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Fertilising Commercial Forest Species in Southern Africa: Research Progress and Problems (Part 1)
Item type: Journal Article • Journal: South African Forestry Journal • Authors: M.A. Herbert --- , South Africa A. P.G. Schönau --- , South AfricaSince the inception of forest fertiliser research in Southern Africa in 1926, eight eucalypt, six pine and four acacia species have been tested, encompassing a wide range of sites in summer, winter and uniform rainfall areas. Marked deficiencies of P,... -
Evaluation of veld potential in east griqualand using beef cattle under two grazing management systems
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: U.P. Kreuter --- Department of Agriculture (Natal Region), G.M. Brockett --- Department of Agriculture (Natal Region), A.D. Lyle --- Department of Agriculture (Natal Region), N.M. Tainton --- Department of Grassland Science, D.I. Bransby --- Department of Grassland Science,Beef production from veld, in the short term, was found to be greater under a continuous grazing system than under a rotational grazing system. Average daily gains decreased from a maximum in late‐spring and the highest three‐year mean value was... -
Performance of Medicago sativa under dryland conditions on the eastern Highveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N F G Rethman --- Department of Plant Production, J J Odendaal --- Department of Agriculture & Water Supply, Transvaal Region, C C De Witt --- Department of Agriculture & Water Supply, Transvaal Region,Increased livestock numbers and improved animal performance based on dryland lucerne pastures requiring little or no nitrogenous fertilizer have been demonstrated to be feasible on the eastern Highveld. With large scale planting of lucerne‐based pasture (25% of arable land) 350... -
Grazing of raphanus sativus. L (Japanese Radish)1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N.F.G. Rethman --- Department of Plant Production, Gillian Heyns --- Department of Plant Production,The performance of young woolled sheep was markedly better when grazing Japanese radish early in winter, when more leaf was available .Continuous grazing resulted in better performance than rotational or zero grazing. -
Influence of grazing management on the production of an irrigated grass/legume pasture in the Rûens area of the Southern cape
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.M. vanHeerden --- Department of Agriculture and Water Supply (Winter Rainfall Region), N.M. Tainton --- Department of Grassland Science,The production of an irrigated grass/legume pasture was determined using Merino ewes on rotational and continuous grazing systems. The clover content of the pasture declined, while the grass content increased under both systems. The lucerne content of the rotationally‐grazed pastures... -
Die evaluering van vier Eragrostis curvula ekotipes met weidende skape
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.A. Pieterse --- Departement Plantproduksie, Fakulteit Landbouwetenskappe, Republiek van Suid‐Afrika N.F.G. Rethman --- Departement Plantproduksie, Fakulteit Landbouwetenskappe, Republiek van Suid‐Afrika J.O. Grunow --- Departement Plantproduksie, Fakulteit Landbouwetenskappe, Republiek van Suid‐AfrikaThe evaluation of four Eragrostis curvula ecotypes with grazing sheep. Four ecotypes of Eragrostis curvula, namely, Cape Province 5, Ermelo, Pearston 204 and Makwassie 150 were evaluated in a grazing trial with sheep, at three stocking rates, during two growing... -
Are multi‐paddock grazing systems economically justifiable?
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: M.T. Mentis --- Resource Ecology Group, Department of Botany, Republic of South AfricaThe financial implications of few‐ and multi‐paddock systems were modelled by a discounted cash flow analysis with the (discounted) present value as the dependent variable, and number of paddocks, farm run‐down time, time horizon and discount rate as the independent... -
An evaluation of the empirical basis for grazing management recommendations for rangeland in southern Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.J. O'Reagain --- Department of Agricultural Development (Eastern Cape Region), Republic of South Africa J.R. Turner --- Department of Grassland Science, Republic of South AfricaAnalysis of over 50 grazing experiments conducted in southern Africa does not support certain management recommendations. Furthermore, the conclusions of some experiments are questionable owing to poor experimental design or confirmation bias. Based on available evidence, it was concluded that... -
Towards optimum grazing management for sheep production on crownvetch (Coronilla varia L.)
