Água residuária de suinocultura sobre a produtividade de soja e milho segunda safra: uso e viabilidade econômica

There is urgency in researches for recommendation doses, timing and methods of swine wastewater (SW) application, which is made up of organic waste and minerals, which can be absorbed by plants. The objective was to evaluate economic viability and the effect of swine wastewater associated with mineral fertilizer in succession soybean crop and second crop corn under no tillage system in Oxisol on West of Parana State, Brazil. From September 2013 to August 2014, an experiment was conducted with five doses of swine wastewater (0, 35, 70, 135 and 140 m 3 ha -1 yr -1 ), and two levels of mineral fertilizer (absence and presence). Treatments arranged in a completely randomized split-plot blocks with four replications, allocated to plots the factor doses of swine wastewater and the subplot factor mineral fertilizer. Biometric variables, yield and economic analysis from the net income of the soybean crop and second crop corn were evaluated. There was a linear increase in grain moisture content and in corn productivity in succession of soybean, fertilized with SW. The calculated dose that showed the highest rates of net revenues was treating as 70 m 3 ha -1 yr -1 , with R$ 3221.43 and R$ 3114.25 for distances of 5000 and 10000 meters, respectively.