Concentração de macronutrientes na parte aérea do feijoeiro (Phaseolus vulgaris L.) em função da compactação e classes de solos

Abstract

Root system physical and chemical impediments can restrict the nutrients absorption, resulting in low grain yield. The purpose of this work was to evaluate the effect of the different compaction degrees in the bean plant aerial part macronutrient concentration. The experiment was carried out in greenhouse at Depto. Agricultura/UFLA, from September to December of 1997. The experimental design was completely randomized with four replications and factorial arrangement, involving three types of soils (sandy and clay Red Yellow Latossol LVAd1 and LVAd2 respectively, and a clay Dusky Red Latossol - LVdf), five compaction degrees (50%, 62,5%, 75%, 87,5% and 100% of the maximun density) and two bean cultivars (Pérola and Aporé). Two bean plants per pot were cultivated, harvested at physiological maturity, and evaluated for the macronutrient concentration. The plant tissue concentrations of N, K and S, movable nutrients in the soil and subjects to the lixiviation, in general were Increased with the increase of the soil compaction degree. The plant tissue concentration of P, nutrient subject to the soil fixation, showed reduction with the increase of the soil compaction degree. The increasing compaction degrees reduced the growth of the bean plant. A all compaction degrees effects were differentiated at the three soil classes. The plant tissue concentration of P and Mg also were modified by the bean cultivar.