Phyto-stimulation by Stizolobium aterrimum as remediation of soil contaminated with trifloxysulfuron-sodium

This study aimed to evaluate the effect of microbiota associated to Stizolobium aterrimum rhizosphere on remediation of soil contaminated with trifloxysulfuron-sodium. The treatments were arranged in a factorial scheme 2x4 and consisted of samples of Stizolobium aterrimum rhizosphere soils cultivated for 60 days and non-rhizosphere or non-cultivated soil, all submitted to four contamination levels (0.0, 7.5, 37.5 and 375 9 ha(-1)).. Samples were incubated for 30 days in appropriate recipients to evaluate unfastening of CO2 by microbial respiration) and biomass carbon quantification. Bioremediation efficiency was verified by using the bioassay technique, using sorghum to indicate the presence of herbicide residue. The S. aterrimum rhizosphere soil treated with trifloxysulfuron-sodium showed higher biological activity, evidenced by higher unfastening of CO2.. Rhizosphere soil samples showed higher microbial biomass, regardless of herbicide presence. It was concluded that microbiota contributed to soil decontamination, since sorghum growth on the rhizosphere soil was similar with or without trifloxysulfuron-sodium, while it was inversely proportional to the herbicide dose in the non-rhizosphere soil.