Influence of the limitation of axillary bud growth on grain and oil yield of castor bean hybrids

• Autor(a) principal: Fioreze, Samuel Luiz
• Data de Publicação: 2018
• Outros Autores: Lara-fioreze, Ana Carolina Da Costa, Pivetta, Laerte Gustavo, Rodrigues, João Domingos [UNESP], Zanotto, Mauricio Dutra [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/0034-737X201865020003; http://hdl.handle.net/11449/212518
• topic: Ricinus cummunis L; source-sink relationship; plant management; Ricinus cummunis L; fonte-dreno; manejo de plantas

Cycle 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 scheme 2 × 2, with four replications. Two castor bean hybrids (Hybrid 12 and Hybrid 18) were grown in two cultivation systems: (i) plants without growth limitation and (ii) plants with secondary stem growth limitation (thinning with pruning). Removal of secondary stems resulted in higher partitioning of assimilates to the primary raceme, promoting higher number and dry weight of grains. As a result, plants with only the primary raceme presented grain yield equivalent 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.