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Die invloed van kalsium en magnesium op die groei van tabakplante en opname van kalium, kalsium en magnesium in waterkultuur
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.J. Steenkamp --- , Republiek van Suid-Afrika J.A. de Bruyn --- Departement Plantkunde, Republiek van Suid-Afrika A.A. Theron --- Departement Grond- en Waterboukunde, Republiek van Suid-Afrika'n Toename in the Ca-konsentrasie van 'n voedingsoplossing het 'n verhoging in biomassa tot gevolg gehad asook 'n verhoogde opname van K en Ca deur tabakplante. Die opname van Mg aan die anderkant word onderdruk deur toenemende konsentrasies van Ca... -
Chemical composition of carrier water influences glyphosate efficacy
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.L. de Villiers --- Small Grain Centre, Republic of South Africa D. du Toit --- , Republic of South AfricaGlyphosate [N-(phosphonomethyl) glycine] phytotoxicity was assessed with different sources of natural water carriers to establish to what extent ions in these carriers antagonize glyphosate activity. Glyphosate phytotoxicity with the most antagonistic carrier was 72% less than with deionized water. Antagonistic... -
Salts in carrier water affect tralkoxydim activity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.L. De Villiers --- Small Grain Centre, Agricultural Research Council, Republic of South AfricaTralkoxydim {2-[1-(ethoxyimino)-3-hydroxy-5-(2,4,6-trimethyl-phenyl)]cyclohex-2-enone} was tested for susceptibility to antagonism from ions in the carrier water with which it is applied. Borehole and municipal water and deionized water, to which various salts were added, were tested. Tralkoxydim activity was antagonized by 20%... -
Optimizing glyphosate performance with adjuvants
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.L. de Villiers --- , South Africa R.C. Lindeque --- , South Africa H.A. Smit --- , South AfricaGlyphosate [N-(phosphonomethyl)glycine] is a non-selective herbicide which is extremely sensitive to antagonism by salts in the spray solution and to environmental conditions at application. Various adjuvants were evaluated with glyphosate in glasshouse and field experiments with the aim of identifying... -
Chlorsulfuron and tribenuron antagonize tralkoxydim activity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. Smit --- , Republic of South Africa B.L. de Villiers --- , Republic of South Africa H.A. Smit --- , Republic of South AfricaHerbicide mixtures are used to increase efficacy on broad-leaved as well as grass weeds and/or to reduce input costs. Components of mixtures may, however, induce antagonism. The aim of this study was to evaluate the efficacy of tralkoxydim (2-(1[etoxyimino)propyl]-3-hydroxy-5-(2,4,6-trimethylphenyl) cyclohex-2-enome)... -
Koranna struggle against the colonial church: the case of Brandewynsfontein
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Piet Erasmus --- Department of Anthropology,Although Goliath Yzerbek, in his struggle to safeguard the perceived land rights of the Koranna, had to deal with many more obstacles than the colonial church, only the interactions of the Berlin Missionary Society with the Koranna of Brandewynsfontein will... -
Estimation of pesticide mixture interaction in Nile tilapia (Oreochromis niloticus) using survival analysis
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KC Kanu --- , Nigeria NH Amaeze --- , Nigeria AA Otitoloju --- , NigeriaThe acute toxicity of the pesticides atrazine, mancozeb, chlorpyrifos and lambda-cyhalothrin, acting singly and jointly, was assessed on Nile tilapia (Oreochromis niloticus) fingerlings. Median lethal concentration (LC50), median lethal time (LT50), and mixture interaction were estimated, whereas survival analysis was...