Uso do protetor de sementes dietholate em gramíneas forrageiras

Abstract

Control of narrow leaf weeds is still a major challenge for cattle ranchers, mainly because there are still no herbicides available to control weeds such as grasses. A possible solution to this problem would be to renew the pasture and use some product that provides protection against the action of herbicides graminicidas at the time of sowing of the fodder, denominated of "safeners". The objective of this work was to evaluate the possibility of using the dietholate protector in the treatment of seeds in the species Brachiaria brizantha (Hochst.) Stapf., Brachiaria humidicola (Rendle.) Schweickerdt, Brachiaria ruziziensis (R. Germ & Evrard), Panicum maximum Jacq cv. Mombasa and Panicum maximum Jacq cv. Massai. Two experiments were carried out, the first one being carried out in the Seeds Laboratory of the Federal University of Goiás, Jataí Regional, evaluating the effect of the protector dietholate on the germination parameters of the evaluated species. And the second experiment was conducted in the municipality of Barra do Garças, at the experimental farm of the Federal University of Mato Grosso, where the use of dietholate as protector of the herbicide Clomazone was evaluated. The dietholate provided protective effect in doses up to 1200 mL of dietholate 100 kg-1 of seeds for the species Brachiaria brizantha cv. Marandú, Brachiaria humidicola and Brachiaria ruziziensis. However, doses above 800 mL of dietholate 100 kg seed-1 affected the seed germination parameters of the Panicum maximum cv. Mombasa and Panicum maximum cv Massai. Although seed protection was observed, the doses of dietholate used were insufficient to prevent the deleterious effects of the herbicide clomazone.