Revista Brasileira De Herbicidas 2015; 14(3): 210-219
Selectivity of fomesafen and clomazone associated with other herbicides applied in preemergence of cotton plant
A field experiment was conducted in Santa Helena de Goiás to evaluate the selectivity of herbicides fomesafen and clomazone and other combinations to cotton plants when applied in preemergence. The experiment was conducted in a randomized block design in a split plot design with four replications. The assessed herbicide treatments were: clomazone, clomazone + fomesafen (0.45 kg ha-1 of a.i.), clomazone + fomesafen (0.625 kg ha-1 of a.i.), clomazone + fomesafen + diuron, clomazone + fomesafen + prometryn, clomazone + fomesafen + trifluralin and clomazone + fomesafen + s-metolachlor. The visual symptoms of phytotoxicity were seen up to the evaluation of 19 days after emergence, and generally the injuries were higher where it was associated with three herbicides in the application. The treatments with clomazone alone and the associations clomazone + fomesafen (1.0 + 0.45 kg ha-1 of a.i.), clomazone + fomesafen + diuron, clomazone + fomesafen + prometryn, clomazone + fomesafen + trifluralin and clomazone + fomesafen + s-metolachlor were selective to cotton plant. The highest dose of fomesafen (0.625 kg ha-1 of a.i.) in associations with clomazone (1.0 kg ha-1 of a.i.) was not selective to cotton plant (cultivar DP 555 BG RR and in a clayey textured soil, with 3.1% of OM and pH of 6.0).
Keywords: chemical control; Gossypium hirsutum r Latifolia; tank mix
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