不同药剂对直播稻田杂草的防效和安全性研究.doc

不同药剂对直播稻田杂草的防效和安全性研究


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　　摘要 为探索25 g/L氯氟吡啶酯乳油在推荐剂量下，防除直播水稻田杂草效果、杀草谱、安全性及施药技术等指标，采取茎叶喷雾施药、定期调查的方法进行田间药效试验。结果表明，氯氟吡啶酯杀草谱主要包括禾本科杂草、阔叶杂草及莎草科杂草，但对千金子无效;施药时间为直播水稻四至六叶期，推荐剂量为15～30 g/hm2，施药后25 d对阔叶杂草综合防除效果达100%，与氰氟草酯混合使用，对千金子防效更好。建议在直播稻四至六叶期，25 g/～ g/hm2+100 g/L氰氟草酯乳油100～150 g/hm2混合喷施可以有效防除直播稻田杂草危害，且对水稻生长安全。
　　关键词 氯氟吡啶酯;直播稻;杂草;安全性;推荐剂量
　　中图分类号 文献标识码 A
　　文章编号 1007-5739（2020）14-0086-02
　　Abstract In order to explore the indexes of 25 g/L florpyrauxifen EC at recommended dose in direct seeding rice field such as weed control effect， herbicidal spectrum， safety and application technology， this experiment was carried out by means of stems-leaves spray and regular survey. The results showed that the herbicidal spectrum of florpyrauxifen included grass weed， broad-leave and sedge weed， but it was ineffective to Leptochloa chinensis （L.） Ness; the suitable application time was at 4-6 leaf stage of direct seeding rice， the recommended dose was 15-30 g/hm2， the comprehensive control effect on broad-leave weed reached 100% after 25 days， the control effect was better with cyhalofop-butyl in combination. It was recommended that at the 4-6 leaf stage of direct seeding rice， 25 g/L florpyrauxifen EC 22