Selection of species tolerant to the herbicide sulfentrazone with potential for phytoremediation of contaminated soils

Abstract

This paper aimed to select species with potential for phytoremediation of soils contaminated with the herbicide sulfentrazone. Eight species were evaluated: Arachis pintoi, Eleusine coracana, Crotalaria spectabilis, Crotalaria ochroleuca, Cajanus cajan, Leucaena leucocephala, Stizolobium cinereum, and Raphanus sativus. The experiment was set-up inside a greenhouse, using pots with a capacity of 6dm 3 filled with soil samples collected at a depth of 0-20cm. The experimental design was arranged into randomised blocks in a factorial scheme (8 × 5) with four replications, which consisted of the combination between the species and five doses of sulfentrazone (0, 200, 400, 800, and 1,600g ha -1 ). The herbicide phytotoxicity, plant heights, and dry masses of shoots and roots were evaluated. The species Cajanus cajan and Leucaena leucocephala had a higher tolerance to sulfentrazone up to a dose of 400g ha -1 , showing minor symptoms of phytotoxicity and smaller decreases in plant heights and in dry matter accumulation, both in the shoots and roots, when compared to the control treatment, indicating, thus, the potential to be used for further studies on phytoremediation of sulfentrazone in soil.

Effect of population density of Canavalia ensiformis on the phytoremediation of soil contaminated with sulfentrazone

“…ADR7010), distribuindo-se 15 sementes por vaso. O milheto foi utilizado com base em sua elevada suscetibilidade ao sulfentrazone, comprovada em experimentos anteriores (MADALÃO et al, 2012). Após a emergência da planta bioindicadora, foi realizado o desbaste deixando-se duas plantas de milheto por vaso.…”

“…Dentre as espécies de adubos verdes selecionadas com potencial para fitorremediação do sulfentrazone, Crotalaria juncea e Canavalia ensiformis (MADALÃO et al, 2012), assim como Helianthus annus, Canavalia ensiformis, Dolichos lab lab e Arachis hypogaea (BELO et al, 2011) estão entre as que apresentam maior tolerância a esse herbicida.…”

Selection of tolerant species to imazapic for potential use in phytoremediation

“…The selection of tolerant species was based on the method proposed by Madalão et al (2012) in which the used species were described in the literature as tolerant to the herbicide, or then reported as phytoremediation agents of other herbicides from the same chemical group, in addition to the preference for species with agricultural and/or economic value. A test trial was set up for each vegetal species, which were the Urochloa decumbens ("capim-braquiária" or signal grass), Urochloa brizantha cv.…”

“…There was also a positive correlation between the increased absorption of this herbicide and the higher dry matter production in C. ensiformis. According to Madalão et al (2012), the selection of species tolerant to the herbicide to be removed and that produce a large biomass amount are requirements for the phytoremediation efficiency (Madalão et al, 2012).…”