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

Abstract

ABSTRACT: 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, Paraná 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(tm) (375 mL.ha-1), Orobor N1(tm) (75 mL.ha-1), LI 700(tm) (150 mL.ha-1) and TA 35(tm) (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(tm) and Orobor N1(tm) has been significantly higher than the effectiveness of these herbicides associated with LI 700(tm) and TA 35(tm), there were no significant differences among the treatments in terms of selectivity and grains yield of the rice cultivar Epagri 108.