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D.L. Barnes --- Department of Agricultural Development (Transvaal Region), Republic of South Africa C.P. Dempsey --- Department of Agricultural Development (Transvaal Region), Republic of South AfricaThe performance of wether lambs on crownvetch (Coronilla varia L.) pasture was determined for three seasons under five grazing procedures. These included continuous grazing and rotational grazing with a 7‐day period‐of stay and periods‐of‐absence of 7, 21, 35 or 49... -
The effect of crop rotation with wheat and oats on the incidence of Fusarium crown rot of wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Los --- , Republic of South Africa S.W. Baard --- Department of Plant Pathology, Republic of South Africa W. F.O. Marasas --- Medical Research Council, Republic of South Africa S.A. Burgers --- , Republic of South AfricaCrown rot is a serious disease of wheat in the central and western parts of the Orange Free State. The disease, caused mainly by Fusarium graminearum Group 1, is difficult to control and crop rotation has been suggested as a... -
Crop rotation and tillage effects on yield and the incidence of root and stalk rot in sorghum (Sorghum bicolor)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.C. Flett --- , Republic of South AfricaThe effect of six crop rotation systems, planted under conventional and reduced tillage, on root and stalk rot and grain yield of sorghum was studied. The systems were applied for five seasons until 1991/92 when the effects of the systems... -
Number of isolates of maize root fungi in different crop rotation systems
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E. Smit --- , South Africa G. D.J van Rensburg --- , South Africa F. H.J. Rijkenberg --- , South AfricaThe effect of monoculture maize and rotation with soybeans, sunflower and groundnuts on the incidence of maize root rot were studied in a long-term rotation trial for three seasons. The number of isolates of the common root colonizing fungi was... -
Effect of annual legumes on soil nitrogen and on the subsequent yield of maize and grain sorghum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Bloem --- Department of Agriculture, Conservation and Environment, Republic of South Africa R.O. Barnard --- Department of Plant Production and Soil Science, Republic of South AfricaThe objective of this study was to quantify the nitrogen and yield advantage of cowpea, soybean and groundnuts to succeeding maize and grain sorghum crops. Treatments at six localities consisted of a crop rotation with annual legumes and maize or... -
Productivity and stability of grain yield in wheat and maize as affected by rotational cropping systems in the eastern Free State
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republic of South Africa J.L. Purchase --- , Republic of South Africa A. Barnard --- , Republic of South AfricaThe use of crop rotation in the Eastern Free State to enhance profitability and reduce financial risk related to mono-cropped maize and wheat, has rekindled this research. The aim of this research was firstly to quantify the effect of dry... -
Effect of soil tillage, crop rotation and nitrogen application rates on grain yield of spring wheat (Triticum aestivum L.) in the Swartland wheat producing area of the Republic of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.H. Maali --- Department of Agronomy, Republic of South Africa G.A. Agenbag --- Department of Agronomy, Republic of South AfricaStudies on spring wheat yield components were conducted during the 2000 and 2001 growing seasons only, while grain yield responses to tillage, crop rotation and N rates during these years were compared to the mean yield for the years 1992,... -
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,... -
Effect of soil tillage, crop rotation and nitrogen application rates on plant-N content of spring wheat (Triticum aestivum L.) in the Swartland wheat-producing area of the Republic of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.H. Maali --- Department of Agronomy, Republic of South Africa G.A. Agenbag --- Department of Agronomy, Republic of South AfricaStudies on nitrogen content in spring wheat were conducted during the 2000 and 2001 growing seasons as part of a long-term tillage and crop rotation trial. Four tillage methods were used, namely conventional tillage (CT), tine tillage (TT), minimum tillage... -
Crop rotation in the summer rainfall area of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- ,Crop rotation is the successive growing of different crop species on fields with the aim to assist sustainability. Monoculture cropping, the opposite of crop rotation, of maize was and still is the main practice in the summer rainfall area of... -
