Resumo

ROSA, David Peres da et al. Draught requirement and physical properties in a Hapludalf at different management and traffic intensity levels . Pesq. agropec. bras. [online]. 2012, vol.47, n.1, pp. 118-126. ISSN 0100-204X.  http://dx.doi.org/10.1590/S0100-204X2012000100016.

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^-1no-tillage with traffic intensity of 49.59 Mg km^-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^-1The 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.

Palavras-chave : compaction; minimum tillage; soil density; soilstructure; no-tillage; subsoiling.