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摘要
O objetivo foi avaliar a intera o entre palhadas e doses de nitrog那nio, na nutri o e rendimento de gr os do feijoeiro, sob plantio direto. O delineamento foi de blocos casualizados, com quatro repeti es, em esquema de parcelas subdivididas. As palhadas influenciaram o teor de Fe e as doses de N os teores de N, Ca, Mg e Mn. Houve intera o entre palhadas e doses para os teores de P, K e S. O maior teor foliar de Fe ocorreu sob palhada de guandu-an o e de N na dose de 62 kg ha-1 do nutriente. Para os teores de Ca, Mg e Mn, houve respostas lineares, sendo negativa para o Ca e positivas para os dois 迆ltimos. Para o P, houve pequena redu o, com posterior acr谷scimo nas palhadas de milheto e milheto+feij o-de-porco. Os teores de K aumentaram at谷 pr車ximo de 50 kg ha-1 de N, com posterior redu o sob as palhadas de milheto consorciado com as leguminosas.Nas palhadas de milheto e guandu-an o, houve redu o a partir de pequenas doses de N. Os teores de S aumentaram de forma quadr芍tica nas palhadas com milheto. O maior rendimento foi obtido sob milheto+feij o-de-porco na maior dose de N. The object was to evaluate the dry bean nutrient contents and grain yield in no-till. The study was carried out in a randomized block design, and four replications, with a split-plot arrangement. The dry bean macro and micronutrients contents and grain yield were determined. The straws significantly influenced Fe content, while nitrogen fertilization levels influenced N, Ca, Mg and Mn contents. There were significant interactions between straws and the rate of N for P, K and S contents. The greatest dry bean Fe foliar content was observed under dwarfguandu straw. N contents increased until the rate of 62 kg ha-1 N, and experienced reduction after that level. The N rates provided linear effects in Ca, Mg and Mn contents, being negative for Ca and positive for the others. P contents had little reduction with increases in millet and millet+jack-bean straws. K contents increased until rates near 50 kg ha-1, with reduction after that level under all the straws with millet presence. Under milletand dwarf-guandu straws, the reduction occurred starting at small N rates. S contents increased quadratically, only under straws where millet was present. The best grain yield was obtained under millet+jack bean in the largest N rate.
