The best time for winter weed control in wheat fields and how to control wild oats

AbstractThe best time for weed control in winter wheat fields is from mid-November to early December, that is, when wheat seedlings have grown to 4 leaves. Generally, 30-45 days after wheat sowing is the best time to control wild oats, that is, the control effect from November 1 to 20 is relatively good, because by then most weeds have already emerged, and the weeds are still young, making them easy to control.

1. The best time for winter weed control in wheat fields

1. You can choose mid-November to early December, when wheat seedlings have grown to 4 leaves. This is the best time for weed control in wheat fields. At this time, most weeds have just emerged and have relatively poor resistance to herbicides, so the control effect is relatively good. One application can basically control weeds throughout the whole growth period. At the same time, because the application time is early and herbicide residues are low, the impact on subsequent crops is also relatively small.

2. However, when herbicides are used at low winter temperatures, their efficacy is noticeably longer than when used at high temperatures. Generally, it takes 12-15 days for the weeds to wither, whereas when controlling green foxtail in farmland at high summer temperatures, generally all weeds in the field will wither and die within 5-7 days. Therefore, after application, wait patiently. As long as the timing is right and the spray is applied thoroughly, reapplication is usually unnecessary.

3. When controlling weeds, strictly control the dosage, and do not arbitrarily reduce the amount of water used. When spraying, apply evenly, do not spray the same area twice, and do not miss any area. Herbicide must be sprayed on all weeds, otherwise the effort will be wasted and ineffective.

4. If the herbicide dosage is relatively large, it will cause crop injury, easily cause pollution, and may even have adverse effects on subsequent crops. If the dosage is relatively small, the weed control effect will be poor, and it will not achieve the purpose of controlling weeds and protecting wheat for a long time. Therefore, when using herbicides, the dosage must be strictly controlled. Usually, the application rate is 30-40kg per mu.

5. When using herbicides, operations must be carried out strictly in accordance with the technical procedures, because winter temperatures are relatively low and are often accompanied by strong winds, which is not conducive to the exertion of herbicide efficacy. It is necessary to seize sunny days when the temperature is relatively high to apply the herbicide. At this time, the physiological metabolism of weeds is relatively active, which is conducive to the conduction of the herbicide within the weeds, and the weed control effect is also relatively good.

2. The best time to control wild oats in wheat

1. Generally, 30-45 days after wheat sowing is the best time to control wild oats, that is, the control effect from November 1 to 20 is relatively good, because most weeds have already emerged, and the weeds are still young, making them easy to control.

2. In recent years, the occurrence of wild oats has become more and more serious. What everyone often calls wild oats is actually divided into bromegrass, wild oat, and jointed goatgrass. Because it is often unclear which kind of wild oat it is, improper herbicide use occurs, leading to more and more wild oats and seriously affecting wheat yield.

3. According to surveys, the wild oat varieties in places such as Shandong and Hebei are mainly bromegrass, followed by wild oat and hard grass. Although control is carried out every year, not only have they not been eradicated, but there is also a trend of worsening spread.