Dry bean in no till system in different nitrogen levels and under straws / Diferentes palhadas e doses de nitrogÃnio no plantio direto do feijoeiro. / Dry bean in no till system in different nitrogen levels and under straws / Diferentes palhadas e doses de nitrogÃnio no plantio direto do feijoeiro.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

This study was conduced to evaluate biomass yield and nutrient accumulations in millet (Pennisetum typhoides (Burm.) Stapf), jack bean (Canavalia ensiformes (L.) DC.) and guandu (Cajanus cajan, dwarf cultivar), and also intercropping millet + leguminous and their effects on dry bean at different nitrogen fertilization levels. Two phases were used in this study. The first one was settled the experiment using cover plants, in a randomized block design, and four replications. Only guandu presented smaller fresh and dry biomass yield than other treatments. In generally N, P, K e S accumulation was similar to biomass yield. Greatest Ca accumulation was observed with single jack bean. Greatest Mg accumulation was observed in jack bean and millet singles and their intercropping. Single jack bean and its intercropping with millet gave largest B accumulation. Greatest Cu, Mn and Zn accumulation was observed at single millet and its intercropping combinations, and largest Fe accumulation was observed also, at millet at single system and intercropped with jack bean. On the second phase dry bean was sowed under the straws using the same first phase design, including nitrogen levels in split plot arrangement. Millet straw provided greatest dry bean stand. Jack bean single and intercropped provided the largest hundred-grain weight. Nitrogen rate provided negative linear effect for initial stand, and positive effect in hundred-grain weight. Grain number per pod increased until 106 kg.ha-1 N rate and had little reduction after that. There were significant interactions between straws and N rate for plant height, pod per plant and grain yield. Millet + jack bean provided greatest plant height at 115 kg.ha-1 N rate. Pod number per plant had linear and positive effect in all straw types and the greatest values was observed in intercropping combinations in the maximum N rate. The best grain yield was obtained under millet + jack bean in the largest N rate.

ASSUNTO(S)

planta de cobertura nitrogÃnio feijÃo nitrogen bean plantio direto fitotecnia cover plants till system

ACESSO AO ARTIGO

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