The distribution soil particle-size has a narrow relationship with the nutrients and water holding capacity and influences plant yield. The purpose was to study the variability and linear and spatial correlations among plant and soil attributes. A sampling grid to collect soil and plant data was installed with one hundred and twenty five sampling points in an area of 2500 m². The forage yield of autumnal corn (CPF) in no-tillage and irrigated systems, the contents of soil sand (SA), silt (SI), and clay (CL), at the depths 1 (0,00-0,10 m), 2 (0,10-0,20 m), and 3 (0,20-0,30 m), in a Haplic Acrustox of Bonança Farm at Pereira Barreto County, Sao Paulo State, Brazil, were analyzed in the agricultural year of 2005. The studied attributes showed median to low variability, with excellent spatial performances, and ranges between 8,5 and 46,8 meters. Oppositely, the linear correlations between CPF and soil attributes were low. There was appreciable spatial correlation between CPF and clay of the 0,20-0,30 m (CL3).
soil physical attributes; particle-size distribution; no-tillage; crop forage
