室内试验结果表明 ,呋草黄在 6 0 0 ga.i./hm2 剂量下 ,对扁秆草的鲜重防效为 46 1% ;12 0 0 ga.i./hm2 剂量下鲜重防效为 82 2 % ,此剂量下水稻鲜重减少 35 3%。田间小区试验表明 ,在 12 0 0 ga .i./hm2 剂量下对扁秆草的株防效为 6 5 0 % ,鲜重防效仅为 40 8% ,而此剂量下药后40天观察 ,水稻已有轻微药害表现 ,株高稍矮于对照 The results of laboratory tests showed that the fresh weight control effect of forsythi on the flat grass was 46 1% at the dosage of 600 ga.i./hm2, and the fresh weight and heavy resistance was 12 000 ga.i./hm2 The effective rate was 82.2%, the fresh weight of rice decreased 35.3% at this dose. The field plot test showed that the control efficacy of the plant was 65.0% and the fresh weight was only 40.8% at the dose of 12 000 ga .i. / Hm2, while the observation of this dose 40 days after the administration Rice has a slight phytotoxicity performance, plant height slightly shorter than the control