Limitation of secondary growth influencing grain and oil yield of castor bean hybrids
Palavras-chave:Ricinus cummunis, Source-sink, Plant management.
ResumoCycle reduction and uniform fruit maturation are desired characteristics for a mechanical harvest of castor bean crop. The objective of this research was to study the effect of secondary growth limitation on growth and production parameters of castor bean plants. A field experiment was conducted between February and May 2012 in a randomized block design in a factorial 2x2, with four replications. Two castor bean hybrids (Hybrid 12 and Hybrid 18) were grown in two cultivation manners: (i) plants without growth limitation, and (ii) plants with secondary stem growth limitation (thinning with pruning). Limitation on the secondary growth resulted in higher assimilates partitioning to the primary raceme, promoting higher number and dry weight of grains. As an effect, plants with only the primary raceme presented equivalent grain yield to plants without growth limitation. Oil yield of plants with only the primary raceme was equivalent to the control for the hybrid 12 and higher for the hybrid 18, with advantage of uniform maturation for these plants.
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