The swine production in southern Brazil is concentrated in small farms that use residues as a nutrient source for crops of economic interest. This study aimed to evaluate the use of swine slurry associated with tillage systems on double-cropped oat/maize. The experiment was carried out in the 2009/2010 and 2010/2011 cropping seasons, in Taquaruçu do Sul, Rio Grande do Sul State, Brazil. The experimental design was randomized blocks in a factorial scheme, with four replications. Treatments consisted of the interaction of four swine slurry doses (no swine slurry, 20 m³ ha-1, 40 m³ ha-1 and 80 m³ ha-1) and mineral fertilization, in three tillage systems (no-tillage, chiseling and chiseling + disking). The swine slurry application on doublecropped oat/maize increased the dry matter and grain yield. The 80 m³ ha-1 dose provided a response statistically similar to the mineral fertilization recommended for maize. The interaction between the 80 m³ ha-1 dose and the immediate incorporation of slurry into the soil reduced N losses by ammonia volatilization, promoting a significant increase in maize grain yield, when grown on a clayish soil.
Zea mays L.; Avena strigosa Schreb; Avena sativa L.
