大豆田后茬作物对金豆残留的药害反应

Phytotoxicity Reaction of Succeeding Crops on Imazamox Residue in Soybean Field

1996～ 1999年田间小区试验结果表明 ,大豆田使用不同剂量的金豆 12个月和 2 4个月后 ,小麦、玉米、油莱、甜莱、白菜等作物对土壤中残留的金豆有不同程度的反应。低剂量 (40、6 0ga.i./hm2 )下 ,施药后 12个月对小麦、玉米、油菜、甜菜和白菜等作物的出苗、生长和产量均无明显影响。 80、12 0ga .i./hm2 高剂量施药 12个月后 ,小麦无明显药害症状 ,油菜和甜菜的株高、株鲜重和产量均低于不施药对照区 ;12 0 ga i /hm2 处理区中 ,玉米和白菜有药害表现 ,株高和株鲜重明显低于不施药对照区。施药后 2 4个月 ,上述作物均无明显的药害反应。

The field trial on effect of imazamox residues in soil on succeeding crops were conducted during 1996～1999.The results showed that suceeding crops had different reaction on imazamox residues in soil.Rape,beet and Chinese cabbage were more sensitive than wheat and corn.Under lower dosages of 40g a.i/ha and 60g a.i/ha,all succeeding crops in this test had no phytotoxicity reaction to imazamox residues in soil after 12 and 24 months.However,the growth or yield of the crop (rape,beet,Chinese cabbage)was affected in different degree when the dosages were higher at 80g a.i./ha.and 120 g a.i./ha after applying 12 months.There were no distinct phytotoxicity reaction observed after 24 months to wheat,corn,rape,beet and Chinese cabbage.