Demanda de tração e propriedades físicas de um Argissolo em diferentes manejos e intensidades de tráfego

Abstract

The objective of this work was to evaluate the effect of traffic intensity and soil management on the draught demand of a fertilizer furrow-opener, and on the physical properties of a Hapludalf. Treatments were: no-tillage with natural traffic, no-tillage with traffic intensity of 24.79 Mg km ha-1, no-tillage with traffic intensity of 49.59 Mg km ha-1, minimum tillage and minimum tillage in compacted soil with 24.67 Mg km ha-1. Data were collected for: total porosity; bulk density; penetration resistance; and for horizontal, vertical and draught forces demanded from the fertilizer planters. The subsoiling of minimum tillage used as an isolated technique did not reduce the compaction effects by a traffic intensity of 24,67 Mg km ha-1. The traffic changes the soil structure but not the draught requirement. The changes in its intensity from 24.79 to 49.59 Mg km ha-1 does not further affect in the evaluated properties.