40%三甲苯草酮水分散粒剂对稻茬麦田杂草的防效及小麦的安全性

Efficacy of Tralkoxydim 40% WDG and Its Selectivity to Wheat in Fields with Rice Stubble

田间小区试验验证40%三甲苯草酮水分散粒剂(water dispersible granule,简称WDG)对稻茬麦田杂草的防效及其对小麦的安全性。结果表明,在越冬前期(禾本科杂草2叶期)施用40%三甲苯草酮水分散粒剂100~200 g/667m2或在早春(禾本科杂草4叶期)施用40%三甲苯草酮水分散粒剂150~200 g/667 m2,宁麦13的株高、茎蘖数、理论产量与人工除草处理无显著差异,对小麦安全;越冬前期施用40%三甲苯草酮水分散粒剂100~200 g/667 m2对禾本科杂草的防效均高于92%,早春施用40%三甲苯草酮水分散粒剂150~200 g/667 m2对禾本科杂草防效均高于93%。相同剂量条件下,在越冬前期施用40%三甲苯草酮WDG对禾本科杂草的防效高于年后早春施药。

The efficacy and selectivity of tralkoxydim 40%WDG in wheat with rice stubble was investigated.Tralkoxydim 40%WDG sprayed at 100~200 g/667 m 2 during early winter(2 leaves stage of grassy weeds)or at 150~200 g/667 m 2 in early spring(4 leaves stage of grassy weeds)did not affect plant height,tiller number,effective panicle number,grain number per panicle and theoretical whear grain yield(Ningmai 13)compared to manual weeding,therefore being safe to wheat.At 100~200 g/667 m 2 tralkoxydim applied before winter provided higher than 92%control of grass weeds and above 93%when sprayed at 150~200 g/667 m 2 during early spring.The efficacy of tralkoxydim 40%WDG against grassy weeds applied before winter was higher than when applied during early spring at the same doses.