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该文旨在研究20%氰氟草酯WP对水稻直播田禾本科杂草的防控效果和应用安全性,为水稻直播田草害的化学防控提供依据。在大田试验中采取4种浓度的20%氰氟草酯WP和100 g/L氰氟草酯EC对水稻直播田千金子、稗草等禾本科杂草的防除效果进行了测定,且对水稻的增产效果和安全性进行了分析。20%氰氟草酯WP对水稻直播田千金子、稗草等禾本科杂草具有良好的防除效果,有效成分用量90~150 g/hm~2对千金子防效在90.7%以上,对禾本科杂草的综合防效均在86.7%以上,与对照药剂100 g/L氰氟草酯EC基本一致。且20%氰氟草酯WP对直播田水稻高度安全,施药后能提高水稻产量,增产幅度为10.18%~11.22%。20%氰氟草酯WP可作为水稻直播田防除千金子的特效药剂,有着良好的应用前景。
The aim of this paper is to study the control effect and application safety of 20% Cyhalofop-butyl WP on weeds in direct-seeded rice fields, and provide the basis for the chemical control of direct seeding weeds in rice. In field experiments, four concentrations of 20% Cyhalofop-methyl WP and 100 g / L Cyhalofop-ethyl EC were used to control the weeds in the direct seeding fields, The yield increase and safety were analyzed. 20% Cyhalofop-butyl WP has the good effect of controlling the weeds such as Aegilops tauschii, barnyardgrass and other weeds in direct seeding rice. The effective amount of 90 ~ 150 g / hm ~ 2 is over 90.7% The comprehensive weed control effect was above 86.7%, which was basically consistent with the control agent 100 g / L Cyhalofop-butyl EC. Moreover, 20% Cyhalofop-butyl WP was highly safe to direct-seeded rice. After application, the yield of rice increased by 10.18% -11.22%. 20% Cyhalofop-butyl WP can be used as rice's direct-seeding anti-Qianjin special effects agents, has a good application prospects.