Short Communications

Effect of Ca, K and B supply on growth of cotton (Gossypium hirsutum L.) and tobacco (Nicotiana tabacum L.)

Published in: South African Journal of Plant and Soil
Volume 4, issue 3, 1987 , pages: 143–144
DOI: 10.1080/02571862.1987.10634962
Author(s): N., J.J. Combrink, Republic of South Africa, ElizabethA. Davies, England


The effect of Ca:K ratios and B nutrition was investigated using tobacco and cotton grown in Mitcherlich pots with sand. A nutrient solution with three different ratios of Ca:K and two boron levels was used. Treatments were arranged factorially (3 × 2) and the tobacco and cotton trials were carried out simultaneously under identical greenhouse conditions. Both crops gave the highest yield of leaves at the low Ca:K ratio. For tobacco, where leaves are the end product, this treatment also delayed deterioration of the leaves on the plant during senescence, especially when sufficient B was supplied. This ensured cured leaves with a high sugar content and good moisture-holding capacity. For cotton, the ability of plants to retain their bolls was best at the intermediate Ca:K ratio, resulting in the highest boll yield and probably indicating a need for a higher Ca:K ratio.

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