Corn field grasses harm "enclose" and "kill" in addition to treatment to relax

With the development of wheat harvesting operations in our province, summer corn has generally promoted the application of axillary stubble sowing techniques, which has resulted in high corn stubble, large weeds, large grass age, high density, and strong drug resistance in the corn field. When the corn was unearthed, it suffered from the common siege of “few generations of weeds of the same age”, often accompanied by self-producing wheat seedlings, which greatly increased the difficulty of weed control in corn fields. In addition, due to the use of closed herbicides such as Ethylene Mixture and Ding A Mixture for post-emergence soil treatment for many years, the effect is reduced, the dosage is increased, and the control cost is high. Harm and damage to crops under the crop. At the same time, due to the poor quality of spraying, the amount of liquid to be sprayed is insufficient, and the habit of cherishing water at the expense of drugs is common, and often the liquid spray is not in place and the ideal weeding effect is not achieved. To this end, scientific selection of herbicide species can not only seal off uneaten weeds, but also eliminate weeds that have already been excavated. This is also an effective technical measure to eliminate weeds that have been extirpated in corn fields and is widely promoted. Technical content. In recent years, with the popularization and application of the postemergence stem and leaf treatment agent mixed with nicosulfuron and atrazine, there are frequently problems with safety or prevention and control. Affected by an abnormal climate this year, wheat harvesting and sowing of corn have been postponed. Older weeds in late wheat fields will become harmful plants that will not be overlooked during the seedling stage of corn. These older weeds are also transmitted as a disease of Laodelphax cornuta and seedlings. For the pests inhabiting pests such as pheasants, for this purpose, it is more important to implement “herbicide” and “kill” chemical weeding techniques before seedlings after sowing. The technology of "sealing grass on the ground" is abbreviated as "sealing," and the technology of "killing weeds directly" is abbreviated as "killing." The so-called "sealing" and "killing" are the practical problems that most weeds have already pose a potential threat to the growth of corn before the emergence of corn. The selection of high-quality herbicides is rationally applied to chemical weeding. Can be directly used paraquat (grams without a trace) this highly efficient herbicide species, which is the contact killing stem and leaf treatment agent, (1) can directly "kill" kill weeds, fast-acting, sunny spray after 2 hours can be effective. (2) Rainwater washout, raining after spraying for half an hour, efficacy is not affected. (3) Hidden phytotoxicity is very small and does not cause phytotoxicity to the sorghum crops. If it is used in harmony with the soil treatment and enclosed herbicides such as Ethylene Mixture and Ding A Mixture, it can realize the double-effect weeding effect of “sealing” and “killing”. However, since paraquat (non-selective) is a non-selective broad-spectrum contact-killing herbicide, it cannot be sprayed on crops. Therefore, the following points should be mastered when using “sealing” or “killing” weed control techniques. : First, at the same time, “sealing” and “killing” before the emergence of corn seedlings, the entire field where weeds have high density of weeds can be used simultaneously to “close” and “kill” weeding techniques. In other words, paraquat (graceless) plus ethiacloprid or diflunomide is used immediately before corn seeding, and both agents are sprayed simultaneously. Second, the first "sealed" after the "kill" corn after sowing after the emergence of less field grass, can be "closed" after the "kill" weeding technology. If there are few weeds in the field and a large number of weeds have not yet been excavated, spray EtOH or Ding A Mixture before emergence after sowing, until the 7-8 leaf stage of the corn, spraying sprayer and protective cover to spray between rows. Paraquat (without trace). Before wheat was harvested, corn was interplanted. After the wheat was harvested, it was sprayed with some stems and leaves to treat herbicides at the 3rd leaf stage. When the corn grows to 7-8 leaves, paraquat is sprayed between the rows of corn. (g without a trace). Third, the first "kill" after the "sealing" after sowing after corn planting, field weeds are mostly distributed between the rows, can be "killed" after the "closed" weeding technology. If the grass before the emergence of corn is basically distributed in the rows between the rows of maize, seedlings can be sprayed paraquat (g without trace) before the emergence of corn; if there is still a large number of weeds after maize emergence requires control, Before the 3rd leaf stage of the weeds, the broadleaf weeds must be sprayed immediately before the 4th leaf stage and sprayed with “mesotrione glutamate (Geng Jie)” postemergence stem and leaf treatment agent 100 ml/mu plus 0.5%. Additives, spring corn field 120 ml / acre with 0.5% additives. The post-emergence stem and leaf treatment of the herbicide is safe for corn and has strict requirements for the moisture content, and has a fast-acting effect. The weeds are dead 7 to 14 days after the medicine. It is important to emphasize that the pesticide spray is even and thorough, and no heavy spray is needed. The liquid dosage per mu is 30 kg; sweet corn, waxy corn, popcorn, and ornamental corn should not be used, and should not be mixed with organophosphorus pesticides and carbamate pesticides. Use with. IV. Post-emergence selective weeding. Intercropping wheat before harvesting. If wheat has emerged after harvesting, select the herbicide type that will be used after maize seedlings. Use mesotrione as much as possible according to the growth of the grass. Astragalus (Geng Jie) and other safety traits good stem and leaf treatment agent. Precautions: The use of "sealing" and "killing" weeding techniques requires attention to five points: First, sandy or heavy-soiled maize fields often have poor weed control effects. It is necessary to appropriately increase the amount of spraying liquid medicine. The second is to try to maintain a good soil moisture content, generally encounter drought, high temperature environment, often do not achieve the desired effect. If such an environment is encountered, special emphasis should be placed on the technical aspects of “sufficient spraying of liquid medicine and uniform spraying”. Do not “cherish the water without hesitation”. Thirdly, the amount of liquid sprayed per mu of corn field should not be less than 45 kg. It is necessary to emphasize that one spray is even and no spray is used. In particular, under conditions of high wheat straw and dry climate, the amount of liquid sprayed can not be reduced. . The fourth is to operate in strict accordance with the "Pesticide Safety Standards." The fifth is to strictly grasp the "enclose" and "kill" chemical weeding techniques. 1After wheat is harvested, the corn planted after stubble sowing should be mixed with 100 grams of paraquat (less than 100 mg) and 200 grams of Gabriella Mixture (or other closed herbicide) 150-150 ml per acre after sowing. 200 ml. (2) Wheat interplanted with wheat should be sprayed immediately after wheat is harvested with Ding A Mixture (200 g/mu) or Ethylene Mixture (or other closed herbicide) at 150-200 ml/mu. After the 7th leaf of maize, paraquat (without trace) 150ml/mu was sprayed in a directed manner, and a protective cover was added during spraying.

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