Influência de Pterodon emarginatus Vogel sobre atributos físicos e químicos do solo e valor nutritivo de Brachiaria decumbens Stapf em sistema silvipastoril

Abstract

The search for alternatives for the main problems faced in the livestock that lead to the fall in the productivity of the forage, has become increasing in recent years, aiming at the balance between production and natural resources conservation. In this direction it was objectified to evaluate the White Sucupira trees’ area of influence in physical and chemical attributes of the ground and the quality of the forage in silvipastoril system. The study was carried through in the Gogó da Ema Farm, 4 km distant from the city of Nioaque - MS. The area studied, leased on a distrophic Red Latosol, is currently occupied with pasture of Brachiaria decumbens shaded by arboreal species where the White Sucupira predominates. Five trees represented by adult and healthy individuals had been chosen, in which transect lines had been traced leased the angles of 60° between one and another. Throughout these transects, to each five meters, had been centered the sampling parcels, until the distance of 30 meters. Over these parcels the sample collections of serrapilheira had been carried through, from the grassy and the ground. The chemical analyses of the fodder plant had consisted of: rude protein (PB), fiber in neutral detergent (FDN) and digestibility in vitro of the dry substance (DIVMS). The physical attributes of the ground had been studied: density, macroporosity, microporosity, total porosity and resistance to the penetration. The chemical attributes of the ground evaluated had been the exchangeable texts of magnesium, calcium, potassium and aluminum. The gotten data had been submitted to analyses of simple regressions and correlation of Pearson. It was concluded that: the organic substance of the sacking intervenes in a positive form on the physical attributes of the ground, promoting improvement in the structural quality of the ground; the shading caused by the White Sucupiras intervenes with the nutritional value of the signalgrass, therefore it makes possible the increase of rude protein and fiber in neutral detergent content, and reduces the digestibility in vitro of the dry substance.