Viabilidade da utilização do biossólido associado com água residuária de suinocultura

Abstract

In view of the high consumption of water for irrigation purposes, it is necessary to develop studies aimed at the use of new water sources to supply water to crops. In this sense, the objective of the present study was to evaluate the chemical composition of the solution of a soil that received treated wastewater from pig farming after application of different doses of biosolid. The experiment was carried out in a greenhouse in eight-liter pots, following a randomized block design, in a 5x5 factorial scheme with four replications. The factors corresponded to the use of five proportions of treated swine wastewater and five doses of biosolids. After sixty days of wastewater application, soil samples were sent to the laboratory for extraction of the soil solution, where pH, electrical conductivity, and sodium, potassium, calcium, and magnesium contents were quantified. After obtaining the contents of the mentioned nutrients, the sodium adsorption ratio (RAS) was calculated. Through the results obtained, it was possible to verify that the use of biosolids together with wastewater reduced the pH of the soil solution. In turn, the values of electrical conductivity, calcium and magnesium contents increased. Sodium, potassium and RAS and PST values of the soil solution increased with increasing proportions of swine treated wastewater. Based on the data, it was concluded that the input of wastewater and biosolids improve the availability of nutrients to the soil, and that the application of biosolids mitigated the salinizing effect of swine wastewater.