Crops, South AfricaGenotype-by-environment interaction (GEI) is typical in multi-environment trials, which complicates the identification of superior genotypes, making selection and recommendation of new sunflower genotypes for different environments challenging and expensive. The objectives of this study were to investigate the GEI, identify... -
Influence of oats cover crop preceding dryland lucerne establishment on some aspects of soil microbial ecology
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Anélia Marais --- Directorate Plant Sciences, Western Cape Department of Agriculture, South Africa Johan Labuschagne --- Directorate Plant Sciences, Western Cape Department of Agriculture, South Africa Mardé Booyse --- Agricultural Research Council – Biometry, South AfricaThe use of cover crops to enhance soil ecology is widely propagated. Soil samples were collected at five depths from plots in newly established (four months) dryland lucerne (Medicago sativa) pasture. Preceding this establishment, the plots were either under Saia... -
Thermal stability of a vegetable oil-based thermal fluid at high temperature
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Aboubakar Gomna --- Laboratoire Énergies Renouvelables et Efficacité Énergétique (LabEREE), Burkina Faso Kokouvi Edem N’Tsoukpoe --- Laboratoire Énergies Renouvelables et Efficacité Énergétique (LabEREE), Burkina Faso Nolwenn Le Pierrès --- LOCIE, France Yézouma Coulibaly --- Laboratoire Énergies Renouvelables et Efficacité Énergétique (LabEREE), Burkina FasoSynthetic and mineral oils are widely used in high temperature processes (above 200°C) as heat transfer fluids or thermal storage materials. Mineral oils are essentially derived from petroleum that is depleting and synthetic oils are expensive. Furthermore, these oils are... -
Yield stability of tropical soybean genotypes in selected agro-ecologies in Uganda
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T Obua --- , Uganda M Nabasirye --- , Uganda M Namara --- , Uganda G Tusiime --- , Uganda M Maphosa --- , Zimbabwe P Tukamuhabwa --- , UgandaDifferential yield response of a genotype is the result of its interaction with the prevailing environment. This makes the task of selecting widely adapted and best soybean genotypes challenging under varied target production environments. The objectives of this study were... -
Frequent burning maintained a stable grassland over four decades in the Drakensberg, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Craig D Morris --- , South Africa Colin S Everson --- , South Africa Terry M Everson --- , South Africa Paul J Gordijn --- , South AfricaThe mesic montane grasslands of the uKhahlamba-Drakensberg, which produce cured flammable fuel, have evolved under and are sustained by recurrent fires. The Brotherton burning trial (12 replicated treatments) was established at Cathedral Peak (1 890 m asl) in 1980 to... -
Models for predicting slenderness coefficient from stump diameter for Tectona grandis stands in south-western Nigeria
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Onyekachi Chukwu --- , NigeriaIllegal logging has continued to be a major cause of depletion of the tropical forests in developing countries. However, empirical means of estimating the growth characteristics of a removed tree, which will facilitate the conviction of illegal loggers in judicial... -
Auto insurance premiums in Ghana: An Autoregressive Distributed Lag model approach to risk exposure variables
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Jacob Azaare --- , China Zhao Wu --- , China Bernard Gumah --- , China Enock Mintah Ampaw --- , Ghana Socrates Modzi Kwadwo --- , GermanyThis study examined risk exposure and auto insurance premium determinants in Ghana. We analysed an existing data set of 23 434 policies (without claims = 84.1%, policies with claims = 15.9%; comprehensive policies = 48.0%, third-party policies = 52.0%) applying... -
Technological characterisation of wood from Australian red cedar after first thinning of a plantation at five years
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Kelvin Techera Barbosa --- , Brazil Andrey Pereira Acosta --- , Brazil Marília Lazarotto --- , Brazil Rafael Beltrame --- , Brazil Claudia Fernanda Lemons e Silva --- , Brazil Claudimar Sidnei Fior --- , BrazilAustralian red cedar (Toona ciliata M. Roem.) is a forest species planted in Brazil especially for lumber production. This study aimed to evaluate technological properties of the wood after selective first thinning of a plantation 5 years after planting. The... -
Contribution of temperate germplasm to the performance of maize hybrids under stress and non-stress environments in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sphiwokuhle Shandu --- , South Africa Edmore Gasura --- , Zimbabwe Kingstone Mashingaidze --- , South Africa John Derera --- , South AfricaIncreases in genetic gains are crucial to maize breeding programmes. The objectives of this study were to identify higher-yielding and stable maize hybrids across stress and non-stress environments, to identify representative test environments for testing and selection of superior maize... -
