How to avoid herbicide damage when weeding wheat in winter? A detailed guide to the latest methods
After entering winter, the temperature drops more noticeably, and at this time crops are basically in a dormant and growth-stopped period. This winter, however, the temperature is still relatively high, and recently it has risen again. Many farmers are also carrying out field management of wheat, especially weeding. But when weeding, you must also pay attention to herbicide damage, so how should wheat weeding avoid herbicide damage? Let's find out together.
1. How should wheat be weeded to avoid herbicide damage?
1. Make sure there is no frost after application
Although the weather has been sunny recently and the temperature is fairly suitable, the temperature difference between day and night is still relatively large, so when using herbicides, you must always pay attention to weather changes and there must be no frost. This is because after wheat is sprayed with herbicide, both the weeds and the wheat will be harmed, but the wheat can remain safe only because a safener is added to the herbicide. If frost or a sharp drop in temperature occurs after spraying, the safener cannot play its proper role and cannot detoxify, causing herbicide damage.
2. Keep the temperature above 5-8 degrees during application
Wheat herbicides are relatively sensitive to temperature. If the temperature is too low, it will not only affect the weeding effect but also cause herbicide damage. For wheat herbicides, generally the higher the temperature, the more favorable it is for weeds to absorb them, but winter temperatures are generally not very good, so it is more suitable to spray when the daily average temperature is 5-8 degrees.
3. Pay attention to the spraying time
When using herbicides for weeding, it is best to choose after 9 a.m. and before 3 p.m., because the temperature is higher during this period and the dew has basically evaporated completely. Applying the herbicide at this time helps the solution adhere to the weeds. Also, because there is sufficient light, the stomata of the weeds open, making it very easy for them to absorb water and the herbicide solution, so the weeding effect is obvious.
4. Weak seedlings are not suitable for herbicide use
When spraying, you should also take the actual situation into account, that is, wheat sown late or small seedlings are not suitable for herbicide use, otherwise the herbicide damage will be worsened. In addition, chemical weeding should not be carried out on weak or yellow seedlings caused by incomplete straw return to the field.
2. Remedies for herbicide damage
After herbicide damage occurs in wheat, promptly spray brassinolide + monopotassium phosphate, amino acid foliar fertilizer + monopotassium phosphate, or biostimulant + monopotassium phosphate to repair damaged tissues. After that, you can choose to water or, when it rains, broadcast chelated zinc fertilizer plus urea to promote the rapid recovery of the root system, ensure safe overwintering, and ensure rapid growth after the beginning of spring.
The above is an introduction to how to avoid herbicide damage when weeding wheat in winter. We hope it can help you. To learn more related knowledge, please keep following us.