Effect of Trinexapac-ethyl associated with nitrogen fertilization on upland rice nutritional status and grain yield
DOI:
https://doi.org/10.33448/rsd-v9i11.9409Keywords:
Oryza sativa L.; Nitrogen rates; Gibberellin; Growth regulator; Leaf diagnosis.Abstract
Trinexapac-ethyl spraying time and proper nitrogen rate are essential to reduce plant height and lodging at harvest, without affecting rice yield and nutritional balance. This study aimed to evaluate trinexapac-ethyl spraying time and N contents as topdressing for upland rice paddies. The experiment was carried out in a randomized block design and a 4x5 factorial scheme, with four replications. Treatments consisted of four trinexapac-ethyl spraying times, in the phenological stages of tillering, floral differentiation, between tillering and floral differentiation, and a control (without spraying), and five nitrogen rates (0, 50, 100, 150, and 200, kg ha-1) as topdressing. As nitrogen topdressing rates increased, leaf contents of N, Fe++, and Zn++ increased, while S and Mn++ decreased; however, contents of P, Ca++, Mg++, B, and Cu++ were little influenced. When trinexapac-ethyl was applied, leaf contents of N, P, S, B, and Zn++ were little influenced, while P, Ca++, Mg++, Fe++, and Mn++ increased, and Cu++ decreased. Trinexapac-ethyl can be applied at tillering without decreasing rice yield. Upland rice increased grain yield by 58 and 46% in two consecutive crop years due to application of about 120 kg N ha-1 as topdressing.
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Copyright (c) 2020 Samuel Ferrari; Luis Fernando dos Santos Cordeiro; Luís Guilherme Delovo Carara; Vagner do Nascimento; Paulo Renato Matos Lopes; Evandro Pereira Prado; Ronaldo da Silva Viana
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