Can sulfentrazone at mixtures be an alternative to control Conyza sumatrensis, Digitaria insularis and Commelina benghalensis in soybean?

Resumo

The application of herbicides, at pre-emergence of weeds and crops, is an effective and increasingly necessary strategy, due to the control difficulties, including herbicide-resistant weeds. Thus, aimed to evaluate the effectiveness of sulfentrazone, alone or in mixtures, applied in pre-emergence of soybean to control Sumatran fleabane (Conyza sumatrensis), sourgrass (Digitaria insularis) and Benghal dayflower (Commelina benghalensis). The number of weeds m⁻², weed control, crop injury, and soybean yield were evaluated. This research shows that mixtures with sulfentrazone are especially interesting, as with diclosulam and, metribuzin + imazethapyr, in the control of Sumatran fleabane, in which diuron tends to aggregate when combined. Sulfentrazone mixed with clomazone or metribuzin, plus diuron, are especially valid for Benghal dayflower. While some triple mixtures attract attention, in the control of sourgrass. The mixtures that tend to have a better control spectrum are: sulfentrazone + clomazone + diuron, and sulfentrazone + metribuzin + diuron. Therefore, the mixtures with sulfentrazone evaluated in the experimental conditions verified in this study, are promising in the integrated management of weeds and do not generate losses in soybean yield.