Atributos químicos nos sistema silvipastoril após três anos de aplicação de água residuária

Abstract

The reuse of wastewater, from the biochemical processes of natural constituents of organisms in agriculture today, seeks to improve the properties of the soil. In this sense, the work was conducted at Fazenda Bonsucesso, Uberlândia, MG, with the objective to evaluate the chemical attributes of wastewater in the silvopastoral system in soil depth: 0-20cm, 20-40 cm, 40-60cm. The experimental design was of completely randomized blocks, with a total of five treatments with five blocks. The treatments were divided in 4 doses of swine wastewater (ARS): 200, 470 and 800 m3 ha-1 ano-1

, and a treatment without the application of ARS, spacing used in the planting of Corymbia citriodora in double lines were 2 meters between plants in the row over 3 meters between rows and 15 meters between the double lines. The lines of the Corymbia citriodora remained of Urochloa decumbens pasture. The depth influences the percentage of Mg2+

in relation to

CEC total, and at a depth of 0 - 20 is the highest values. The content of Ca2+

in the soil is influenced by the ARS, and the dose between 400 to 600 m3 ha-1 year-1 promotes the reduction of this nutrient in the silvopastoral system with Corymbia citriodora and Urochloa decumbens. The dose of 200 m3 ha-1 year-1 of swine wastewater would be enough to provide adequate levels for the majority of the nutrients. The application of ARS possibly need complementation with fertilization of mineral origin and/or soil correctives.