Acidez do solo afetando concentração de micronutrientes, atividade da enzima nitrato redutase e produtividade em plantas de arroz de terras altas
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Data
2013-01-01
Autores
Moro, Edemar
Costa Crusciol, Carlos Alexandre [UNESP]
Cantarella, Heitor
Nascente, Adriano Stephan
Moro, Adriana Lima
Broetto, Fernando [UNESP]
Título da Revista
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Editor
Universidade Estadual de Londrina (UEL)
Resumo
The lowest grain yield of rice under no-tillage system (NTS) in relation to the conventional system may be due to the predominance nitrate in the soil and the low nitrate reductase activity. Another reason may be caused by micronutrient deficiency because of superficially soil acidity corrections. Therefore, the objective of this study was to evaluate the changes caused by soil pH in the N forms in the soil, micronutrients concentration in rice plants, nitrate reductase activity, yield of rice and its components. The experiment was performed in a greenhouse conditions. The experimental design was a completely randomized in a factorial three (levels of soil acidity) x five (micronutrients sources) with four replications. The addition of micronutrients does not affect levels of nitrate and ammonium in the soil; soil acidity significantly affects levels of nitrate and ammonium in the soil, concentration of micronutrients in rice plants and crop yield and its components; medium soil acidity (pH 5.5) result in medium to high levels of Cu and Fe, medium level of Zn and Mn, high nitrate reductase activity, resulting in higher dry matter, tillers, panicles, spikelets, weight of 100 grains and hence grain yield.
Descrição
Palavras-chave
Oryza sativa, soil fertility, soil acidity, yield, no-tillage system
Como citar
Semina-ciencias Agrarias. Londrina: Univ Estadual Londrina, v. 34, p. 3397-3410, 2013.