Effects of 10% Bispyribac Sodium SC on Weed Control and Rice Yield in Direct Seeding Rice Field

Field trials of safety and weed control effect of 10% bispyribac sodium(Nominee) SC were conducted respectively in direct sowing early-rice and semilate-rice fields. Its weed-preventing and eliminating effect is good for barnyard grass, Monochoria vaginalis, Lindernia procumbens, Rotala indica, Cyperus difformis and other weeds, with no chemical injury to rice plants. It suggests that the dosage of Nominee's main active ingredient should be 22.5~30.0g/hm2 for the weed control in direct sowing rice field. At 3-leaf stage of rice and/or 2~4-leaf stage of weed, the stem-leaf spray control effect is the optimum.