Teores de P, Cu e Zn em solos a partir da aplicação de dejetos líquidos de suínos em diferentes sistemas de uso

Abstract

Pig production has grown systematically in Brazil, both for domestic consumption and for export. Santa Catarina is the state of the largest production in the country, which generates concerns of environmental organs due to the large amount of waste that is generated and that require treatments to be released, where one of the cheapest options for the use of these wastes is its use as agricultural fertilizer. The present work aims to evaluate whether the use of these wastes interferes with the levels of Cu, Zn and P. For the accomplishment of the work, soil was collected in the Sub-basin Lajeado Clarimundo, located in Concordia -SC, in different systems of land use at a depth of 10 cm, they were divided into 3 sub-samples where each of them represented a field repetition. The chemical analyses of available and total Cu and Zn, and P in water and Melich-1 were performed at the Universidade Federal da Fronteira Sul, Chapecó campus. Crops had higher P contents in Mehlich-1 and water, as well as higher cu contents available. In total Cu and Zn, reforestation using waste showed higher levels of these metals, and the lowest P contents in both Mehlich-1 and water were found in forest. Total Cu and Zn had lower concentrations in reforestation without the use of waste. Cu obtained very high levels with risks in environmental pollution, exceeding the 200 mg/kg proposed by the Ministry of the Environment. The results show that in fact the use of swine liquid manure influences the P, Cu and Zn contents resulting in nutrient accumulation.