Soil acidity as affecting micronutrients concentration, nitrato reductase enzyme activity and yield in upland rice plants

Semina: Ciências Agrárias

Fernando Broetto¹  Carlos Alexandre Costa Crusciol²  Edemar Moro²  Heitor Cantarella²  Adriana Lima Moro²  Adriano Stephan Nascente² 

[1] Instituto de Biociências;Universidade do Oeste Paulista;

关键词: Oryza sativa;    Soil fertility;    Soil acidity;    Yield;    No-tillage system;   

DOI  :  10.5433/1679-0359.2013v34n6Supl1p3397

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown