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The management of soil variability from the advent of precision agriculture, has become widespread in agricultural areas. The change of some chemical or physical soil attributes, especially in areas of irrigation systems can result in lost of productivity and nutrients. This study evaluates spatially the physical-chemical characteristics of the soil in the central pivot area and relates it to a corn crop yield. The area of 56 ha belongs to a private farm of Mr. Norberto Hullman located in Inhacora, RS, Brazil. 56 soil samples were collected in the 0-0.1 m layer, and other 56 in the 0.1-0.2 m layer, following a grid sampling of 1 ha. Soil analyses were performed for each sampling point, which also performed the evaluation of resistance to the soil penetration. Corn yield was also evaluated at the end of the cropping cycle on the same points. Highest yield values were measured at locations with highest organic matter indexes, phosphorus and potassium. The highest corn yield values presented significant (p = 0.0001) relation with exchangeable potassium in the CTC for the 0.1-0.2 m layer.

AGRICULTURA DE PRECISÃO: VARIABILIDADE DOS ATRIBUTOS QUÍMICO-FÍSICOS DO SOLO E RELAÇÃO COM A PRODUTIVIDADE DO MILHO