The residues of Canavalia ensiformis and Crotalaria juncea after phytoremediation in soil contaminated with sulfentrazone do not result in soil recontamination

Abstract

Phytoremediation is an alternative for the decontamination of areas that have received intense applications of herbicides. This study aimed to verify the reuse possibility of Canavalia ensiformis and Crotalaria juncea as green manure and the influence of the vegetation cover after phytoremediation of soil contaminated with sulfentrazone on the growth and development of Pennisetum glaucum. Two experiments were carried out in a greenhouse. One of the experiments was conducted with C. juncea and the other with C. ensiformis, two phytoremediation species of the sulfentrazone herbicide. The experiments were set up in 4 x 3 factorial, with the first factor being four population densities of the phytoremediate species (C. juncea -0, 60, 120 and 240 plants m -2 ; C. ensiformis -0, 10, 20 and 40 plants m -2 ), and the second composed by three sulfentrazone doses (0, 200 and 400 g ha -1 ). Seventy-five days after emergence (DAE), the plants were collected by separating the aerial parts and roots to determine the sulfentrazone accumulation in the plants by using high performance liquid chromatography. Plant extract was prepared from the vegetable material and applied in pots containing washed sand, followed by the sowing of the indicative plant (Pennisetum glaucum). It was evaluated as to its phytotoxicity plant height, aerial part and roots dry matter. P. glaucum cultivated in the substrate that received leaf extract from C. ensiformis and C. juncea cultivated in soils with presence of sulfentrazone did not display any intoxication symptom to this herbicide. The extracts from Canavalia ensiformis and Crotalaria juncea were not phytotoxic to the millet, indicating that these species can be used as green fertilization after phytoremediation of the sulfentrazone in the soil.A permanência de resíduos de Canavalia ensiformis e Crotalaria juncea após fitorremediação em solo contaminado com sulfentrazone não resulta em recontaminação do solo RESUMO: A fitorremediação é uma alternativa para a descontaminação de áreas que receberam intensas aplicações de herbicidas. Objetivou-se com esse estudo verificar a possibilidade de reutilização de Canavalia ensiformis e Crotalaria juncea como adubo verde e a influência da cobertura vegetal após fitorremediação de solo contaminado com sulfentrazone sobre o crescimento e desenvolvimento de Pennisetum glaucum. Foram realizados dois experimentos em casa-de-vegetação. Um dos experimentos foi conduzido com C. juncea e outro com C. ensiformis, duas espécies fitorremediadoras do herbicida sulfentrazone. Os experimentos foram montados em fatorial 4 x 3, sendo o primeiro fator quatro densidades populacionais das espécies fitorremediadoras (C. juncea -0, 60, 120 e 240 plantas m -2 ; C. ensiformis -0, 10, 20 e 40 plantas m -2 ) e o segundo três doses de sulfentrazone (0, 200 e 400 g ha -1 ). Setenta e cinco dias após a emergência (DAE) as plantas foram coletadas separando-se a parte aérea e a raiz para determinação da acumulação de sulfentrazone nas plantas por cromatografia líquida de alta eficiência....

Green Manure Species for Phytoremediation of Soil With Tebuthiuron and Vinasse

“…Cultivation of C. juncea slightly reduced sulfentrazone concentration in soil. Bioindicators of this herbicide then grew more consistently over time, regardless of sowing density, but not as consistent as control assay (Ferraço et al, 2019). reported phytoremediation benefits by Phaseolus vulgaris on the growth and development of Urochloa brizantha.…”