Fomesafen selectivity sprayed in preemergence of different cultivars of cotton

Abstract

There is an outstanding difference among cotton cultivar related to injury caused by herbicides applied in preemergence. This way, the present work was conduct in greenhouse with the objective to evaluate the effect of crescent doses to fomesafen about the initial growth to eight cotton cultivars. The experimental design utilized was the completely randomized, arranged in factorial design 8 x 6, with five replications. Evaluate the response of eight cotton cultivars (DP 555 BG RR, FMT 705, FMT 701, FM 910, FM 966 LL, FM 993, IMA CD 6001 LL e IMA 8221) to six doses to fomesafen herbicide (0, 125, 250, 375, 500 e 625 g ha-1 a.i.), applied in preemergence, after the sowing, that was realized in three centimeters of deep. The soil utilized was red Oxisol, pH of 5.9, 2.94% of M.O., 320 g kg-1 of clay and 600 g kg-1 of sand. The variables evaluated was phytointoxication percentage at 5, 10 and 20 days after application, besides to dry weight of shoot 30 days after application. Conclude that cotton cultivars response of the different way to fomesafen applied in preemergence. The cultivar most tolerant was FMT 705. The most sensible cultivars were IMA CD 6001 LL, FMT 701 and FM 993.