Intergroup‐movement in a group‐living lizard, Cordylus cataphractus, from South Africa
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Louise Visagie --- University of Stellenbosch, South Africa P. le FrasN. Mouton --- University of Stellenbosch, South Africa AlexanderF. Flemming --- University of Stellenbosch, South Africa -
Understanding the effects of climate change on Southern Ocean ecosystems
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD McQuaid --- Rhodes University, South AfricaUnderstanding the future of Southern Ocean ecosystems requires approaches at micro to macro scales. The Southern Ocean has experienced both top-down and bottom-up perturbations driven by man. The removal of whales and finfish was a top-down disruption, removing enormous levels... -
Effects of succinic acid impregnation on physical properties of sapwood and heartwood from plantation-grown short-rotation teak
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Sarah Augustina --- National Research and Innovation Agency (BRIN), Indonesia Teguh Darmawan --- National Research and Innovation Agency (BRIN), Indonesia Sudarmanto --- National Research and Innovation Agency (BRIN), Indonesia Narto Narto --- National Research and Innovation Agency (BRIN), Indonesia Adik Bahanawan --- National Research and Innovation Agency (BRIN), Indonesia Danang S Adi --- National Research and Innovation Agency (BRIN), Indonesia Dimas Triwibowo --- National Research and Innovation Agency (BRIN), Indonesia Yusup Amin --- National Research and Innovation Agency (BRIN), Indonesia Imran A Sofianto --- National Research and Innovation Agency (BRIN), Indonesia Prabu S Sejati --- National Research and Innovation Agency (BRIN), Indonesia Wahyu Dwianto --- National Research and Innovation Agency (BRIN), Indonesia Witjaksono --- National Research and Innovation Agency, Indonesia Ragil Widyorini --- Universitas Gadjah Mada, Philippe Gérardin --- Université de Lorraine, France Sari Delviana Marbun --- National Research and Innovation Agency (BRIN), IndonesiaThe aim of this study was to improve the properties of 15-year-old short rotation teak wood using a succinic acid (SA) treatment without excessively increasing the weight gain. The samples were classified as sapwood (SW) and heartwood (HW). Samples were... -
Nonlinear evolution equations via resolvent operators on Hadamard manifolds
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Vo Minh Tam --- Dong Thap University, VietnamThe purpose of this work is to study new systems given by evolution equations via resolvent operators for solving Yosida inclusion problems, equilibrium problems and fixed point problems on Hadamard manifolds. Then we show that the systems have a unique... -
Inverse problem of determining the coefficient in a sixth order Boussinesq equation with additional nonlocal integral condition
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A.S. Farajov --- Azerbaijan State Pedagogical University, Azerbaijan M.J. Huntul --- Jazan University, Saudi Arabia Yashar T. Mehraliyev --- Baku State University, AzerbaijanThe work is devoted to the study of the solvability of the inverse boundary value problem with an unknown time depended coefficient for a sixth-order Boussinesq equation with an additional integral condition of the first kind is investigated. First, the... -
Exponential stability results for second-order impulsive neutral stochastic differential equations
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dongdong Gao --- Tongling University, P.R. China Daipeng Kuang --- Hunan Normal University, P.R. China Jianli Li --- Hunan Normal University, P.R. ChinaThis paper is aimed to discuss the existence and exponential stability of mild solutions for second-order impulsive neutral stochastic differential equations (INSDEs). Firstly, we derive the existence of mild solutions for INSDEs by using the Banach fixed point theorem. Then,... -
An inverse problem for pseudoparabolic equation: existence, uniqueness, stability, and numerical analysis
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Kh. Khompysh --- Al-Farabi Kazakh National University, Kazakhstan M.J. Huntul --- Jazan University, Saudi Arabia M.K. Shazyndayeva --- Al-Farabi Kazakh National University, Kazakhstan M.K. Iqbal --- Government College University, PakistanIn this paper, we study an inverse problem for a linear third-order pseudoparabolic equation. The investigated inverse problem consists of determining a space-dependent coefficient of the right-hand side of a pseudoparabolic equation. As an additional information a final overdetermination condition... -
Ensiling as a technique for preservation of the nutritional quality of Vachellia nilotica
