Chemical pre-harvest desiccation in castor beanThe castor bean has indeterminate growth habit and non-uniformity of grain maturation at harvest. However, preharvest desiccant application can increase the efficiency of mechanized harvesting. The objective of this work was to evaluate effects of the herbicides glyphosate alone or mixed with 2,4-D, and paraquat alone, in pre-harvest desiccation of castor bean. The field experiments were arranged in a completely randomized design, with four replications, in Rancharia, São Paulo State, from March to September 2005. The experiment one evaluated the application of two doses of 2,4-D associated with four doses of glyphosate at 10, 20 and 30 days after application (DAA). The experiment two evaluated four doses of paraquat at 30 DAA. The pre-harvest desiccation of castor bean with 2,4-D + glyphosate showed effect only from 20 DAA. The 2,4-D applied alone provided significant dehydration of the plant, however, the effect was lower than the mixture 2,4-D + glyphosate. The best pre-harvest desiccation in castor bean was obtained with 1.34 kg 2,4-D ha -1 plus 1.42 kg glyphosate ha -1 . The dose 1.2 kg paraquat ha -1 significantly reduced moisture in castor bean, however, it was less efficiently than the mixture 2,4-D + glyphosate.
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