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Eficiência de uso de nitrogênio em cobertura pelo feijoeiro irrigado The efficiency of use of nitrogen applied in top dressing in irrigated bean

By Edvaldo V. P. Sant'Ana, Alberto B. dos Santos and Pedro M. da Silveira

Abstract

Entre as técnicas de manejo necessárias para atingir alto potencial produtivo nos sistemas agrícolas irrigados, está a adubação nitrogenada. O objetivo deste trabalho foi avaliar os efeitos de doses de nitrogênio aplicadas em cobertura sobre a fitomassa e a eficiência de uso do nutriente pela cultivar BRS Horizonte de feijoeiro. O experimento foi conduzido na Embrapa Arroz e Feijão, em um Latossolo Vermelho distrófico, em delineamento experimental de blocos ao acaso, com quatro repetições e cinco doses de nitrogênio, 0, 30, 60, 120 e 240 kg ha-1, na forma de uréia, aplicadas em cobertura metade aos dez dias após a emergência (DAE) e a outra metade aos 17 DAE. A fitomassa no florescimento do feijoeiro relacionou-se linearmente com as doses de N aplicadas em cobertura, ao passo que a fitomassa na colheita apresentou resposta quadrática. As relações entre o índice de colheita de grãos e o índice de colheita de N com as doses de N foram quadráticas e os índices máximos foram estimados com a dose de 140 kg ha-1 de N. A eficiência de uso de nitrogênio pelo feijoeiro variou com as doses de N aplicadas e com o tipo de eficiência calculada, enquanto as eficiências agronômica e fisiológica diminuíram com o incremento da dose.<br>Nitrogen fertilization is one of the management techniques necessary to achieve high yield potential in irrigated agricultural systems. The objective of this study was to evaluate effects of nitrogen applied as topdressing on phytobiomass and nutrient use efficiency in dry bean cultivar BRS Horizonte. The experiment was conducted at the National Rice and Beans Research Center of Embrapa in a Distrophic Red Latosol in randomized block design with four replications. The nitrogen rates used were 0, 30, 60, 120 and 240 kg ha-1, half applied 10 days after plant emergence and half, 17 days after plant emergence in the form of urea. Dry bean phytobiomass was linearly related with N rate at flowering, while at harvest the response was quadratic. Relation between grain harvest index, nitrogen harvest index and N rate was quadratic and the maximum index was obtained at 140 kg N ha-1. Nitrogen use efficiency by dry bean varied with N rate applied and type of efficiency while agronomical and physiological efficiencies decreased with increase N rates

Topics: Phaseolus vulgaris, matéria seca, eficiência agronômica, eficiência fisiológica, Phaseolus vulgaris, dry matter, agronomic efficiency, physiological efficiency, Agriculture (General), S1-972, Agriculture, S, DOAJ:Agriculture (General), DOAJ:Agriculture and Food Sciences
Publisher: Universidade Federal de Campina Grande
Year: 2011
DOI identifier: 10.1590/S1415-43662011000500004
OAI identifier: oai:doaj.org/article:82bf6a2307d04dfb9aa797e0c9d6e671
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