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[目的]50%二氯喹啉酸WP在我国稻烟轮作区稻田中多有使用,对后茬烟草有明显的药害,尚无可靠的解毒技术,迫切需要筛选50%二氯喹啉酸WP的替代药剂。[方法]选择22%苄·乙WP、25 g/L五氟磺草胺OF、38%苄·二氯WP等3种除草剂作为替代药剂与50%二氯喹啉酸WP一同用于稻田,调查杂草生长情况,对水稻进行了测产且比较了用药成本。[结果]22%苄·乙WP的除草效果、水稻产量均未达到50%二氯喹啉酸WP同等水平,用药劳动强度大,不宜作为替代药剂;38%苄·二氯WP杂草防治效果与50%二氯喹啉酸WP相当,水稻产量高于50%二氯喹啉酸WP处理,虽可以降低50%二氯喹啉酸WP的药害风险,考虑到烟草对50%二氯喹啉酸WP高度敏感,38%苄·二氯WP亦不宜作为替代药剂;25 g/L五氟磺草胺OF的除草效果、产量优于50%二氯喹啉酸WP,且易降解。[结论]25 g/L五氟磺草胺OF作替代药剂用于稻烟轮作区稻田杂草防治,可以解决50%二氯喹啉酸WP对后茬烟草的药害问题。
[Objective] 50% quinclorac WP was used more in paddy rice fields in China. It had obvious phytotoxicity to the stubble tobacco and there was no reliable detoxification technology. Therefore, it is urgent to screen 50% quinclorac WP Alternative medicine. [Method] With three kinds of herbicides as 22% Benzyl-B-WP, 25 g / L Penoxsulam OF and 38% Benzyl-Dichloro-WP as alternative agents and 50% Weed growth was investigated, rice production was measured and the cost of medication was compared. [Result] The herbicidal effect of 22% Benzyl-B-WP and the rice yield did not reach 50%. The quinclorac was equally WP, and the labor intensity was high and should not be used as substitute. The control effect of 38% 50% quinclorac WP, rice yield higher than 50% Quinclorac WP treatment can reduce the risk of phytotoxicity of 50% quinclorac WP, considering that tobacco is highly sensitive to 50% quinclorac WP , 38% benzyl dichloride WP is also not suitable as an alternative medicine; 25 g / L Penoxsulam OF weeding effect, yield better than 50% quinclorac WP, and easy to degrade. [Conclusion] The application of 25 g / L pentosalazine OF as substitute agent in weed control of rice paddy field could solve the problem of phytotoxicity of 50% quinclorac WP on the stubble tobacco.