ESTOQUE DE NUTRIENTES EM CONSÓRCIOS DE Eucalyptus urograndis, Acacia mearnsii E Zea mays

Abstract

This study aimed to determine the nutrient pool in monospecific and mixed stands of Eucalyptus urograndis and Acacia mearnsii in a consortium with Zea mays.The amount determination of nutrients of forest species was carried out in the treatments: 100E (100% of eucalypt); 100A (100% of black wattle) and 50E:50A (50% of eucalypt + 50% of black-wattle). On the other hand, for corn, it was carried out in all treatments (100E; 100A, 50E:50A; 75E:25A – 75% of eucalypt + 25% black-wattle and 25E:75A – 25% of eucalypt + 75% of black wattle). The experiment was conducted in a randomized block with three replications. The magnitude of the nutrient pool in the agrossilvicultural systems biomass was: N> K > Ca > Mg > P > S, for macronutrients, and Mn > Fe > Zn > B > Cu, for micronutrients. Due to the great export of nutrients through the corn harvest, residues should be kept and it is necessary to make a nutritional reposition, mainly with P, N, K, S and Zn in the following crops, because of the higher amount that are exported with the extraction of the corn cob, which reaches 75.3; 60.6; 59.9; 55.8 e 53.8%, respectively, in relation to the total stocked in the biomass.