Effect of the application of slaughterhouse wastewater treated on stabilization ponds on soil and corn development

Abstract

The objective was to evaluate effect of application in different doses of wastewater from slaughterhouse in  an Oxisoil and on corn development . The wastewater was collected after treatment in stabilization ponds. Doses of 150 m3 ha-1, 450 m3 ha-1, 900 m3 ha-1 and 1350 m3 ha-1 of wastewater were applied during the growing season of corn. It was used 12 columns of soil of 0.25 m in diameter and 0.65 m in height. The percolated material was analyzed at all doses and presented a reduction of the nitrogen parameters (Kjedhal) of 0.02 g L-1 and phosphorus of 0.1 mg L-1 in all treatments. At higher doses, 900 m3 ha-1, the potassium content was 12.08 mg L-1 and calcium and magnesium increased by 40% and 173% on average, respectively. It was observed a sodium reduction of 92% and there was reduction of BOD and COD. The plants that received the doses 450 m3 ha-1, 900 m3 ha-1 and 1350 m3 ha-1 presented higher values of green matter, length of spike and number of leaves. The soil fertility has not undergone dramatic changes with respect to the parameters analyzed.