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Fortune L Manganyi --- University of South Africa, Julius Tjelele --- Agricultural Research Council–Animal Production: Range and Forage Sciences, South Africa Khanyisile R Mbatha --- University of South Africa, Ngoako Letsoalo --- Agricultural Research Council–Animal Production: Range and Forage Sciences, South Africa Stephen Modiba --- , South Africa Thamsanqa Mpanza --- Agricultural Research Council–Animal Production: Nutrition, South Africa Francuois Müller --- Agricultural Research Council–Animal Production: Range and Forage Sciences, South AfricaFodder tree species are considered to have high nutritional value and have always played a significant role in feeding livestock during the dry seasons. The study was conducted to explore the possibility of preserving chopped Vachellia nilotica shoots as silage... -
Stability and performance of Bambara groundnut (Vigna subterranea (L.) Verdc.) genotypes in different South African environments
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sithembile Kunene --- University of KwaZulu-Natal, Pietermaritzburg campus, College of Agriculture, Engineering and Science, School of Agricultural Earth, and Environmental Sciences, South Africa Abe Shegro Gerrano --- Agricultural Research Council, Vegetable, Industrial and Medicinal Plants, South Africa Alfred Oduor Odindo --- University of KwaZulu-Natal, Pietermaritzburg campus, College of Agriculture, Engineering and Science, School of Agricultural Earth, and Environmental Sciences, South AfricaGlobal food security faces challenges arising from population growth, climate change, and the prevalence of monoculture agriculture. In addressing these concerns, Bambara groundnut (Vigna subterranean (L.) Verdc.) emerges as a promising crop due to its nutritional richness and resilience in... -
Quasi-periodic solutions of some impulsive Duffing equations
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Lu Chen --- Quzhou University, P.R. ChinaIn the present paper, we study the following Duffing equation -
Impact of land use changes on soil physical quality in southeastern Tigray, Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Araya Kahsay --- Adigrat University, Ethiopia Mitiku Haile --- Mekelle University, Ethiopia Girmay Gebresamuel --- Mekelle University, Ethiopia Muktar Mohammed --- Oda-Bultum University, EthiopiaThis study evaluates the effects of land use changes on soil physical quality in southeastern Tigray, northern Ethiopia, using the visual evaluation of soil structure (VESS) method. Soil samples were collected from cropland, grassland, and shrubland sites during two field... -
Stability in an unbounded domain of a Timoshenko system without the second spectrum
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mohammad M. Al-Gharabli --- King Fahd University of Petroleum and Minerals, Saudi Arabia Adel M. Al-Mahdi --- King Fahd University of Petroleum and Minerals, Saudi Arabia Aissa Guesmia --- Université de Lorraine, 3 Rue Augustin Fresnel, FranceThe present paper deals with the stability, in the whole line ℝ, of the so-called truncated version for the Timoshenko system derived, according to significant physical and historical observations, by Elishakoff [11]. This new system gives a version of a... -
Physiological traits associated with drought tolerance in Moroccan chickpea
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Meriem Tabouktirt --- University Hassan II, Morocco Fatoumata Farida Traore --- University Hassan II, Morocco Sara Fahde --- , Morocco Ayyoub Ammar --- University Hassan II, Morocco Hasnae Choukri --- , Morocco Said Boughribil --- University Hassan II, MoroccoIn a greenhouse experiment conducted in Mohammedia, drought stress responses were evaluated under two treatments (100% and 50% of field capacity; FC) in six Moroccan chickpea varieties: Arifi, Bouchra, Farihane, Moubarak, Rizki, and Zahour. The susceptibility index (SI) clearly differentiated... -
On asymptotically almost periodic mild solutions of chemotaxis-fluid systems on bounded domains
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dam Thi Ngoc Van --- Division of Mathematics, Banking Academy of Vietnam, Vietnam Tran Minh Nguyet --- Department of Mathematics, Thang Long University, Vietnam Pham Truong Xuan --- Thang Long University, VietnamWe study the well-posedness and exponential stability of almost periodic (AP-) and asymptotically almost periodic (AAP-) mild solutions for the chemotaxis-Navier-Stokes systems on a bounded domain Ω ⊂ ℝd (d ⩾ 2) with the smooth boundary. Our strategy is: we... -
Weyl double-measure pseudo almost periodic functions and Weyl double-measure pseudo almost periodic solutions to semilinear evolution equations
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Yongkun Li --- Department of Mathematics, Yunnan University, People’s Republic of ChinaThis paper aims to address significant gaps in the theory of almost periodic functions and their applications in differential equations. Although Weyl almost periodic functions generalize Bohr almost periodic functions and Stepanov almost periodic functions, the incompleteness of the space...