Lodo de curtume na composição de substratos para produção de mudas de reflorestamento

Abstract

The use of tannery sludge in agriculture represents an alternative disposal of this waste sustainably This study aims to evaluate the use of tannery sludge as a component of commercial substrate, to produce seedlings for reforestation of four native species (Angico red and white, and mutamba mastic) and an exotic (eucalyptus). In this study the incorporation of five doses (5, 10, 15, 20 and 25%) Slurry commercial tannery in a substrate used for the growth of different plant species suitable for reforestation. The experiment was conducted in greenhouse seedling growth. After seeding in substrate packaged in tubes, according to each treatment, was accompanied on plant development, for 120 days, with periodic assessments of height and final evaluation of biomass (roots and shoots) in plants, as was also the levels of macro and micronutrients and accumulation of chromium in the leaf tissue. Of the five forest species assessed three (mastic, mutamba and eucalyptus) responded positively to the addition of up to 25% of tannery sludge in commercial substrate for seedling production. There were significant adjustments by the regression analysis for the absorption of phosphorus, boron and manganese from the incorporation of the residue in most species evaluated. Occurred phyto-extraction of chromium substrate with significant linear fit in three forest species evaluated.