Forrageiras na recuperação de áreas degradadas por arenização

Abstract

Degraded areas are places where were deleted componentes essential to maintain their ecological functions, which may facilitate the onset of arenization in sandy soils. The objective of this search is to evaluate and select forages for containment and recovery of degraded areas by arenization in town of Alegrete, in the state of Rio Grande do Sul. Furthermore, analyze the interference of Trichoderma spp. in the initial growth of forages. For this, the study was conducted in two parts: with experiments the field in town of Alegrete and in the laboratory of Plant Pathology and soil Microbiology of Federal University of Pampa. The experiments were_simultaneously and the difference was in the use of TI-2 isolate from Trichoderma spp. for the experiments in the laboratory. Were used four winter forages: Avena sativa, Avena strigosa, Lolium multiflorum, Lupinus albescens, sown in two soils: sandy soil no vegetation cover and sandy soil with vegetation cover in process of arenization of Alegrete. The evaluation consisted of emergence percentage of aerial part of the plant length of forages. Thus, the forages presented emergence and growth in greenhouse using soil in the area of process of arenization, but did not show the same result in the field. The fungus Trichoderma spp. stimulated the growth of aerial part of Lolium multiflorum and root length in Avena sativa. However, the way the experiment was conducted the forages may not be suitable for containment and recovery of degraded areas by arenization in the city Alegrete.