Main points of chemical weeding before wheat in winter
The chemical weeding of wheat before winter has many advantages such as less medication and good effect, and should be promoted vigorously. Specifically, you must master the following points.
It is forbidden to use drugs before the wheat trifoliate. Before the three-leaf stage of wheat, the resistance of wheat seedlings was very poor. In this period, the use of drugs was very easy to cause wheat phytotoxicity, and the light leaves were distorted to affect the yield.
After the weeds are all unearthed, they are used again. The herbicide in the wheat field is a stem and leaf treatment agent, and only when the liquid is sprayed on the weeds has a control effect, and the use of the weeds that are unearthed is not effective.
Master the time of medication. 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 is suitable. Therefore, after the wheat trifoliate and weeds are all unearthed, apply as early as possible. North China is generally available in the middle and late November.
Choose a herbicide variety. For the broad-leaved weeds such as Artemisia selengensis, Chinese chive, M. sylvestris, Poria sinensis, and sorghum, the use of bensulfuron-type herbicides; for weeds such as wild oats, brome, and wheat For the main selection of herbicides such as Shima; for the mixed occurrence of broadleaf weeds and grass weeds, it is advisable to use a mixture of bensulfuron and Shima.
Appropriately reduce the amount of application. Weeds in wheat field before winter, the seedlings are poorly resistant and easy to control, and the dosage can be appropriately reduced compared with spring. The recommended minimum amount of herbicide is recommended.
Application method. Before spraying, the herbicide should be firstly mixed into mother liquor and then added with water. In order to make the spray even, add water should be appropriate. The amount of liquid per 667 square meters should not be less than 30 kg. When spraying, the spraying speed should be The height of the nozzle and the width of the spray are basically the same, so that it does not leak or spray.
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