Effect of tillage on spatial structure of soil resistance in a typic Argiudoll from Argentina

ALESSO, C.A.; CIPRIOTTI, P.A.; IMHOFF, S.C.; LINGUETTI, C.G.; MASOLA, M.J.

Botucatu, Sao Paulo

Simposio; IV Simposio de Geo-estadística aplicada en Ciencias Agrarias; 2015

The horizontal spatial structure of soil resistance (SR) is known to be affected by tillage systems and machinery traffic, however there is a lack of quantitative information about the effect of tillage on spatial structure on vertical direction. Our aim was to assess the effect of the tillage on the spatial structure (horizontal and vertical) of SR in a Typic Argiudoll from Santa Fe (Argentina) previously managed under no till and to model the changes of SR considering the spatial auto-correlation when was relevant. SR was measured before and after chiseling on a 30x80 m area of a commercial field following a 5-m aligned grid on the horizontal plane and through the upper 40 cm layer at 2 cm increments with a soil compaction meter (3926 measurements at each sampling moment). Spatial structure was assessed by 2D and 1D variography. The tillage had no effect on the horizontal spatial structure of SR, but in the vertical plane the chiseling extended the range of spatial dependence as a result of the alteration of the soil structure. The inclusion of the vertical spatial structure in the estimation of global model allowed more accurate SR predictions by reducing the estimate error ca. 50%.