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The efficacy of liquid seaweed extract on the yield of canola plants
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.I. Ferreira --- Production Technology, Republic of South Africa A.F. Lourens --- , Republic of South AfricaThe efficacy of auxin/cytokinin (Kelpak) on its own and in a mixture with the herbicide clopyralid (Lontrel 100), for post-emergence application at various growth stages in canola (Brassica napus) was assessed. A Kelpak foliar application at 2 I ha−1 applied... -
Effect of chemical seed treatment on the germination and seedling vigour of canola (Brassica napus var. oleifera)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. de Villiers --- Department of Agronomy, South Africa G.A. Agenbag --- Department of Agronomy, South Africa S.C. Lamprecht --- , South AfricaIncubation studies were conducted to determine effects of two chemical seed treatments (Cruiser & SA-combination) on the germination and seedling vigour of canola (cv. Varola 44) seed. Germination percentages of the Cruiser and SA-combination treated seeds were not significantly reduced... -
Effect of chemical seed treatment on the germination and seedling growth of canola under different soil conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. De Villiers --- Department of Agronomy, South Africa S.C. Lamprecht --- , South Africa G.A. Agenbag --- Department of Agronomy, South AfricaStudies in a temperature controlled greenhouse were conducted to determine if phytotoxic effects of chemical seed treatments found in incubation studies also have an effect on the germination- and seedling vigour of canola (cv Varola 44) seed planted in simulated... -
Effect of chemical seed treatment, seeding rate and row width on plant populations and yield of canola (Brassica napus var. oleifera)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. De Villiers --- Department of Agronomy, South Africa G.A. Agenbag --- Department of Agronomy, South AfricaField experiments were conducted in 2003 and 2004 at Roodebloem, representing the Rûens, in the canola production area of the Western Cape Province to determine the influence of seeding rate, row width and chemical seed treatment on the plant density... -
Crop rotational effects on irrigated winter and summer grain crops at Vaalharts
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , S.C. Lamprecht --- ,The beneficial effect of crop rotation on yield is well known on annual dryland cropping while knowledge is lacking on the rotational effect in short cycle cropping with two annual irrigated crops. Canola, barley and wheat were rotated with groundnut,... -
The effect of nitrogen and sulphur on the grain yield and quality of canola (Brassica napus L.) grown in the Western Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Wonder Ngezimana --- Department of Agronomy, South Africa Gert A Agenbag --- Department of Agronomy, South AfricaOn average low grain yields of less than 1.5 t ha-1 are obtained with canola in the Western Cape province of South Africa. Injudicious use of fertiliser has been suggested as a major cause, hence the study was done to... -
The effect of nitrogen and sulphur on the agronomical and water use efficiencies of canola (Brassica napus L.) grown in selected localities of the Western Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Wonder Ngezimana --- Department of Agronomy, South Africa Gert A Agenbag --- Department of Agronomy, South AfricaThe grain yield per unit of plant-available nitrogen (N) and sulphur (S) nutrients in the soil is usually low in most crops, including canola. Besides the ability of different crops in utilising nutrients, soil and climatic conditions can also influence... -
South African seed oils are safe for human consumption
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: M Opperman --- Functional Foods Research Unit, Department of Biotechnology and Consumer Science, AJS Benadé --- Functional Foods Research Unit, Department of Biotechnology and Consumer Science, CF Abrecht --- Cancer Association of South Africa, LL Matsheka --- Functional Foods Research Unit, Department of Biotechnology and Consumer Science,Objectives: A diet that is high in fat and low in carbohydrates is advocated in the recently published The Real Meal Revolution. A suggestion was made in this publication that seed oils are toxic. The authors stated that available seed... -
Effect of once-off tillage on soil water, inorganic nitrogen and glomalin contents under conservation agriculture in the Swartland sub-region of the Western Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Johan Labuschagne --- , South Africa Johan van Zyl --- , South Africa Gert A Agenbag --- , South Africa Izane R Crous --- , South Africa Josias E Hoffman --- , South AfricaStrategic tillage can be regarded as an important management option under conservation agriculture (CA). The effects of tillage practice and cropping sequence on volumetric water (mm mm-1), inorganic N (mg kg-1) and glomalin (mg g-1) content in the 0-300 mm... -
The effect of fishmeal replacement with terrestrial protein sources on growth, body condition and intestinal microbiota of juvenile dusky kob Argyrosomus japonicus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CLW Jones --- , South Africa A Nel --- , South Africa A Adesola --- , South Africa T Shipton --- , South Africa H Kaiser --- , South AfricaA balanced combination of protein sources to partially replace fishmeal in the diets of cultured carnivorous fish can promote optimal fish health and production performance. In the present study, the growth, body condition and gut microbiota of juvenile dusky kob... -
The influence of seed-drill choice on crop performance in a semi-arid production region of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Johann Strauss --- , South Africa Karen Truter --- , South Africa Pieter Swanepoel --- , South AfricaA seed-drill should facilitate seed placement in an environment conducive to uniform seedling emergence. In semi-arid rain-fed production regions, low rainfall intensity and erratic rainfall events can result in non-uniform emergence. Evaluation of seed-drills is necessary to supply small grain... -
Nitrogen fertiliser demand of canola is low when produced in conservation agriculture systems in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Izané Riana Crous --- Stellenbosch University, South Africa Johan Labuschagne --- Stellenbosch University, South Africa Pieter Andreas Swanepoel --- Stellenbosch University, South AfricaCurrent fertiliser guidelines for nitrogen (N) application for canola under conservation agriculture (CA) in South Africa, may result in over-fertilisation. This study aimed to evaluate the effects of N rates and foliar applied N on biomass, seed and oil yield... -
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... -
Comparative benchmarking of fertiliser uses for oilseed crop production in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: HT Ottermann --- , South Africa SJ Haarhoff --- Stellenbosch University, South Africa KJ Truter --- , South Africa F Meyer --- , South Africa D van der Westhuizen --- , South Africa PA Swanepoel --- Stellenbosch University, South AfricaThis study comparatively benchmarks fertiliser use over two periods (2013–2015; 2021–2023) in South Africa's oilseed crop production [soybean (Glycine max), canola (Brassica napus) and sunflower (Helianthus annuus)] against global trends, with a focus on major oilseed exporters. It explores fertiliser...