Aplicação de água residuária de suínos no sistema silvipastoril

Abstract

Brazil is the fourth largest pork producer in the world, with a growing international insertion, earning more than US $ 1 billion per year, reaching 3% of production and 11% of world exports. With the increase in swine production, we also have an increase in the production of swine wastewater (ARS), which, when handled poorly, may contain a high potential for environmental pollution. The objective of this work was to evaluate the influence of the application of different doses of swine wastewater intercropped with citriodora, on the chemical properties of the soil, on the concentrations of macro and micronutrients in an area implanted with silvopastoral system. The work was carried out at Fazenda Bonsucesso, on the Campo Florido Km 20 highway, located in the city of Uberlândia-MG. The planting of Corymbia citriodora seedlings was carried out in double rows, with a spacing of 2 meters between plants and 3 meters between rows and 15 meters between double rows. The experimental plots were 10 meters long, containing 5 plants in each simple line, totaling 10 plants in the plot, by 6 meters wide, with an area of 60 m2, where the treatments were applied. The treatments used were five doses of ARS (0; 200; 400; 600 and 800 m³ ha-1) with five replications. The applications of ARS doses were split in June, July and August 2015. The chemical characteristics of the soil were evaluated, in layers 0-20, 20-40 and 40-60 cm deep. A randomized block design was used in an arrangement of subdivided plots, with the ARS doses being the plots and the depth the subplot. Analysis of variance with regression test and Tukey was performed using the Sisvar statistical program (FERREIRA, 2010). The application of swine wastewater in depth promotes an increase in the Cu content in the dose of 400 and 800 m3 ha-1 year-1. At the depth of 0-20 there was a higher concentration of micronutrients. Swine wastewater did not influence the increase in macronutrients in the third year of application. There was an increase in the levels of K, Mg and Ca that tend to increase in the coming years, in relation to the beginning of the experiment.