The Study On The Control Effects Of Different Herbicide To The Weeds In Direct Seeding Rice Fields

Direct Seeding of rice is a non-seeded rice seedlings,no planting,no transplanting,sowing seeds directly simply to light Cultivation of daejeon,with increased labor productivity,land productivity,cost savings,increase efficiency characteristics,so popular with farmers.However,due to the long-term direct seeding rice field in minimum tillage,no-tillage state,pre-sowing paddy to wet-based,direct seeding rice growth period and the growth of weeds growing synchronization and other reasons,is very conducive to the growth of weeds,grass seeded rice fields injury problems have become the main obstacle seeding rice quality and high yield,increase production and large scale applications.Plots of this paper was in Hefei,Anhui Changfeng County Gang Sha Xucun town conducted field efficacy trials,30%were studied cyhalofop dispersible oil emulsion on direct seeding rice fields suspending barnyard grass,semen euphorbiae lathyridis and other weeds controlling effect,the optimal dose and safety of live rice,24%-5 pyrazole-cyanide fluoro grass can be oil suspension agent annual weeds in direct seeding rice barnyard grass,semen euphorbiae lathyridis control effect and optimum dosage and dispersion of direct seeding rice safety,10%pyribenzoxim EC on direct seeding paddy barnyard annual weed control effect,the best dosage and of direct seeding rice safety.20%pyridine ethyl Chlorsulfuron can dispersing oil suspension agent on direct seeding rice field of barnyard grass,sedge and broadleaf weeds control effect and optimm dosage and of direct seeding rice safety and control effect of 15%Cyhalofop EC on gramineous weeds in direct seeding rice field weed,semen euphorbiae lathyridis,the best the dose and of direct seeding rice safety,as a new efficient,safe,effective and low cost live weeds in rice field,providing theoretical basis.The following conclusions are drawn in the experiment:1.30%cyhalofop dispersible oil suspoemulsion best control effect on direct seeding rice fields echinochloa crusgalli,semen euphorbiae lathyridis and other gramineous weeds should be in rice seedling weed 2～3 leaf stage and 1 application using amount of preparation for 20 ml/667m~2～40 ml/667m~2,active ingredient dosage of 90g/hm~2～180 g/hm~2.2.24%-5 pyrazole_cyanide fluoro grass can be dispersed oil suspending agent annual weeds in direct seeding echinochloa crusgalli,semen euphorbiae lathyridis of the best control effect in weed 2～3 leaf stage and 1 application using amount of preparation for 50 ml/667m~2～80 ml/667m~2,active ingredient dosage for 180 g/hm~2～288 g/hm~2.3.10%pyribenzoxim EC on direct seeding rice fields echinochloa crusgalli annual weed of the best control effect should be in weed 2～3 leaf stage and 1 application using amount of preparation for 25 ml/667m~2～50 ml/667m~2,active ingredient dosage is 37.5 g/hm~2～75 g/hm~2.4.20%pyrazosulfuron dispersible oil suspension of direct seeding rice fields echinochloa crusgalli sedge and broadleaf weeds of the best control effect in weed 2～3 leaf stage,1 application,using preparations for 10 ml/667m~2～20 ml/667m~2,namely active ingredient dosage is 30 g/hm~2～60 g/hm~2.5.15%Cyhalofop butyl EC to live in paddy field echinochloa crusgalli,semen euphorbiae lathyridis and so on gramineous weeds of the best control effect in rice seedling stage and weeds 2 or 3 leaf stage and 1 application using amount of preparation for 50 ml/667m~2～100 ml/667m~2,active ingredient dosage of 112.5 g/hm~2～225g/hm~2.Herbicide Application Method are configured using the double dilution method,uniform Stem and Leaf Spray,do not re-spray and leak spray,Before spraying discharged water within the paddy,irrigation 24 hours later,retain water for 5-7 days and maintain water depth of 3cm-5 cm.