Compacta??o de solos cultivados com cana-de-a?úcar: I -modelagem e quantifica??o da compacta??o adicional após as opera??es de colheita

摘要

The mechanized harvesting of sugarcane when accomplished in times of crop where the soil meets the inappropriate water contents has been responsible for soil compaction and reduction of yield in subsequent cycles of the crop. This study aimed to evaluate the effect of the harvesting operations of sugarcane at different times of the crop on preconsolidation pressure in a Red-Yellow Latosol (LVA) and in a Haplic Cambisol (CX). Mechanized harvesting traffic consisted of two passes of a sugarcane harvester and tractor + sugarcane transfer in each interrow of the culture. Undisturbed soil samples were used to determine the soil bearing capacity models and quantification of soil compaction due to mechanical harvesting in the months of November 2005, March and August 2006, and manual harvesting without traffic, in March 2006, because it is a time of greater rainfall intensity. The percentage of soil samples, in the region where additional soil compaction occurs, indicated that the CX was more resistant to compaction than the LVA. A mechanized harvesting of sugarcane being held in the friability zone caused soil compaction while the harvest accomplished manually did not cause the same effect.