The pig slurry can be used as an organic fertilizer but its improper use can contaminate water and soil. The objective of this study was to evaluate the effect of nutrient addition to the soil on pasture oat + ryegrass (Avena sativa + Lolium multiflorum) dry matter production and nutrient uptake. One experiment was carried out from 2004 to 2006, installed in the experimental farm of UTFPR in Pato Branco, Paraná State, Brazil. The soil was an Oxisol (Latossolo Vermelho distroférrico, Brazil systems). Different rates (0, 20, 40, 80 and 120m³ ha-1) of pig slurry were applied in the pasture. The pig slurry applications were performed 20 and 61 days after emergence (DAE) of pasture, in 2004, and 30 and 67DAE of pasture in 2005. Another two applications were performed in summer crops, corn in 2004 and soybean in 2005. In both years the rate 120m³ ha-1 of pig slurry resulted in the highest dry matter production. The nutrient uptake by plants responded in a linear manner to pig slurry application.
organic manure; soil fertility; pig slurry; environmental pollution