Effect of soil tillage, crop rotation and nitrogen application rates on bread-baking quality of spring wheat (Triticum aestivum L.) in the Swartland wheat producing area of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.H. Maali --- Department of Agronomy, Republic of South Africa G.A. Agenbag --- Department of Agronomy, Republic of South AfricaSpring wheat (Triticum aestivum L.) is produced in the wheat producing areas of the Western Cape Province, Republic of South Africa, primarily for bread-baking purposes. Milling and baking characteristics are therefore of utmost importance. In a long-term tillage and crop... -
Effect of grazing frequency and intensity on Lolium perenne L. pastures under subtropical conditions: Herbage production
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: F.R. Mckenzie --- Department of Grassland Science, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaThe dry matter (DM) production of Lolium perenne (perennial ryegrass) pastures was evaluated under subtropical conditions for two years, under five combinations of grazing frequency and intensity, each applied in a rotational grazing system. Simulated continuous grazing (CG) was also... -
Effect of grazing frequency and intensity on Lolium perenne L. pastures under subtropical conditions: Herbage quality
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: F.R. Mckenzie --- Department of Grassland Science, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaThe cellulase dry matter disappearance (CDMD) and herbage nitrogen (N) of Lolium perenne (perennial ryegrass) were evaluated for pastures grown under subtropical conditions for two years, under five combinations of grazing frequency and intensity, each applied in a rotational grazing... -
Age determination of miombo species Brachystegia spiciformis (Leguminosae – Caesalpinoideae) in Zimbabwe using growth rings
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: I.M. GrundyThe objective of this study was to determine whether Brachystegia spiciformis Benth. (Leguminosae – Caesalpinoideae), one of the dominants of dry miombo woodland in Zimbabwe, forms annual growth rings. In the past the production of effective cutting rotations and sound... -
The Influence of Short Rotation Forestry on Wood Production for Sawnwood and Veneer
Item type: Journal Article • Journal: South African Forestry Journal • Authors: C.P. Kromhout --- Department of Environment Affairs, D.L. Bosman --- Council for Scientific and Industrial Research,Short rotations for the production of saw and veneer logs range from 20 to 35 years during which logs of the required size and quality are produced provided that thinning and pruning regimes are meticulously adhered to. Early and regular... -
Early Respacement and Fewer Thinnings can Increase Profitability of Coniferous Sawtimber Production
Item type: Journal Article • Journal: South African Forestry Journal • Authors: B.V. Bredenkamp --- Natal Forestry Research Centre, J. S.J. Venter --- , H. Haigh --- Natal Forestry Research Centre,A pine sawtimber production regime using wider initial spacing, early respacement, fewer thinning operations and a shortened rotation is proposed. The proposal is compared with a commonly accepted regime for ranges of interest rates and pulpwood prices. Benefits are lowered... -
Biomass production and carbon storage of Populus ×canadensis Guinier I-214 plantations grown at Pogradeci region in Albania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: E Toromani --- Department of Forestry, Albania M Sanxhaku --- Observatory of Meteorology, Albania M Sallaku --- Department of Biotechnology, Albania E Shaho --- Forest Engineer, AlbaniaFast-growing plantations of Populus ×canadensis Moench (syn. P. ×euramericana (Dode) Guinier ex Piccarolo) clone I-214 have good potential for biomass production. The objective of the study was estimation of biomass using allometric equations and estimation of carbon allocation according to... -
A qualitative exploratory study: Using medical students' experiences to review the role of a rural clinical attachment in KwaZulu-Natal
Item type: Journal Article • Journal: South African Family Practice • Authors: PD Mc Neill --- Facilitator at the Centre for Rural Health, LM Campbell --- School of Education, University of KwaZulu-Natal,Objectives: There are challenges when it is considered that a main role of a rural clinical attachment for medical students is to encourage students to return after graduation to practise in rural areas. This view may lead to the relative... -
