Effect of sowing date on flowering, boll setting and yield of cotton
1997
Desta Gebre | Gebremedhin Woldewahid (IAR, Addis Abeba (Ethiopia))
Cotton (Gossypium hirsutum L.) yield is related to the number of flowers produced and bolls retained. flower production and boll retention are influenced by a wide range of management factors such as cultivar selection and sowing dates. To study the effect of sowing dates on flower production, boll setting and yield, an experiment was conducted at Werer Research Center from 1993 to 1995 main cropping seasons. the experiment consisted of six sowing dates arranged in a randomized complete block design (RCBD) in four replications. Combined analysis over years showed that there were highly significant differences for all parameters studied but stand count. Higher number of flowers and bolls/square meter, bigger boll size, higher seed cotton yield, lower number of scars/square meter and shorter plants were obtained from April first to May first sown cotton as compared to the late sown cotton. For April first sown cotton, however, peak boll opening coincided with the rainy period and hindered picking. This problem was not observed for April 16 and May first sown cotton. It can, therefore, be concluded that the interval between April 16 and May first is the optimum sowing time for cotton under middle Awash condition.
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