Chemical weeding in wheat field is good before winter
Weeds in wheat fields are widely distributed and have many types. It is one of the important factors affecting the high yield of wheat by competing with wheat, competing for water, glory, and spreading pests and diseases. For chemical weeding in wheat fields, pre-winter control is much better than spring control and has high safety.
First, the advantages of chemical weeding in wheat fields before winter
1. Save pesticides. The wheat seedlings are smaller before winter, and the herbicide can be sprayed on the weeds to the maximum extent, thus reducing the amount of liquid medicine.
2. Easy to remove weeds. Most of the weeds in the wheat field before winter are just unearthed, usually before the 3-leaf stage, the resistance is low, and it is easy to be removed.
3. Pesticide residues are small. Weeding before winter, due to the relatively long planting time of the lower crop, the herbicide can be fully decomposed in the soil, thereby reducing the residual amount of the herbicide in the soil and not affecting the growth of the lower crop.
Second, the main points of weeding techniques in wheat fields before winter
1. It is forbidden to use medicine before the 3 leaf stage of wheat. Before the wheat 3 leaf stage, the resistance of wheat seedlings was very poor. In this period, the drug was easily caused by wheat phytotoxicity, and the light leaves were distorted to affect the yield. In the later stage, the wheat could not be harvested normally.
2. All the weeds are used after they are unearthed. The herbicide in the wheat field is a stem and leaf treatment agent. Only when the liquid is sprayed on the weeds can the control effect be used. The use of prematurely has no effect on the unearthed weeds.
3. 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 soil moisture is suitable for drug use. Therefore, after the wheat 3 leaf stage and the weeds are all unearthed, apply as early as possible. North China is generally available from mid-late November to early December.
4. 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 Mainly used herbicides such as World Code; for the mixing of broadleaf weeds and grass weeds, it is advisable to use a mixture of bensulfuron and the code.
5. Appropriately reduce the amount of application. Weeds in wheat field before winter, the seedlings are poorly resistant and easy to control. The dosage can be appropriately reduced compared with spring, and the recommended minimum amount can be used as the herbicide used.
6. Method of application. Before spraying, the herbicide should be firstly converted into mother liquor and then added with water. In order to make the spray uniform, the amount of water should be appropriate. The amount of liquid per acre should not be less than 30 kg. When spraying, the spraying speed and nozzle height should be used. The spray width is basically the same, so that it does not leak or spray.
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