Control of globe fringerush ( Fimbristylis miliacea ) and selectivity to rice crop irrigated with bispyribac-sodium + metsulfuron-methyl associated with adjuvants

This study aimed to evaluate the control of globe fringerush (Fimbristylis miliacea) and selectivity to rice crop irrigated with an in-tank mixture of bispyribac-sodium + metsulfuron-methyl associated with adjuvants. The experiment was conducted in the municipality of Douradina, Parana state, Brazil (23o12’32.0” South, 53o17’39.9” West), in the agricultural year of 2012/2013. An experimental randomized complete block design with ten treatments and four replications was used. The treatments consisted of applying an in-tank mixture of the herbicides bispyribac-sodium + metsulfuron-methyl at two doses (32+1.3 and 40+3.3  g  ai  ha-1) associated with the adjuvants Iharaguen™ (375 mL.ha-1), Orobor N1™ (75 mL.ha-1), LI 700™ (150 mL.ha-1) and TA 35™ (50 mL.ha-1), as well as weeded and unweeded control. Although the effectiveness of globe fringerush (F. miliacea) control with the in-tank mixture of the herbicides bispyribac-sodium + metsulfuron-methyl associated with Iharaguen™ and Orobor N1™ has been significantly higher than the effectiveness of these herbicides associated with LI 700™ and TA 35™, there were no significant differences among the treatments in terms of selectivity and grains yield of the rice cultivar Epagri 108.