Vinasse and tebuthiuron application to sugarcane soil and its effects on bacterial community and ecotoxicity after natural attenuation
International Journal of Development Research
Vinasse and tebuthiuron application to sugarcane soil and its effects on bacterial community and ecotoxicity after natural attenuation
Received 02nd May, 2019; Received in revised form 09th June, 2019; Accepted 26th July, 2019; Published online 28th August, 2019
Copyright © 2019, Mírian Alves de Faria et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Soil fertility and weed control are fundamental factors for vinasse and herbicide applications in sugarcane crops, however environmental damage can be caused by their continuous and increasing use. Therefore, the present study aimed to analyze the changes in microbial community and ecotoxicological potential of sugarcane soil for different associations of vinasse and tebuthiuron. The experimental design was completely randomized in a factorial scheme 4x2, linked to vinasse volume (V0-0,5-1,0-2,0) and to tebuthiuron recommended dose (H0-1). Thus, different soil samples were analyzed in two periods (initial time and after 51 days of natural attenuation) for the number of bacterial CFU and the phytotoxic effect by ecotoxicity bioassays using lettuce seeds as test organism. Initially, results revealed that vinasse presence increased the number of bacterial colonies in soil, especially when used at higher concentrations. Higher volumes of vinasse also favored plant development at initial time. On the other hand, this benefit was reduced after natural attenuation. Finally, it was found that tebuthiuron dose did not negatively impact the bacterial community or soil ecotoxicity.
