几种化学除草剂防除冬麦田杂草效果研究

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：esearch on control effects of several chemical herbicides on weeds in winter wheat field

ZHANG Xianfei1CHENG Wei1SHEN Huimei1CHEN Yijun2WEI Li2 ZUO Jun2 （1Shanghai Agricultural Technology Extension Service Center， Shanghai 2O11O3， China； 2Shanghai Shangshi Agricultural Development Co.，Ltd.， Shanghai 202183， China）

AbstractTo screen for eficient and safepre-emergence soil-applied herbicides suitable for winter wheat fields， an evaluation was conducted on the weed control efficacy and safety of 6 herbicides including 33.8% oxadiazon·flufenacet SC through soil sealing treatment. The results showed that 33.8% oxadiazon·flufenacet SC at （20 demonstrated optimal soil-sealing efficacy in wheat fields，achieving 83.29% weed control efficiency 28 days after treatment.Following subsequent foliar application，itmaintained 98.74% weed control rate and 95.09% fresh weight reduction efficacy98 days post-treatment，significantly reducing early-stage weed populations with prolonged residual activity and good crop safety. 50% pretilachlor SC at achieved weed control 82.71% at 28 days，but shorter persistence，with fresh weight control declining to 72.52% at98days after foliar treatment. 30% pyroxasulfone·flufenacet SC at achieved 78.33% weed control at 28 days，exhibiting longer persistence with 93.66% （202 fresh weightcontrol eficacyat98dayspostfoliar treatment.Thesefindings validatethat3herbicidescanbeeffectively aplied as pre-emergencesoil treatments in winter wheat fields，demonstrating significant weed suppression without observablephytotoxicity to wheat growth.Theyexhibit promising potential for extended application in winter wheat cultivation regions such as Shanghai.Rotational use is recommended according to local weed infestation paterns to optimize resistance management and sustained efficacy.

Keywords herbicide；wheat field weeds；control effect； security

小麦是重要的粮食作物之一，其产量因杂草为害造成的损失每年在 20%～30% ，部分重发田块可达 40% 。（剩余4482字）