A5080115444- Soil Carbon and Nitrogen Dynamics
- Ruminant Nutrition and Digestive Physiology
- Pasture and Agricultural Systems
- Crop Yield and Soil Fertility
- Agronomic Practices and Intercropping Systems
- Soil Management and Crop Yield
- Botany and Plant Ecology Studies
- Nitrogen and Sulfur Effects on Brassica
- Milk Quality and Mastitis in Dairy Cows
- Weed Control and Herbicide Applications
- Food Chemistry and Fat Analysis
- Plant Micronutrient Interactions and Effects
- Soybean genetics and cultivation
- Agricultural Productivity and Crop Improvement
- Plant nutrient uptake and metabolism
- Plant and fungal interactions
- Soil Mechanics and Vehicle Dynamics
- Consumer Packaging Perceptions and Trends
- Sustainability and Ecological Systems Analysis
- Rangeland Management and Livestock Ecology
- Tea Polyphenols and Effects
- Agroforestry and silvopastoral systems
- Heavy metals in environment
- Mycotoxins in Agriculture and Food
- Child Nutrition and Water Access
Stellenbosch University
2006-2024
Plant (United States)
2020
Plant Production Research Institute
2011
The effects of four continuous tillage regimes; mouldboard ploughing, tine-tillage, shallow no-tillage; and three rotations (involving tine-tillage once every two, three, years in rotation with no-tillage), two rates synthetic agrochemicals (standard: regular application agrochemicals; reduced: fewer combination biostimulants) on wheat canola yield quality were investigated between 2018 2020 under typical Mediterranean climatic conditions South Africa. It was hypothesised that a the reduced...
Roughly 90% of farmers in the Western Cape Province South Africa have converted to no-tillage systems improve efficiency crop production. Implementation restricts mixing soil amendments, such as limestone, into soil. Stratification nutrients and pH is expected. A survey was conducted determine extent geographical spread acid soils stratification throughout Cape. Soil samples (n = 653) were taken at three depths (0–5, 5–15, 15–30 cm) from fields. Differential responses (p ≤ 0.05) between two...
Loss of productive agricultural land due to soil degradation poses a serious threat output and sustainability. Soil cultivated pastures manifests as long-term decline in production potential. There are concerns that soils under certain regions South Africa degrading result mismanagement, which include practising continuous tillage, improper grazing management, injudicious application fertilisers poor irrigation management. quality indicators, physical, chemical biological parameters soil,...
Abstract Some no‐tillage systems necessitate amelioration of subsurface acidity. A 2‐year field trial was conducted on a sandy loam Cambisol, with pH (KCl) 4.20 in the 10‐ to 30‐cm depth. The aim evaluate one‐time tillage, calcitic lime forms, and plus gypsum combinations soil chemical parameters, wheat ( Triticum aestivum L.) canola Brassica napus ) production. Incorporation (1.67 Mg ha −1 through chisel plowing increased exchangeable calcium 20‐ depth by 9.1% 210.1%, respectively, after 18...
Abstract Seed drills are used in no‐tillage systems to place seed directly soil. Various furrow openers exist, each with unique and fertilizer placement characteristics, particularly positioning of relation the position seed. Seedling damage may occur if is not appropriate for particular crop. Canola ( Brassica napus L.) small, resulting seedlings susceptible injury by fertilizers. A study was conducted evaluate effect in‐row N a drill fitted single‐ double‐chute tine openers, disc openers....
The response of an irrigated perennial ryegrass-white clover pasture to fertiliser nitrogen application rates 0, 50, 100 and 150 kg N ha−1 applied in either autumn, early winter, late spring or was investigated over a three-year period. Primary dry matter production (PDM) residual (RDM) were recorded five ten weeks after application, respectively. PDM responses determined mainly by rate. On average the highest obtained following applications lowest when winter. Although RDM generally also...
Strategic tillage can be regarded as an important management option under conservation agriculture (CA). The effects of practice and cropping sequence on volumetric water (mm mm-1), inorganic N (mg kg-1) glomalin g-1) content in the 0-300 mm soil layer were studied. Responses after no till (NT), inversion (MP) non-inversion (DT) treatments wheat-lupine-wheat-canola (WLWC), wheat-medic (McWMcW WMcWMc) lupine-wheat-canola-wheat (LWCW) rotations Tillage did not influence (SWC) WLWC or...
