CRESCIMENTO E NUTRIÇÃO MINERAL DO SORGO GRANÍFERO APÓS ADUBAÇÃO ORGÂNICA E CULTIVO DA BATATA

Abstract

The effect of residual organic fertilization is an essencial tool for maintaining the sustainability of soil fertility in the semi-arid region. This study objectives assess the effect of residual organic fertilization on the income of mass drought and absorption of nutrient by sorghum grown in Entisol which for six years has received application of caprine manure or green fertilization with crotalaria and cultivated with potato (Solanum tuberosum L.). In the cultivation of potato annually the treatments consisted of planting and incorporation of the Crotalaria juncea L. at the time of flowering (C); addition of 15 t ha-1 of caprine manure (E); Planting and incorporation of crotalaria + 7,5 t ha-1 manure (CE); and witness without crotalaria or manure (T) with four repetitions. The treatments receiving application of manure provided the largest accumulations of N, P and K by sorghum. The effect of residual organic fertilization favored larger increase in the production of dry sorghum in the crops first and second. The annual organic fertilization of potato increased the levels of P and K in the soil swappable which influenced the growth of sorghum in subsequent cultivation. The manure shows high potential to be used as organic fertilizer in the region. However the planting and the incorporation of biomass of crotalaria without the addition of manure in addition to nitrogen not contributed the nutrient content of soil.