Improving productivity and sustainability of successive rotations of Acacia auriculiformis plantations in South Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vu Dinh Huong --- Forest Science Institute of South Vietnam, Vietnam EK Sadanandan Nambiar --- CSIRO Land and Water Flagship, Australia Le Thanh Quang --- Forest Science Institute of South Vietnam, Vietnam Daniel S Mendham --- CSIRO Land and Water Flagship, Australia Pham The Dung --- Forest Science Institute of South Vietnam, VietnamWe studied the productivity of Acacia auriculiformis plantations in South Vietnam over three successive rotations covering 15 years. The focus of our study was on the effects of inter-rotation management on stand growth and soil properties. Contrastin g slash and... -
Audit firm rotation and audit report: evidence from the Tehran Stock Exchange
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Saman Mohammadi --- Department of Accounting, Iran Mohammad Monfared Maharlouie --- Master of Accounting, Iran Sepideh Kazemi Noori --- Financial Management, IranThis research is an attempt to study the relationship between audit firm rotation and audit reports in companies listed on the Tehran Stock Exchange from 2003 to 2011. Due to the nominal nature of the variables, this study uses a... -
Flexibility as risk factor for stress-fracture development in South African male soldiers
Item type: Journal Article • Journal: South African Family Practice • Authors: PS Wood --- Department of Physiology, Division Biokinetics and Sport Science, South Africa PE Krüger --- Department of Physiology, Division Biokinetics and Sport Science, South AfricaBackground: Stress fractures are a common military training injury. Flexibility of muscles and joints may directly influence stress-fracture risk by way of altering the forces applied to bone. Hip external rotation and ankle plantar- and dorsiflexion have been inconsistently reported... -
Soil water and mineral nitrogen content as influenced by crop rotation and tillage practice in the Swartland subregion of the Western Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Japie D Wiese --- Department of Agronomy, South Africa Johan Labuschagne --- Directorate Plant Science, South Africa Gert A Agenbag --- Department of Agronomy, South AfricaAdoption of conservation agricultural practices, reduced tillage and crop rotation in the grain-producing areas of the Western Cape, South Africa, resulted in a gradual build-up of organic matter on the soil surface. It was expected that the increase in organic... -
Crop rotation and tillage system effects on reducing ryegrass occurrence in spring wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sinovuyo M Nteyi --- Department of Agricultural Management, South Africa Raymond MB Auerbach --- Department of Agricultural Management, South Africa Michael I Ferreira --- Plant Sciences, South Africa Johan Labuschagne --- Plant Sciences, South AfricaUnder the Mediterranean climatic conditions of the Western Cape province, the Swartland region is intensively cropped, producing spring wheat (Triticum aestivum L.), but due to ryegrass competition, yield is reduced. In addition, ryegrass has developed resistance to herbicides. This necessitates... -
Effect of varying degrees of plant residue cover from different crops on annual medic pasture re-establishment and production
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Andries A Le Roux --- Directorate Plant Sciences, Western Cape Department of Agriculture, South Africa Johann A Strauss --- Directorate Plant Sciences, Western Cape Department of Agriculture, South Africa Petrus J Pieterse --- Department of Agronomy, South AfricaAnnual medics can play an important role as a pasture crop in short-rotation pasture-cropping systems in the Overberg district of South Africa. Permanent soil cover, an important aspect of conservation agriculture, and different crops in rotation may be, amongst other... -
Optimal grazing management strategies: evaluating key concepts
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Richard WS Fynn --- Okavango Research Institute, University of Botswana, Botswana Kevin P Kirkman --- Grassland Science, South Africa Riaan Dames --- , NamibiaRangeland management strategies must be based on robust ecological and economic concepts if they are to be effective and profitable. Thus, the aim of this paper was to examine concepts related to grazing and resting of grassland and associated effects... -
A global assessment of Holistic Planned Grazing™ compared with season-long, continuous grazing: meta-analysis findings
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Heidi-Jayne Hawkins --- Department of Biological Sciences, South AfricaIt has been claimed that Holistic Planned Grazing™ (HPG), a type of rotational grazing, can increase productivity in rangelands and reverse climate change while doubling the stocking rate, mainly through the impact of densely bunched animals on primary production. Previous... -