Conservation agriculture relies on residue retention, crop rotation and reduced tillage. Crop determines type, while tillage affects load distribution. Although retention is often beneficial, residues can create challenges, including obstruction of planters during establishment stubble-borne diseases. This study determined the effects decomposition response wheat (Triticum aestivum L.) in Western Cape Province, South Africa. Wheat was investigated to determine relationships between its...
The dynamics of soil inorganic-N in reaction to a single, strategic application fertiliser N were studied during the period 2000 2002 an Oakleaf with clay content increasing from 10 30.8% depth. Soil was monitored depth 500 mm (0–100, 200–300 and 400–500 layers) over seven-week (7, 21 49 days) following 0, 50 150 kg ha−1 form LAN (28) applied as one-off perennial ryegrass-white clover pasture five different seasons (autumn, early winter, late spring or spring). Inorganic-N increased possibly...
Adoption of conservation agricultural practices, reduced tillage and crop rotation in the grain-producing areas Western Cape, South Africa, resulted a gradual build-up organic matter on soil surface. It was expected that increase cover would influence water content nitrogen mineralisation potential topsoil. The effect practice (g g−1) mineral-N (mg kg−1) 0–200 mm layer during 2010 2011 assessed. Crop rotation, wheat monoculture (WWWW), lupin–wheat– canola–wheat (LWCW) wheat–medic (McWMcW)...
The response of perennial ryegrass and white clover to fertiliser N rates 0, 30, 60, 120 180 kg ha−1 when grown at soil water potentials of-10, −20, −25 −35 kPa were investigated. Increasing levels from 0 resulted in increased (P=0.05) primary dry matter production (PDM) the end first regrowth cycle (31 days). Ryegrass PDM yield was influenced by potential, with higher yields recorded −10 −20 treatments compared treatments. White not rate or potential. Carry-over caused residual (RDM) as 60...
The influence of a single application fertiliser N (0, 50, 100 and 150 kg ha−1) applied in either autumn, early winter, late spring or on selected nutritive mineral parameters perennial ryegrass-white clover pasture was investigated over three-year period. Responses were measured one regrowth cycle five weeks after the treatments. A sample plant material harvested separated into grass fractions. Dry matter (DM), crude protein (CP), vitro organic digestibility (IVOMD), phosphorus (P) calcium...
No-tillage systems and slow movement of surface-applied limestone can lead to stratification soil acidity. Incorporation lime by tilling is not preferred producers following conservation agriculture practices. There limited research on ways facilitate without disturbance. This study aimed determine the effects form, fineness calcium carbonate equivalent (CCE) calcitic its in with or different disturbance actions consequent productivity barley (Hordeum vulgare L.) canola (Brassica napus L.)....
Abstract Soil microbes are essential for soil nutrient cycling. However, frequent tillage and the use of synthetic agrochemicals can reduce microbial diversity enzyme activity. In this study, effects four treatments (mouldboard plough, shallow tine‐tillage, no‐tillage, rotation) two rates (standard reduced, with biostimulants) on activity were investigated between 2018 2020 in a Mediterranean climate zone South Africa. It was hypothesized that reduction frequency quantity agrochemical...
The 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 either under Saia oats (Avena strigose) crop, or no crop (managed with herbicides). Variables studied aggregate stability, active carbon (KMnO4 oxidation), Solvita® nitrogen and carbon, protozoa (Most Probable Number) utilisation (Biolog Ecoplates™). Principal...
Current fertiliser guidelines for nitrogen (N) application canola under conservation agriculture (CA) in South Africa, may result over-fertilisation. This study aimed to evaluate the effects of N rates and foliar applied on biomass, seed oil yield grown CA. Trials took place from 2016 2019 at Darling, Porterville, Moorreesburg, Riviersonderend Riversdale Western Cape, representing diverse soil climatic conditions. The evaluated 0, 25, 50, 75, 105, 135, 160 190 kg ha−1 using limestone...
Abstract Canola ( Brassicanapus L.) growth and yield can be enhanced by, amongst others, choosing the correct rate, source, timing of N fertilizer. Limited research exists on effects nitrogen (N) source canola properties when grown under conservation agriculture. This study compared performance different fertilizer sources biomass production, seed yield, oil content. Field trials were conducted from 2016 to 2019 at five sites in Western Cape Province South Africa which is characterized by a...