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COMPACTION OF AN ALBAQUALF UNDER TILLAGE SYSTEMS

The soil compaction induced by different tillage systems may limit the crop yield of wetlands soils. The objective of this research was to quantify the bulk density and the total porosity of an Albaqualf under different tillage systems (no tillage, minimum tillage, conventional tillage and pre-germinated tillage), in an experimental design of randomized blocks. The sampling was realized in 32 plots, being two random sites by plot and two depths (0.00-0.10 m and 0.10- 0.20 m), totaling 128 samples. After saturated in water and equilibrated in the potential (ψ) of -60 kPa, the samples were weighted and dried at 105 o C during 24 hours. The results indicated that the bulk density was significantly larger in pre-germinated tillage than no tillage, in surface layer The bulk density was significantly related with the total porosity, specifically with the soil microporosity, in the different tillage systems.