Spatial variability of penetration resistance and soil water content in Neossolo Flúvico

Abstract

The penetration resistance is a variable of great importance for agricultural management. The study was conducted
to evaluate the spatial variability of soil resistance to penetration (RP) and water content of Fluvent cultivated with carrot
and irrigated by micro sprinkler system, in Pesqueira, Pernambuco, under severe water stress scenario. The evaluations were
performed in the 0-0.20 and 0.20-0.40 m layer, at 49 points, a grid mesh with 7 m × 7 m on two consecutive days, called sample
1 and sample 2. The Normal distribution was verified in the variables penetration resistance, water content and texture. For
water content it was observed a nugget effect, while for the penetration resistance spherical model (0.00-0.20 m) was fitted, in
sampling 1, and the Gaussian model for the sampling 2. The kriging maps of the two samplings show reduced RP, probably due
to the increase in the water content, although it has not been observed a strong correlation between the two variables.