The tolerance of green manure species to diclosulam can be used in crop rotation schemes aiming to reduce the subsequent phytotoxic effect of this herbicide on sensitive plants, such as sunflower or corn plants. This study evaluated the tolerance of green manure to diclosulan and the capacity of these plants in reducing the phytotoxic effect of this herbicide on Helianthus annuus (sunflower). Three rates of diclosulam (0; 0.035, and 0.070 kg a.i. ha-1) were evaluated under greenhouse conditions in pre-emergence of the following green manures: Dolichos lablab, Cajanus cajan, Canavalis ensiformis, Crotalaria juncea, C. breviflora, C. spectabilis, Mucuna deeringiana, M. cinerea, M. aterrima, Lupinus albus, Helianthus annuus, Pennisetum glaucum, Avena strigosa, Raphanus sativus and Calopogonium muconoides. C. cajan, C. ensiformis, M. cinerea, and M. aterrima were selected as the most tolerant ones, being evaluated in the field with diclosulan at the rates of 0, 0.035, and 0.070 kg a.i. ha-1 in a 4 x 3 factorial scheme, with four repetitions. The shoots of these plants were collected 60 days after emergence, and H. annuus was sown as bio indicator of diclosulam. The results showed that C. cajan was the most promising species to reduce the phytotoxic effect of diclosulam on susceptible cultures.
green manure; environmental impact; decontamination; plant selection; agrochemicals
