草铵膦在转基因抗除草剂杂交稻直播栽培中的应用效果

以转基因抗除草剂杂交早稻“株1S／Bar68—1”为材料，常规除草剂2次除草方式为对照，探讨了草铵膦1次除草方式在水稻直播栽培中的应用效果。结果表明：与常规除草（效果表现为千金子草害）相比，灭生性除草剂草铵膦除草对供试材料株叶形态无显著影响，但使田间杂草数量减少85．3％，减少产量损失33．1％，节约成本37．5％。“株1S!Bar68—1”直播栽培中应用草铵膦除草剂1次除草的技术要点为：草铵膦有效成分0．6g／L，每公顷用量720—960L（有效成分剂量432～576g／hm2），于分蘖末期紧挨冠层均匀喷雾，冒头杂草重点喷施。

Application Effect of Glufosinate in Direct Seeding Cultivation of Transgenic Herbicide Resistant Hybrid Rice

The weed control effect of glufosinate in direct seeding field of transgenic herbicide resistant early hybrid rice Zhu 1 S/Bar68 - 1 was studied with conventional herbicide as control. The results indicated that the plant type of hybrid rice was not obviously ＇affected, but the stems of weed were decreased by 85.3%, the grain yield loss was decreased by 33. 1% and the weeding cost was decreased by 37.5% in treatment of spraying glufosinate once compared to control. The key techniques of weed control by glufosinate on direct seeding rice included that the dosage of glufosinate was 432 - 576 g （a. i. ）/hnl2 and the glufosinate should be sprayed close to rice canopy at the end of tillering stage.