Eficiência do resíduo de sisal para compostagem com estercos animais e farinha de rocha natural

Abstract

The present work aimed to evaluate the efficiency of sisal leaf residues, composted at different ratios with cow and sheep manures (mixed), poultry manure, and rock powder for obtaining a substrate to be used by the sisal crop itself and other crops. It should have potential to be used by the organic, biodynamic and conventional agricultural systems. In a first experiment, started at the Valente-Ba, eight treatments were defined and evaluated. The results had the following conclusions: the manures did not contribute to improve the nutrients of the compost, the compost from the residues is a organic fertilizer; the compost showed nutrients at the range accepted by the MAPA; the compost with only 100% sisal residues is a organic fertilizer; the composts had nutrients content at the range accepted by the MAPA. A followed up experiment carried out at the UFRB, in Cruz das Almas-Ba, aimed to test the nutritional capacity of the substrate through the cultivation of bean (Phaseolus vulgaris) and sorghum (Sorghum bicolor). This study showed that the compost was inefficient for the growth of the bean crop; the compost with RF70%+EF15%+FR15%, and RS70%+EF15%+FR15% showed better vegetative growth for the sorghum crop; the compost with RS70%+EM15%+FR15%, RF70%+EF15%+fr15%, RS70%+Ef15%+FR15%, and RS90%+FR10% were the best supplying nutrients for the sorghum crop.