Increasing crop diversity increased soil microbial activity, nitrogen-sourcing and crop nitrogen, but not soil microbial diversity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Zander S Venter --- Department of Animal Sciences, South Africa Samantha L Scott --- Plant Conservation Unit, South Africa Johann Strauss --- Directorate-Plant Sciences, Western Cape Department of Agriculture, South Africa Karin Jacobs --- Department of Microbiology, South Africa Heidi-Jayne Hawkins --- Conservation South Africa, Centre for Biodiversity Conservation, Kirstenbosch National Botanical Gardens, South AfricaThe relationships between crop diversity, soil microbial diversity and agroecosystem functioning are not well understood. Soils under wheat monoculture, wheat–medic, and wheat–medic plus clover rotations from a 19-year-old wheat rotation trial in South Africa were measured for soil microbial functional... -
Impact of seed burial depth on the emergence and growth of annual forage legumes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Francuois L Müller --- Department of Biodiversity and Conservation Biology, South Africa Lincoln Raitt --- Department of Biodiversity and Conservation Biology, South Africa Lilburne Cyster --- Department of Biodiversity and Conservation Biology, South AfricaThe importance of evaluating the tolerance of forages to deeper seed burial is often overlooked. Therefore, this study evaluated the effects of increased seed burial depth on the emergence, vigour and early seedling growth of annual forage legume cultivars in... -
Rotational grazing approaches reduces external and internal parasite loads in cattle
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Monde Rapiya --- Department of Livestock and Pasture Science, South Africa Heidi-Jayne Hawkins --- Department Biological Sciences, South Africa Voster Muchenje --- Department of Livestock and Pasture Science, South Africa John F Mupangwa --- Department of Animal Sciences, Namibia Munyaradzi C Marufu --- Department of Production Animal Studies, South Africa Kennedy Dzama --- Department of Animal Sciences, South Africa Cletos Mapiye --- Department of Animal Sciences, South AfricaWe tested whether holistic planned grazing (HPG) and four-camp grazing (FCG) rotational grazing approaches influence beef cattle parasites counts compared with continuous, season-long (SLG) grazing. We expected that parasite counts would increase linearly with increasing camp occupancy by cattle from... -
Audit quality and independence concerns in the South African audit industry: Contrasting views
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Michael Harber --- College of Accounting, University of Cape Town, South Africa Ben Marx --- Department of Accountancy, South AfricaAudit quality in South Africa is perceived by the audit regulator to be deteriorating, with the primary cause being a compromise of auditor independence, mostly as a result of excessively long audit firm tenures. The regulator has responded with mandatory... -
Effects of long-term grazed crop and pasture systems under no-till on organic matter fractions and selected quality parameters of soil in the Overberg, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jacques DV Smith --- Department of Soil Science, South Africa Johann A Strauss --- Western Cape Department of Agriculture, South Africa Ailsa G Hardie --- Department of Soil Science, South AfricaThere is limited soil research on semi-arid, grazed no-till crop and pasture systems. The long-term (10 years) effect of three grazed no-till dryland crop and pasture rotation systems, and perennial lucerne pasture were assessed on soil carbon (C) and nitrogen... -
Risk-based portfolio sensitivity to covariance estimation
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Hannes du Plessis --- , Paul van Rensburg --- ,Risk-based portfolio construction methods focus on optimally extracting information from the covariance matrix of asset returns, as opposed to utilising forecasts of expected returns, in determining the portfolio allocation. This improves their robustness to estimation error in means, but this... -
Evaluation of an improved Katambora grass cultivar G HR1 for root-knot nematode management in tobacco
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Privilege T Makunde --- , Zimbabwe Susan Dimbi --- , Zimbabwe Tafadzwa S Mahere --- , Zimbabwe Stanford Banana --- , Zimbabwe Cleopas C Chinheya --- , ZimbabweIncreased environmental, human and animal health concern with nematicides use in controlling root-knot nematode (Meloidogyne spp.) in tobacco (Nicotiana tabacum L.) has fostered the need to find environmentally-friendly alternatives. Among these alternatives is the use of non-host crops in rotation... -
