Abstract
Most of the alkaline soils of the Flooding Pampa (Argentina) are suffering severe structural deterioration, due to grazing on its natural vegetation. Because of the classical reclamation by chemical means has very restricted possibilities, soil improvement was studied by the exclusion of grazing. The study was performed in a Typic Natraqualf and conducted in a 3 years old enclosure, a 12 years old enclosure and the surrounding grazed area. Most of the studied soil parameters: total and water-soluble organic matter, structural stability, bulk density, hydraulic conductivity, infiltration rate, and the water easily dispersed fraction were not significantly different among the treatments. The soil of the enclosure did not accumulate soil organic matter and an important proportion of it was still water soluble. The absence of trampling, even after cattle exclusion for 12 years, did not improve the soil structural stability, clay dispersion and other properties. Sodium removal and flocculation would be a prerequisite for improvement of those sodic soils.
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