Abstract
The objective of this study was to evaluate the chemical composition and yield of the soybean in response to the application of plant growth regulator to a soybean crop. For this purpose, seeds of the cultivar BRS 246 RR were sown in October of the agricultural years 2007/2008 and 2008/2009, in an experimental layout of complete blocks, with randomized treatments and four replications. The treatments, arranged in factorial design, consisted of the combination of seed treatments and plant growth regulator (with and without 0.5 L 100kg-1 of seeds) and five doses of the product (0, 0.125, 0.25, 0.375 and 0.5 L ha-1) applied to the leaves at two stages of the crop development (V5 or R3). A liquid growth regulator, Stimulate®, from Stoller of Brazil Ltda was used, consisting of three plant growth regulators in the following concentrations: 0.005% indolebutyric acid IBA - IBA (auxin analogue), 0.009% kinetin (cytokinin) and 0.005% gibberellic acid - GA3 (gibberellin). The use of plant growth regulator had an influence on the increase in productivity; oil and protein levels were altered by the action of the regulator, which tended to favour the protein content.
Highlights
The objective of this study was to evaluate the chemical composition and yield of the soybean in response to the application of plant growth regulator to a soybean crop
Com o ajuste de modelos quadráticos, as equações para teores de óleo geraram pontos de mínimo (P.M.), com seus respectivos mínimos da função (M.F.); no entanto, no que se refere aos teores de proteínas, a equação obtida propiciou um ponto de máximo (P.M.), com seu respectivo máximo da função (M.F) (Figura 3; 4 e 5)
Revista Brasileira de Sementes, v. 23, n. 02, p. 222-228, 2001
Summary
Leandro Paiola Albrecht2*, Alessandro de Lucca e Braccini, Carlos Alberto Scapim, Marizangela Rizzatti Ávila e Alfredo Junior Paiola Albrecht. Algumas pesquisas demonstram o efeito de biorreguladores com ação promotora na cultura da soja, como os de Klahold et al (2006), Campos et al (2008) e Moterle et al (2008), que apontam resultados concernentes ao desempenho das plantas e componentes da produção. Entretanto, ainda é importante elucidar questões pertinentes ao uso de biorreguladores em soja, seja no âmbito do desempenho agronômico ou na composição química das sementes; visando fornecer informações que permitam o melhor posicionamento de produtos à base de reguladores vegetais na obtenção de rendimentos superiores, assim como indicar tecnologias que propiciem grãos com teores de óleo e proteínas desejáveis. A semeadura foi realizada em 20/10/2007 (1o Ano) e 20/10/2008 (2o Ano), Figura 1 - Dados climáticos diários de temperaturas máxima e mínima, precipitação pluvial, no ano agrícola 2007/2008 e 2008/2009, na Fazenda Experimental de Iguatemi (FEI)
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