Resposta do feijoeiro 角 aplica o de nitrog那nio na semeadura e cobertura no sistema plantio direto = Response of the common bean to nitrogen application at sowing and topdressing in non-tillage systems

作者：Elias Franco; Carlos Alberto de Bastos Andrade; Carlos Alberto Scapim; Paulo Sergio Loureno de Freitas

来源：Acta Scientiarum - Agronomy, 2008.

• Phaseolus vulgaris L.
• aduba o nitrogenada
• parcelamento do nitrogenio
• teores foliares
• produ o de gr os
• Phaseolus vulgaris L
• nitrogen fertilization
• nitrogen split application
• foliar content
• grains yield

O manejo da aduba o nitrogenada no sistema plantio direto 谷 muitoimportante, e a resposta 角 sua aplica o depende da dose aplicada e da 谷poca de sua aplica o. O objetivo do trabalho foi avaliar as respostas de diferentes doses e m谷todos de aplica o de nitrog那nio para a cultura do feijoeiro em plantio direto. Os tratamentos foram:T1 = 0; T2 = 20 + 30; T3 = 40 + 60; T4 = 60 + 90; T5 = 80 + 120 e T6 = 100 kg ha-1 de N. Em T6, a aplica o de nitrog那nio foi todo na semeadura. Nos demais, exceto T1, parte do N (ur谷ia) foi aplicado na semeadura e a outra em cobertura no est芍dio V4. O delineamento experimental utilizado foram blocos casualizados. Foram avaliados: 赤ndice de 芍rea foliar, mat谷ria seca de folha popula o final, os componentes de produ o e os teores foliares de N, P, K, Ca, Mg, Cu, Zn, e Mn. Observaram-se diferen as entre os tratamentos para o conte迆do de mat谷ria seca de folhas, 赤ndice de 芍rea foliar, n迆mero de vagens por planta, produtividade e para os teores foliares de N, P, Ca, Mg e Cu. Para a popula o final, o n迆mero de gr os por vagem, a massa de 100 gr os e para os teores foliares de K, Zn e Mn,n o foram observadas diferen as. Nitrogen fertilization management in non-tillage systems is very important, and the response to its application depends on the appliednitrogen rate as well as the time of application. The objective of this work was to determine the responses of bean crops to different nitrogen dosages and application methods in nontillage. Treatments were carried out as follows: T1 = 0; T2 = 20 + 30; T3 = 40 + 60; T4= 60 + 90; T5 = 80 + 120 e T6 =100 kg ha-1 of N. Nitrogen application in T6 was done during sowing. In the other treatments, except T1, part of the N (urea) was applied during sowing and the other part at coverage, during the V4 stage. The randomized blocks experimental design was applied. N, P, K, Ca, Mg, Cu, Zn and Mn productioncomponents, leaf area index, dry matter of leaves, final population and foliar content were evaluated. Significant differences were found among leaf dry matter content, leaf area index, number of pods per plant, yield and foliar content for N, P, Ca, Mg and Cu. However, final population, number of grains per pod, hundred grain mass, as well as K, Zn and Mn foliar content showed no significant differences.