Salinização e toxicidez do solo em sistema silvipastoril com aplicação de água residuária de suinocultura

Abstract

Pig confinement stands out as a large swine wastewater generator (ARS). The final destination of these wastes is a concern of society, since if they are handled improperly, they can cause serious impacts to the environment. One of the alternatives is the use of ARS as a source of nutrients, which after the mineralization of organic matter, are made available to the plants. The objective of this work was to compare soil chemical attributes under two planting arrangements, in single and double lines of Corymbia citriodora. The experiment was carried out at the Bonsucesso farm in Uberlândia - MG, Brazil, in two arrangements, the first one with citriodora in single lines, with five plants per plot, spacing two meters between plants and 15 meters between rows. The second was citriodora in double lines, two meters between plants in the line, three meters between lines in the plot and 15 meters between double lines of citriodora. The statistical design was in randomized blocks. The treatments used were five doses of ARS (0; 200; 400; 600 and 800 m³ ha-1) with five replicates. The application of ARS rates were divided in the dry season, in June, July and August. The chemical characteristics of the soil were evaluated in the 0-20 cm depth layer. Planting on double lines of citriodora provided higher nutrient contents in the soil. The application of swine wastewater raised the levels of potassium and heavy metals such as copper and zinc. The dose of 200 m3 ha-1 provided adequate levels for most nutrients present in the soil.