GLUFOSINATE-RESISTANT, BAR-TRANSFORMED RICE (ORYZA-SATIVA) AND RED RICE (ORYZA-SATIVA) RESPONSE TO GLUFOSINATE ALONE AND IN MIXTURES

Glufosinate applied postemergence alone and in mixture with pendimetha lin, thiobencarb, quinclorac, propanil, bensulfuron, bentazon, acifluo rfen, or triclopyr was evaluated on bialaphos-resistant (BAR) rice and red rice in field studies. Glufosinate at 2.2 kg ai/ha alone was less phytotoxic (6%) to BAR-transformed rice than when it was applied in c ombination with 0.4 kg ai/ha triclopyr (59%) or 0.6 kg ai/ha acifluorf en (22%). Rice yield with glufosinate alone was similar to the weed-fr ee check the first year but 13% less than the weed-free check the seco nd year. For the glufosinate plus triclopyr mixture, rice yield was re duced by 39 and 76% compared with glufosinate alone in 1994 and 1995, respectively. Red rice control was 92% with either 3.4 ka ai/ha propan il or 0.6 kg/ha acifluorfen mixed with 0.6 kg/ha glufosinate, which wa s greater than for glufosinate alone and the other combinations. Propa nil or acifluorfen mixed with glufosinate reduced red rice plant heigh t, panicle maturity, and 100-seed weight 16, 31, and 24%, respectively , compared to glufosinate alone and 30, 48, and 43%, respectively, com pared to tile nontreated weedy check.