Cotton spacing experiments in Uganda

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Abstract
Recently developed mathematical models have been used to study the effects of plant population density and arrangement on the yield of cotton in central Uganda. Optimum density did not vary with variety, but was less with bollworm infestation, infertile soils and drought. A reasonable compromise between a population density suitable for adverse conditions and one suitable for good conditions is 7·4 plants m−2. This population is best achieved with 0·45 × 0·25 m spacing but if such rows are too close to manage then 0·2 m in rows 0·7–0·9 m apart is recommended. The mathematical models used in the study are discussed and appraised.