The aim of this study was to evaluate the yield and concentrations of nutrients in soil and corn plant in response to fertilization with different doses of sewage sludge compost and Gafsa rock phosphate. The work was conducted at experimental area of the ICA/UFMG in a Haplic Cambisol. The treatments, in a factorial 2 x 4, corresponded to two rates of Gafsa rock phosphate (0 and 90 kg P2O5 ha-1) and four rates of sewage sludge compost (0, 25, 50 and 75 t ha-1, on dry basis). The experimental design was randomized blocks, with three replications. In general, the corn yield and the concentrations of macronutrients in soil and plant were not influenced by fertilization with Gafsa rock phosphate. However, corn yield and nitrogen, phosphorus, potassium, calcium and sulfur concentration in the soil and nitrogen, phosphorus and potassium concentration in leaf increased with the addition of sewage sludge compost to soil, being the optimal recommended rate of 75 t ha-1.
Zea mays; biosolids; reactive phosphate rock
