Biofertirrigação da cultura forrageira Brachiaria brizantha cv. Marandu com utilização de diferentes composições de água residuária de frigorífico de abate de bovinos no bioma cerrado

Abstract

The climate changes may have possibly caused impacts on the hydrological cycles, reducing the hydric availability for the anthropic activities, thus making it necessary the development of studies which may contribute to minimize the pressure of the demand over that natural resource. The productive chain of beef that is among the ones that requires the use of a lot of water is, at the same time, among the ones that pollute most, mainly, due to the disposal of effluents from then slaughtering industry, on the hydrous bodies. Seeking to mitigate those environment impacts and render the beef cattle raising in the Cerrado biome less predatory on the environment, this research proposes to evaluate the use of those effluent compositions in the system of the brachiaria brizantha cv Marandu grass planting on red-yellow Latolosso soil, as it occurs a lot in that biome. During the development of this work, simple samples of soil were collected before the preparation of the soil and after the handling of the biofertigation in the experimental area, with the intention of evaluating the behavior of the soil quality indicators, as well as the impact of that handling on the leaf biomass of the culture. It was found that in the mentioned environment, those residual compositions, within certain limits, present a positive correlation with the productivity of the dry mass (DM) of that culture, provided specially by the ecological roles developed by the soil microbiota. Hence, it was verified that this biomass expanded in a directly proportional way to the increase of the utilization of the residual compositions in the system of biofertigation handling, especially by the significant augmentation (p˂ 0,05) of the viable bacteria organisms, up to the depth of 20 cm.