Alterações químicas no solo em resposta ao uso de condicionadores para reflorestamento no semiárido

Abstract

The soil degradation is reaching a large proportion. Alternatives that enable the recovery of degraded soils in areas that are in the process of desertification are essential for the reforestation of semi-arid regions become effective. The use of soil conditioners in the recovery of degraded areas is an alternative to the better use of water and nutrients by plants to be established in these areas. It is assumed that increasing doses of hydrogel increases the percentage of mineral nitrogen (N) in soil, especially as ammonium (N-NH4 +). It is assumed also that the application of the hydrogel together with carnauba straw reduce the percentage of mineral N in the soil due to the immobilization. To prove these assumptions an experiment have been made in Triunfo farm, located in the municipality of Ibaretama (CE). In this study soil chemical properties were evaluated, especially the fractionation of mineral N in response to the hydrogel doses and application of carnauba straw. The experimental design was a randomized blocks (DBC) in a factorial scheme 4 x 2. For evaluation were analyzed four hydrogel doses (0, 4, 5 and 6 g liter -1 of water), with and without carnauba straw, distributed in five blocks that constituted the repetitions of the treatments. The analysis of soil and plant material were carried out, with a significant difference for N-NH4+ and Mn significant difference to the plant material n to the soil and no.