Mobilidade de nutrientes no solo com aplicação de água residuária de suinocultura, em um sistema agroflorestal

Abstract

Brazil is among the world's four largest producers and exporters of pork. The wastewater swine (WS), which despite being a pollutant, also has characteristics that allow its application in the soil as fertilizer, avoiding its accumulation in the property. The objective of this work was to evaluate the variation in soil chemical parameters up to 60 cm depth under different ARS doses in a silvopastoral system. The study was conducted at Bonsucesso farm, located in the county of Uberlândia-MG. The planting of Corymbia citriodora seedlings was arranged in double rows, spacing 2 meters between plants and 3 meters between rows and 15 meters between double rows. The experimental plots are 10 meters long, containing 5 plants in each single line, totaling 10 plants in the plot, 6 meters wide, with an area of 60 m2, where the treatments are being applied. The treatments used were five doses of WS (0; 200; 400; 600 and 800 m³ ha-1) with five replicates. The application of ARS rates were divided in June, July and August of 2015. The chemical characteristics of the soil were evaluated in the layers 0-20, 20-40 and 40-60 cm depth. A randomized complete block design was used in subdivided plots arrangement, with WS rates being plots and depth to subplot. Analysis of variance with regression and Tukey using the statistical program Sisvar (FERREIRA, 2010) was performed. The dose of 200 m3 ha-1 swine wastewater provided adequate soil contents for nutrients K, Na, Cu and Zn. There was leaching to the depth of 60 cm of K, Na, Cu and Zn. The Mg contents reduced in the soil with the application of swine waste water. ARS did not change soil pH and Ca contente.