Estratégias de agricultura de precisão para definição de zonas de manejo em sistemas de integração lavoura pecuária

Abstract

The Precision Agriculture is a great tool to assist and enhance the spatial and temporal management of agricultural activities. In this sense the site-specific management, provides an understanding of agricultural crops or livestock on smaller spatial scales than those adopted in conventional agriculture. For data acquisition and obtaining maps, the Electrical Conductivity of the soil, the Penetration Resistance and Chemical Analysis of the Soil were used because they are variables which correlate with factors for grain production. This study evaluated the data obtained in a reference unit of Embrapa, submitted to a system of long-term crop-livestock integration succeeded by soybean cultivation during the summer and ryegrass pasture during the winter. The data on variability obtained on soybean yield, were used to establish management zones in pasture productivity, along with the (EC), (PR) and (CAS). From the values of correlation between soybean yield and forage production presented, it was observed that there was a positive correlation between the productivity of soybean and the forage production, only in the first cut of the forage. This result demonstrates that the response in productivity of different crops is distinct in the same area. Considering the results, it is concluded that the EC measures showed good repeatability, with a strong positive correlation with relatively small scattering. On the other hand, the areas of EC were not effective to determine the areas of management in the pasture phase, still fitting complementary studies to verify the efficiency of the EC in relation to variability in pasture productivity in southern Brazil.