Castor bean production and management practices for yield improvement
1983
Supot Faungfupong (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Effect of frequency of Irrigation on grain yield and some agronomic characteristics of annual castor bean: Effect of frequency of irrigation was tested on H 22 annual castor variety at the National Corn Sorghum Research Center on January 30, 1983. Three irrigation intervals (every 7, 14 and 21 days) were assigned. Longer irrigation intervals caused a delay in flowering and a decrease in numbers of primary raceme and grain yield and also tended to reduce raceme weight and numbers of capsule per raceme. Effect of detopping on annual castor bean: Effect of detopping on annual castor bean was evaluated at the National Corn and Sorghum Research Center on August 22, 1983 using H 22 variety. Treatments consisted of control and seven dates of detopping ranged from the four-leaf stage up to the ten-leaf stage. Detopping practices caused an increase in numbers of branches bearing primary raceme, numbers of primary raceme and grain yield but a decrease in length of primary raceme. An appropriate date for practicing detopping of H 22 variety was the seven-leaf stage.
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