40%灭草松·唑草酮水分散粒剂防除水稻直播田莎草及阔叶杂草的效果

Sedge and Broadleaf Weed Control Effects of Bentazone· Carfentrazone-ethyl 40% WG in Direct Seeding Paddy Fields

【目的】明确40％灭草松·唑草酮WG对水稻直播田莎草及阔叶杂草的防除效果、使用剂量、使用适期及安全性。【方法】分别于施药后7、15、30d调查杂草株数、杂草鲜质量、水稻安全性，水稻成熟后测产。【结果】在水稻5叶期，杂草3—5叶期，施用40％灭草松。唑草酮wG用量为600—720ga．i．／hm2，防除效果显著，对水稻安全。【结论】在推荐使用剂量内对水稻直播田莎草及阔叶杂草的防除效果显著，对水稻安全，是一种理想的水稻直播田除草剂。

[Aims] The aim of this study is to determine the control efficacy of bentazone＂ carfentrazone-ethyl 40% WG on sedge and broadleaf weeds, optimal dosage, suitable period and to investigate the rice safety in direct seeding paddy fields. [Methods] The weed trees, weed flesh weight, cultivated rice safety were investigated on 7, 15, 30 d after treatment. [Results] The results showed that bentazone＂ carfentrazone-ethyl 40% WG displayed significant control effect on the broadleaf weeds （Sphcnoclea zeylanica L., Ludwigia prostrata） and sedge weeds （Fimbristylis miliacea L. Vahl） at recommended dose of 600-720 g a.i./ha of at 5 leaf stage office and 3-5 leaf stage of weed and it is safe on rice. [Conclusions] Bentazone carfentrazone-ethy140% WG is safe on rice with good efficacy on broadleaf weeds and sedge weeds at recommended dose, which is an ideal herbicide in the direct seeding paddy fields.