What temperature is suitable for wheat herbicide?

Under normal circumstances, weeds in wheat fields after the Chinese New Year are mainly sown with Artemisia annua, shepherd's purse, Veronica, wild oats, oats, lacquer and so on. When to apply herbicides properly depends on several points: first, it is in the green period; Second, the temperature should be appropriate; Third, we should pay attention to cold protection in spring, and temperature is the most important. Let me tell you in detail.

Temperature plays a very important role in herbicides. If the temperature is too low, not only the drug effect can not be achieved, but also phytotoxicity is easy to occur. Just after the New Year, the temperature may still be below zero at night, so we should find a suitable weather to fight herbicides.

Because when the temperature is right, wheat and weeds begin to recover. In this period, weeds are not very resistant. At noon on a sunny day, when the temperature is higher than 10 degrees, you can use medicine (if you look at the average temperature, make sure it is above 6 degrees). At the same time, we should also remind ourselves that when using herbicides, we should look at the weather conditions in the next few days after the weather forecast to ensure that there is no sudden cooling and rainfall.

Among them, it is necessary to prevent sudden cooling, especially to pay attention to "cold spring". This year, wheat in some areas of Henan Province was affected by the "late spring cold", resulting in reduced production.

In addition to temperature, there are some precautions that everyone should pay special attention to. There are three main points:

1. Pay attention to the application time of herbicide. Wheat is different from corn and soybean. The application time of wheat should be from 10 am to 15 pm. When the temperature is high (or because of the temperature), weeds will absorb more herbicide liquid, and the effect will be better.

2. Spraying methods should also be controlled. For example, the same herbicide can be sprayed all over the field the year before, but it may not be sprayed all over the field the next spring. In order to avoid the harm of herbicides to wheat, directional spraying is needed (some herbicides may add safeners or be sprayed all over the field, but for safety reasons, directional spraying is recommended).

3. Pay attention to the change of herbicide dosage, because weeds will increase and the resistance will increase in spring after the year. In order to achieve the weeding effect, the dosage of herbicides can be appropriately increased, such as a set of herbicides with both broad-leaved and broad-leaved crops (one bag+one bag). A set of medicine can hit an acre of land (667 standard acres) years ago, and it will hit 7 in the spring after the year.