Glufosinate Tank-Mix Combinations in Glufosinate-Resistant Rice (Oryza sativa)1

At 14 d after treatment (DAT), glufosinate at 0.42 kg ai/ha controlled barnyardgrass and broadleaf signalgrass 85 and 86%, respectively. Antagonism occurred for barnyardgrass control with all mixtures of glufosinate at 0.42 kg/ha. At 14 DAT, no herbicide was superior to glufosinate at either rate when applied in mixture for the control of broadleaf signalgrass. Rice flatsedge control 7 DAT was 68 and 82% with glufosinate at 0.42 and 0.84 kg/ha alone, respectively. The addition of propanil and triclopyr enhanced rice flatsedge control over that with glufosinate alone at 0.42 or 0.84 kg/ha. At 7 DAT, all herbicide mixtures increased spreading dayflower control compared with a single treatment of glufosinate at 0.42 kg/ha. By 28 DAT, spreading dayflower control was less than 80% with all treatments. Rice injury was less than 15% with all treatments.Nomenclature: Glufosinate; propanil; triclopyr; barnyardgrass, Echinochloa crus-galli (L.) Beauv. #3 ECHCG; broadleaf signalgrass, Bracharia platyphylla (Griseb.) Nash # BRAPP; rice flatsedge, Cyperus iria L. # CYPCP; spreading dayflower, Commelina diffusa Burm. f. # COMDI; rice, Oryza sativa L. ‘BNGL HC-11’, ‘BNGL-62’.Additional index words: Antagonism, synergism, tank mix.Abbreviations: DAT, days after treatment; POST, postemergence.