Acúmulo de matéria seca e macronutrientes em diferentes órgãos de cultivares de feijoeiro em função de populações de plantas e ambientes de cultivo

Abstract

Aiming the study of the accumulation, distribution and extraction of dry matter and nutrients in four common bean cultivars under different population densities, under conventional and non-tillage systems were conducted four field experiments with cvs. Bolinha (type II), Jalo EEP 558 (III), BRS Radiante (I) and Ouro Vermelho (II / III). Conducted in Lavras (season: spring-summer 2006/2007), the experiments were complete block randomized design with three replications and a split-plot, and the plots were the two environments, no-tillage environment (1) and conventional (room 2) and in the sub-plot, 5x8 factorial, involving five population densities and eight collection dates. At each sampling five plants were sampled, separating the parts of plants in the stem, leaves, flowers + pods and grains, for determination of dry matter and accumulation of macronutrients. Data were subjected to analysis of variance and regression, with adjustment of representing curves of the behavior of those features. The cycle of cultivars Bolinha Jalo EEP 558 and developed to 73 DAE in both cropping systems. The BRS Radiant arrived at 73 DAE in environment 2, while in the environment 1 had a shortened cycle, at 63 DAE, the shortest among cultivars. The cultivar Ouro Vermelho reached 83 DAE in both environments. The total accumulation of DM showed cumulatively during the crop cycle. Accumulations of N, P, K, Ca, Mg and S were presented in a similar way to clumps of DM in the four cultivars. The decreasing accumulation order of the nutrients, average of four cultivars, was different in leaves (N> Ca> K> Mg> P> S), pods (K> N> Ca> Mg> P> S), grains (N> K> P> Ca> Mg> S) and total (N> K> Ca> Mg> P> S).