Atributos químicos do solo em sistema silvipastoril após aplicação de água residuária de suinocultura

Abstract

Agroecosystems in an integrated crop-livestock-forest system are an opportunity to obtain productivity combined with sustainability. And if the use of residues, such as swine manure, can still be incorporated, the advancement of this technology becomes even more important. In this sense, the objective was to evaluate the chemical attributes of the soil after 4 years of swine wastewater application in an agroforestry system. The experiment of agroforestry systems with Corymbia citriodora in a double row with pastures between the rows of tree species was evaluated. The experiment was implemented and the system was qualitatively compared in relation to soil attributes. The design was randomized blocks with 4 replications. The treatments were 5 doses of swine wastewater: 0, 200, 400, 600 and 800 m³ ha-1 year-1. The dynamics of variations in soil chemical attributes were evaluated in the 0.0-0.20 layers; 0.20-0.40 and 0.40-0.60 m depth after 4 years of successive ARS applications. The successive applications of ARS provided the soil with an increase in nutrients in the first year of implantation, mainly in the most superficial layer of the soil. The application of ARS after four years in a silvopastoral system alters the nutrient content in the soil. Among the macronutrients, there was a reduction in P and Ca and maintained the levels of S and Mg. The K showed elevation. Among the micronutrients, the contents of Cu, Fe Mn and Zn increased, while the values of B remained stable. The doses of 600 m³ ha-1 showed greater accumulations for P and K, while the S had greater accumulation with the doses of 600 and 800 m³ ha-1. Cu, Fe and Zn presented high contents when submitted to a dosage of 600 m³ ha-1.