Pre-winter chemical weeding has many advantages such as less use of drugs and good effects, and should be vigorously promoted. Specifically, we must grasp the following points.
Wheat is forbidden to be used before the three-leaf stage. Before the wheat trifoliate stage, the resistance of wheat seedlings was very poor. During this period, the use of pesticides could easily cause wheat injury. The distortion of the light leaves affected the yield. In severe wheat, the heading could not be normal.
All the weeds were unearthed before medication. Wheat field herbicide is a stem and leaf treatment agent. Only spraying liquid on weeds will have control effect, and use of weeds that are not unearthed will be ineffective.
Have a good grasp of medication time. Herbicide efficacy is greatly affected by light, temperature and soil moisture. The light is sufficient, the temperature is high, and the effect of the medicine is good when the soil moisture is suitable. Therefore, as early as possible in the wheat three-leaf stage and all weeds are unearthed. North China can generally be held in the middle or late November.
Select herbicide varieties. For herbicides with tribenuron-based weeds such as wheat straw, leeks, rice vases, pigweed, and broad-leaved weeds, and grassy weeds such as wild oats, bromegrass, and fronds The herbicides that can be used mainly include Shima; for the combination of broad-leaved weeds and grass weeds, it is appropriate to use tribenuron-Somalon in combination with Shima.
Appropriately reduce the amount of application. Before the winter wheat field weeds, seedlings have poor drug resistance and are easy to control. The application amount can be reduced as compared with the spring season. The recommended minimum dosage for herbicides is appropriate.
Application method. Before herbicide spraying, the herbicide should be used as mother liquor and then added with water. In order to make the spraying uniform, the amount of water should be appropriate, and the amount of liquid used per 667 square meters shall not be less than 30 kg. When spraying, the spraying speed should be The nozzle height and spray width are basically the same, so that it does not leak or spray.
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