REGRESSÃO QUADRÁTICA PARA TEORES DE ÁGUA EM FUNÇÃO DA COMPACTAÇÃO DO SOLO

Abstract

The work had an influence on the water content in the evaluation of mechanical strength. The experiment was carried out at the Lageado Farm of UNESP / FCA, Botucatu / SP, showing two classes of soil, clay dystroferric Red Nitrogen (NVd) with 50% clay content and textured Red Latosol (LV) medium, with 25% clay content. The experimental design was randomized, with the following compaction treatments: T0 = 0; T1 = 1; T2 = 2; T3 = 3; T4 = 5 and T5 = 10 consecutive passes of an agricultural tractor. Use of a hydraulic-electronic penetrometer for mechanical soil sampling. 0.10 to 0.20; 0.20 to 0.30; 0.30 to 0.40m in 4 hours of water content. With the increase of traffic, the greater the compaction. Responsible for the clayey soil, from a tractor pass the values ​​of the greatest distance pressure, not differing statistically for a more superficial layer (0-0,20m) and for a layer of 0.20-0,40m a from two passes. For the medium textured soil, it occurred from one pass to a more superficial layer (0-0.20m) and five passes to a layer of 0.20-0.40m.