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Effect of Ca, K and B supply on water-stress induced chlorophyll loss from tobacco and cotton leaf discs
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: ElizabethA. Davies --- , England N. J.J. Combrink --- , Republic of South AfricaA study was made of the influence of Ca:K ratios and B levels on the chlorophyll content of tobacco and cotton leaves grown under glasshouse conditions. Excised leaf discs were floated on a solution of polyethylene glycol 6000 to study... -
An hypothesis concerning the development of the red leaf disorder in cotton (Gossypium hirsutum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. J.J. Combrink --- , Republic of South AfricaThe development of the physiological disorder of cotton known as ‘rooidood’, ‘red leaf disorder’ or ‘potassium deficiency syndrome’ has not yet been explained. Several stress conditions have been associated with this disorder, including low N levels in leaves, low K... -
The effect of age on the reproductive output of the abalone pest Terebrasabella heterouncinata (Polychaeta: Sabellidae: Sabellinae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Simon H Kaiser PJ BritzHigh levels of infestation by the polychaete Terebrasabella heterouncinata on cultured abalone may be attributed to elevated levels of fecundity in comparison with conspecifics in their natural habitat. It is not, however, known if a high reproductive output is sustained... -
SAFRING longevity and movement records for southern African vultures (subfamilies Aegypiinae and Gypaetinae)
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Dane M Paijmans --- Animal Demography Unit, Department of Biological Sciences, South Africa Sarah Catto --- Animal Demography Unit, Department of Biological Sciences, South Africa H Dieter Oschadleus --- Animal Demography Unit, Department of Biological Sciences, South AfricaLongevity and displacement records aid in the understanding of animal senescence and the possible range of a species. Within wild populations this information is infrequent with most longevity reports being based on captive individuals and displacements being calculated from few...