Utilização de dejetos líquidos de suínos na adubação da cana-de-açúcar

Abstract

The present research was conducted at Fazenda Porto Alfenas-MG with purpose of determining the effect of doses of liquid swine dejections on sugarcane productivity and concentration of nutrient in the soil Two types of fertilization were tested in a second-cut sugarcane plantation variety SP 81-3250 in dark red dystrophic latosoil (LVEd): (1) liquid dejections of swines were used in the doses of 0 40 80 120 160 and 200 m³/ha and applied all at once and (2) conventional chemical fertilization The research design was the randomized blocks with four repetitions For comparison averages the SISVAR program and Scott-Knott test were used The harvest was made one year after the experiment implantation The agricultural productivity and technology quality of sugarcane were determined The dose of 40 m³/ha was equivalent to chemical manuring while the others showed 76,5% - 96,3% higher productivity when compared to the witness plantation (58,10t/ha) No statistical difference was found with regard to the technological quality of stalks The liquid swine dejections provided significant increases in the sugarcane stalk productivity without jeopardizing the technological quality The concentration of nutrients in the soil was observed after the harvest No differences were observed the concentrations of phosphorus calcium copper zinc and organic matter The concentrations of magnesium and potassium changed in the 0 20 and 20 40 cm layers of the soil