Aline de Souza Silva Cunha
Abstract:
Aimed to evaluate the protective effect of dietholate on selectivity herbicide clomazone in forage grasses (Urochloa brizantha cv. Marandu, Urochloa ruziziensis, Urochloa humidicola, Panicum maximum cv. Massai and Mombasa). The experimental design was randomized blocks and the treatments arranged in a 5 x 3 factorial scheme with four replications. The first factor corresponded to the doses of protector applied to the seeds (0, 600, 1,200, 2400 and 3000 mL 100 kg of seeds-1) and the second factor corresponded to the doses of the herbicide clomazone at 0, 720 and 1440 g ai ha-1. Visual injury levels at 7, 14 and 28 days after emergence (DAE), number of tillers and dry matter density (DVMS) were evaluated. Dietholate has protection against the phytotoxic effects of clomazone herbicide on Urochloa brizantha cv. Marandu, Urochloa humidicola and Urochloa ruziziensis at the doses of 600, 1,200 and 2,400 mL 100 kg-1 seeds. For Panicum maximum cv. Mombasa and Massai safener use exhibits protective activity mainly at doses of 600 and 1,200 mL 100 kg-1 seeds. Plant injury results indicate significant importance of dietholate as a seed protector for the use of clomazone herbicide in pasture areas.
