Marlo Adriano Bison Pinto

Aplicação de dejeto líquido de suínos e manejo do solo na sucessão aveia/milho

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 Taquarucu 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 m 3 ha -1 , 40 m 3 ha -1 and 80 m 3 ha -1 ) and mineral fertilization, in three tillage systems (no-tillage, chiseling and chiseling + disking). The swine slurry application on double-cropped oat/maize increased the dry matter and grain yield. The 80 m 3 ha -1 dose provided a response statistically similar to the mineral fertilization recommended for maize. The interaction between the 80 m 3 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 .

Pig slurry as a nutrient source in wheat/corn succession

Wheat and corn are important grains in the agricultural scenario of Brazil, and demand adequate supply of nutrients, particularly nitrogen, in crop succession. The use of pig slurry (PS) as a full and/or partial alternative to mineral fertilization in crop areas has been identified as an important alternative for the disposal of this waste. Therefore, the objective of this study was to evaluate the utilization of PS as fertilizer in wheat/corn succession under some plant parameters and grain yield. The experiment was conducted under field in randomized block design with four replications and five treatments, three with PS (40, 80, 160 m³ ha-1) and two controls (no fertilization and mineral NPK fertilization), which were applied manually in the soil shortly after sowing the crops. The application of PS proved to be a significant source of nutrients in wheat/corn succession. In comparison to NPK fertilization, this increase was only of 5.4% and 4.7% for wheat and corn, respectively. PS is an efficient alternative and it can be used as a source of these nutrients in wheat/corn succession, and the use of 80 m3ha-1 provides satisfactory results for all evaluated variables.