Weed species diversity and shifts in Conservation Agriculture-based crop rotation systems on the Highveld area of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Elbé Hugo --- , South Africa Maryke Craven --- , South Africa Andries A Nel --- , South AfricaThe occurrence and infestation levels of weed species are known to vary greatly within Conservation Agriculture (CA) systems as weed species will react differently to different habitats. Two on-farm CA trial sites, near Buffelsvallei and Viljoenskroon respectively, were established during... -
A history of Conservation Agriculture in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: JA Strauss --- , South Africa PA Swanepoel --- , South Africa H Smith --- , South Africa EH Smit --- , South AfricaConservation Agriculture (CA) is a holistic farming system aimed at the conservation of natural resources by halting soil erosion and increasing biodiversity in cropping systems, while still effecting sustainable production. Conservation agriculture is based on three principles, namely minimum soil... -
Response of soil carbon fractions in a Haplic Cambisol to crop rotation systems and residue management practices under no tillage in the Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: I Gura --- , South Africa PNS Mnkeni --- , South Africa CC du Preez --- , South Africa JH Barnard --- , South AfricaSoil organic carbon (SOC) is a major indicator of soil quality and/or health but its slow short-term response to management changes has prompted the search for more sensitive indicators for monitoring short-term changes in soil organic matter (SOM). This study... -
Effect of rotational harvesting on the size composition of Cape rock oysters Striostrea margaritacea on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Steyn --- Oceanographic Research Institute, South Africa JC Groeneveld --- Oceanographic Research Institute, South Africa J Santos --- Norwegian College of Fishery Science, Uit – The Arctic University of Norway, NorwayA commercial fishery for the Cape rock oyster Striostrea margaritacea along the north coast of KwaZulu-Natal, South Africa (western Indian Ocean), follows a 4-year rotational cycle, with each harvest year followed by 3 fallow years across four harvest zones. We... -
The effect of crop rotation on soil health in the north-western Free State region, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Melanie de Bruyn --- University of the Free State, South Africa Andre Nel --- University of the Free State, South Africa Johan van Niekerk --- Independent research agronomist,Soil health is an important aspect of sustainable agriculture. By maintaining soil health, crop yields can be consistently successful without negatively affecting the environment. The objective of this study was to evaluate the effects that different cropping systems have on... -
Viability of shortened canola production systems in a winter rainfall region of South Africa based on eleven years of field data
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: JA Strauss --- , South Africa L Nowers --- , South Africa M Booyse --- Agricultural Research Council, Biometry, South Africa M Van der Rijst --- Agricultural Research Council, Biometry, South AfricaCrop rotation is a key component of conservation agriculture, known to enhance yields and break the cycles of pests and diseases. In the Western Cape, South Africa, canola has become an increasingly important cash crop, with producers considering shorter rotation... -
Functional diversification and performance of wheat–canola rotations in the Western Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A Louw --- Stellenbosch University, South Africa PA Swanepoel --- Stellenbosch University, South Africa S van der Westhuizen --- Stellenbosch University, South Africa J Strauss --- Stellenbosch University, South AfricaCrop rotation serves as a fundamental pillar within conservation agriculture (CA) farming systems, enabling the integration of more diverse crops and livestock. With increasing weather variability, new methods are needed to assess the long-term effects of diversification on the agronomic... -
Measuring adaptive decision making in livestock grazing systems
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Jenna M Likins --- Department of Rangeland, Wildlife and Fisheries Management, Texas A&M University, College Station, USA Jason E Sawyer --- East Foundation, USA Urs P Kreuter --- Department of Ecology and Conservation Biology, Texas A&M University, College Station, USAAdaptive management is essential for managing complex grazing systems under environmental uncertainty. However, its implementation in grazing operations is inconsistently defined and measured. This study addresses this limitation by developing and validating the Adaptive Management Index (AMI), a standardised instrument...