Responsabilidad del peso y la presión en la compactación de suelos labrados. Parte II: cama de siembra.

Abstract

Low trafficability and high compactability characterizes a soil where secondary tillage was done in order to prepare a seedbed profile. In spite of low values of traffic intensity needed during seeding operations, severe damages could be done incrementing soil compaction in the profile. In a wheel/soil system of its characteristics tests were leaded to measure the distribution of soil compaction with depth. Three depth ranges were considered: topsoil (0 to 150 mm) and subsoil (0 to 300 and 300 to 600 mm). A conventional 2WD tractor was used making only one pass over a Tipic argiudoll (Soil Taxonomy 1994), clayly loam textured. Four wheel sizes with two weight conditions each one were used. The bulk density was measured using a nuclear gammametric gauge. Considering topsoil level, all the treatments induced significant values of soil compaction, as compared to the control plot without traffic. If subsoil levels are considered, treatments with ballasted condition induced the higher increments in bulk density.