Efeitos da aplicação de dejetos suínos nas propriedades do solo e na infiltração de água

Abstract

When applied to agricultural areas, liquid pig manure (LPM) can improve soil structure by increasing organic matter content and nutrient availability. On the other hand, when applied indiscriminately, it can cause contamination of soil and water resources. In this context, this study aimed to evaluate the effects on chemical, physical and water attributes of soil resulting from the application of pig liquid manure (LPM). Two areas were evaluated in this research: área 1 (treatment 1) - area where LPM is not applied; area 2 (treatment 2) - area where LPM has been applied to the soil for three years. For the physical characterization of the soil, data on texture, moisture, particle density, soil bulk density and total porosity were analyzed. For the chemical characterization of the soil, analyses of pH, organic matter, H+Al, P, K, Ca, Mg, Na, SB, CTC and V% were performed. A double-ring infiltrometer was used to determine water infiltration into the soil. Infiltration rates were also estimated and compared using the Horton, Kostiakov and Kostiakov-Lewis models. Treatment 2 showed a higher average water infiltration rate in the soil, in addition to higher levels of organic matter, moisture, K. However, this treatment resulted in a more acidic soil, with a lower pH and a higher H+Al value when compared to treatment 1. Significant statistical differences were found between the two treatments for the parameters pH, H+Al, K, SB, V, Mg and organic matter. Regarding soil water infiltration models, in treatment 1 the model that stood out was the Kostiakov-Lewis, while for treatment 2 the Kostiakov model presented the best results.