Estratégia para recuperação de área de mineração da bentonita: composto orgânico no crescimento inicial de arbóreas nativas.

Abstract

Mining is a human activity that has been practiced since antiquity but causes environmental changes in soil and vegetation. In Cariri state of Paraíba, the exploitation of bentonite is of great socioeconomic importance and is characterized by the soil decapitation originating a large volume of soil, with high CTC but with low content of organic matter and accumulated in the area of plowing. The objective of this research was to evaluate the contribution of the organic compound to the initial growth of native species cultivated in topsoil of mining. The research was conducted in two stages: one in the nursery and the other in the field. In the nursery, doses of organic compound (0.0 - 5 - 15 and 25% v / v) were applied to the topsoil by studying the initial growth of the craibeira (Tabebuia aurea), jureminha (Desmanthus virgatus) e pau ferro (Caesalpinia ferrea) by evaluating the height and diameter for 105 days. Then the seedlings were planted in the field, quantifying the same variables for 120 days. In the nursery and in the field the compound increased the height and diameter of the Caesalpinia ferrea, Tabebuia aurea and Desmanthus virgatus, mainly at 105 and 120 days of sowing and planting, respectively.