ABSTRACT:
Phytoremediation is a technique that has been used with increasing frequency to decontaminate soils treated with herbicides that have long-term residual effects, such as sulfentrazone. The goal was to assess phytoremediation of the herbicide sulfentrazone under field conditions by the species Canavalia ensiformis and Crotalaria juncea. The treatments consisted of combinations of the plant species C. ensiformis and C. juncea plus a control treatment (with manual weeding) and four doses of the herbicide sulfentrazone. The experimental design used herein was a split-plot randomized block design with four replicates per subplot. The treatments were kept in the field for 75 days. After this period, the experimental area was again furrowed and fertilized, considering the requirements for Pennisetum glaucum, a plant used as an indicator of the presence of sulfentrazone. Thirty-four days after sowing pearl millet, the fresh and dry shoot masses of the plants were assessed. At the end of the cycle, the plant height, stem diameter, internode length, number of leaves, number of panicles, and fresh and dry panicle masses were determined. Previous cultivation of phytoremediation species C. ensiformis and C. juncea promotes sulfentrazone remediation. C. ensiformis is the most efficient species for the decontamination of the herbicide sulfentrazone under field conditions.
Keywords:
Green manure; Canavalia ensiformis; Crotalaria juncea; Soil decontamination; Crop succession.
