Physico-hydrical attibutes of a soil cultivated with raygrass (Lollium multiflorum. L.) pasture under different combinations of prepare and treatment.

Abstract

This work aimed to evaluate the different combinations of prepares and soil treatment (calcareous and organic and/or mineral fertilizer) in the physico-hydrical attributes of Argissolo Amarelo Distrófico típico, located in Capão do Leão, RS. The deformed and not deformed samples were collected, in triplicate, in each plot of an experiment cultivated with ray grass pasture in no-tillage system. The evaluated treatments were: T1-calcareous and fertilizer absence, T2-Calcareous humus, T3-NPK+calcareous, T4-Calcareous, T5-Humus and T6-Húmus+P+calcareous. The used humus was obtained from vermicompost of bovine manure. The following features were evaluated: soil density, macro and micro porosity, total porosity, organic matter, water retention, available and stored water. According to the results there was no statistical difference for the variables density, micro porosity, macro porosity, total porosity and available water. However, the treatments showed unacceptable rates of gaseous diffusion (< 0.10m3 m3) for macro porosity. The organic matter contents were larger in the treatments T2 (calcareous Humus) and T5 (Humus), but without differing significantly in the treatments T3 (NPK+calcareous) and T6 (Humus+P+calcareous). The biggest change for the retention curves was observed in the treatment 1 (calcareous and fertilizer absence). This can be related to the possible effect of the different fertilizers in the soil physical characteristics. For the stored water the different treatments showed significant differences.