Comportamento de genótipos de feijoeiro em latossolo vermelho distroférrico típico com diferentes graus de compactação

Abstract

Aiming to compare the behavior of four common bean genotypes at different soil compaction conditions, two field experiments were carried in the spring-summer 98/99, summer - fall/98 sowing seasons, in an Oxisol of the experimental area of UFLA Department of Agriculture. The experimental design was randomized blocks with four replications and 6 x 4 factorial scheme, involving six levels of soil density (1.08; 1.24; 1.36; 1.39; 1.41 and 1.50g.cm-3) and four bean genotypes (Carioca and Pérola cultivars and ESAL 550 and CI-128 lineages). It was adopted the spacing of 0.50 m among rows, with 16 seeds per meter. For soil fertilization, a 4-14-8 formulation was applied at 500 Kg.ha-1 before sowing, and 30 kg.ha-1 of N, as ammonium sulfate, was applied 25 days after emergency. The initial and final stands, the grain yield and its components (pods number per plant, grains number per pod and one hundred grains mass) were evaluated. The increasing soil compaction degrees reduced the number of plants and the grain yield according to a linear model, independently of seasons and genotypes. The CI-128 lineage was the most productive genotype in the summer-fall season and was a good genotype in the spring-summer sowing season.