When is the best time to apply wheat herbicide?

Wheat field agents are used in two peak periods. One is from mid-November to the end of December. The second is from the end of February to the end of March after the new year. However, the best herbicides for wheat fields are before winter, as the grass is young and easy to eliminate. If applied after the new year, firstly, it will be difficult to get rid of the grass, and secondly, the dosage of the herbicide will be large, and the effect will not be as good as that used a year ago, and it is easy to cause the herbicide to There is residual phytotoxicity, so it is recommended to use pesticides beforehand. Wheat field herbicides can be used at temperatures of 8-10 degrees. Wheat weeds have always had a great impact on the growth of wheat. Weeds in wheat fields are difficult to remove and grow quickly. Therefore, we must choose the right time to spray herbicides. When should we spray wheat herbicides? Let me introduce it to you below.

Wheat herbicide application time: The application period is the beginning of wheat tillering before winter and the early stage of wheat jointing in the second year. The control effect is better when used at these two times, and it is relatively safe for wheat. If it is applied later, the effect will be poor. Among them, the earlier the 2,4-D butyl ester is used, the better. Bensulfuron is used after the wheat turns green and before it rises. Use it to avoid phytotoxicity to the next crop.

When applying herbicides to wheat, you must not only control the time, but also the temperature and humidity during application: the average temperature when using herbicides should be above 6°C, which will achieve very good control effects. For example, bensulfuron-methyl and others are temperature sensitive, and the control effect can only be shown 15-20 days or even 30 days after being administered under low temperature conditions. In addition, herbicides should be applied on sunny days and when the temperature is slightly higher, generally from 10 am to 3 pm. If the land is dry, more water should be used when spraying herbicides to ensure the control effect.

Soil moisture must also be well controlled: seize the opportunity to water the wheat fields and apply pesticides in time to ensure that the effectiveness of herbicides is exerted. The effectiveness of most herbicides requires a certain amount of soil moisture. Soil moisture It is conducive to the effectiveness of herbicides at 40-60. The drought is severe and most wheat fields are in drought. If herbicides are used at this time, they should be applied in time after watering (or after rainfall).

Precautions for spraying herbicides on wheat:

① The spraying time must be controlled before the wheat turns green and reaches jointing, and the daily average temperature is stable above 10 degrees. It must not be continued after wheat jointing. Use chemical herbicides to prevent phytotoxicity.

② Pay attention to weather changes before applying pesticides. It is not advisable to use pesticides when there is a strong cooling within 2 to 4 days before spraying.

③ Strictly control the dosage and cannot increase or decrease it at will. Some new herbicide varieties must not be used blindly.

④ When spraying, spray evenly and thoughtfully so that there is no leakage or repeated spraying.

⑤Choose the correct type of herbicide according to the type of weeds in the field.

After reading the above introduction, do you know the effect of spraying herbicides when? In order to achieve a high yield and bumper harvest of wheat, everyone must do a good job of weeding in wheat fields in time.