Study On Chemical Control Technology Of S.trifolia L,Scirpus Juncoides Roxb.,Echinochloa Crusgali(Linn.) In Heilongjiang Paddy Field

Heilongjiang Province was one of the earliest areas in the country to use herbicides.There are many types of herbicides in rice fields.The amount of herbicides is increasing year by year,and malignant and resistant weeds are expanding year by year.How to solve weeds scientifically,efficiently and safely has become the most important problem for farmers.Therefore,in this study,field experiments and pot experiments were used to explore the effects of weed control in rice fields before plugging Soil-treatment and after plugging Soil-treatment,Leaf-treated,,and fly spray Leaf-treated control on common weeds in Heilongjiang rice fields.With a view to providing theoretical support for comprehensive chemical control of weeds in Heilongjiang.The main results were as follows:1.Effects of Soil-treatment herbicides on weedsOxadiazon and Butachlor have the best control effect on Echinochloa crusgali(Linn.)Beauv.,followed by Topstar.pretilachlor and Fluoroglycofen alone did not achieve the purpose of effectively controlling weeds.Fluoroglycofen,oxadiazon,and Topstar have a protective effect on S.trifolia L.between 54%and 59%.Although it has a significant inhibitory effect on S.trifolia L.,it has not exceeded 60%when applied alone.It is lower than the actual weed control requirements in production,so we should also apply herbicides to control S.trifolia L..Both pretilachlor and butachlor are more than 10%effective against S.trifolia L.and cannot be used to control S.trifolia L..The control effect on Scirpus juncoides Roxb.was in the order of butachlor>Topstar>Fluoroglycofen>oxadiazon>pretilachlor,and the use of oxadiazon or pretilachlor alone could not achieve the effect of controlling Scirpus juncoides Roxb..2.Effects of after plugging Soil-treatment herbicides on weedsThe final control effects of Anilofos,Propyrisulfuron,and Triafamone on Echinochloa crusgali(Linn.)Beauv.are all about 90%or more than 90%,which can achieve the effect of controlling grass.Propyrisulfuron treatment has the best control effect on S.trifolia L.,and it can be used to control S.trifolia L.alone.Mesotrione-pretilachlor and Bisulphonone treatments had obvious inhibitory effects on S.trifolia L.,but the effects of using them alone did not meet the actual weed control needs in production.Mesotrione·pretilachlor and Bisulphonone treatments are more than 90%effective against Scirpus juncoides Roxb.,and can be used alone to achieve the purpose of control.Propyrisulfuron has a significant inhibitory effect on Scirpus juncoides Roxb..3.Effects of leaf treatment herbicides control weedsCyhalofop-butyl and penoxsulam have better control effects on Echinochloa crusgali(Linn.)Beauv.,followed by Propanil,and Florpyrauxifen-benzyl is not ideal for yarrow.The comprehensive control effect of S.trifolia L.was Florpyrauxifen-benzyl and Agritox,followed byAgritox-bentazone,and the effects of penoxsulam and Bentazone were relatively low.The overall effect on Scirpus juncoides Roxb.Was Agritox-bentazone>Bentazone>Agritox>Penoxsulam>Florpyrauxifen-benzyl.4.Control effect of flying spray on weeds and safety of riceThe effective spray of Penoxsulam on Echinochloa crusgali(Linn.)Beauv.37.50 g a.i.·hm-2 was not significantly different from the drone flight defense 37.50 g a.i.·hm-2 and 33.70 g a.i.·hm-2.37.50 g a.i.·hm-2 of Penoxsulam sprayed by hand is better than that of 30.00 g a.i.·hm-2 of Penoxsulam in drones.300.00 g a.i.·hm-2 of artificial spray Cyhalofop-butyl is similar to 300.00 g a.i.·hm-2 of drone flying spray Cyhalofop-butyl,and the drone is spray Cyhalofop-butyl 270.00 g a.i.·hm-2 and flying spray Cyhalofop-butyl 240.00 g a.i.·hm-2 have lower control effects on Echinochloa crusgali(Linn.)Beauv.than the above two treatments.The artificial spray Propanil 3060.00 g a.i.·hm-2 has higher control effects on Echinochloa crusgali(Linn.)Beauv.than the three treatments of drone flying spray.It is not recommended to use drone flying spray spraying method.The artificial spraying of Agritox-bentazone 690.00 g a.i.·hm-2 is similar to that of flying spraying Agritox-bentazone 690.00 g a.i.·hm-2.flying spray Agritox-bentazone 621.00 g a.i.·hm-2 and flying spray Agritox-bentazone 552.00 g a.i.·hm-2 is slightly less effective than S.trifolia L.artificial spray treatment.The artificial spray Agritox-bentazone 690.00g a.i.·hm-2 had higher effect on Scirpus juncoides Roxb.than the drone flying spray treatment,and the difference was significant.Safety to rice:Each treatment of Propanilthree drone flying spray.has a greater impact on rice yield.Other herbicide treatments had no significant effect on rice yield.