When is the wheat herbicide ready and when can't it be used?

Wheat is a densely planted crop, so it is difficult to weed mechanically.

Chemical weeding is very popular with farmers because of its high efficiency, low cost and reduced labor intensity.

However, improper use of herbicides can also lead to problems such as poor weeding effect, phytotoxicity and residual pollution of crops in the current and subsequent crops.

so, when will the wheat herbicide be ready? When can't the wheat herbicide be used? Let's take a look at it.

Correct application time of wheat herbicide 1. Before winter, the application time of chemical weeding is about 45 days after wheat sowing, after the 3-leaf stage of wheat, when weeds are basically in full bloom and the tissues are tender, the control effect is generally good from mid-late November to early December.

2. After the Spring Festival, the herbicide must be sprayed completely before the wheat jointing stage. After jointing stage, the herbicide cannot be used. Some drugs will cause phytotoxicity to the wheat, resulting in symptoms such as deformation, bending and empty trees, which will affect the wheat yield. Therefore, it is necessary to use the drug in time for the guidance of agricultural technicians.

After the Spring Festival, broad grass and gramineous grass all came out together, but the grass was older and had more wheat leaves. Compared with the pesticide application years ago, the dosage and water were appropriately increased to kill the weeds.

3. Timely spraying: choose sunny weather with no wind or rain and an average temperature of about 8 degrees; Apply pesticide when soil and wheat seedlings have good moisture content; When the soil moisture is not good and there is no rain, it can be applied 3~5 days after watering; Apply the pesticide at intervals of about 1-2 days after heavy rain, and apply it at any time after light rain, so as to ensure that no rain occurs 8-12 hours after application.

If the temperature is lower than 8 degrees and the soil is dry, it will affect the effect of herbicide.

when can't wheat herbicide be used? 1. You can't fight when the soil moisture is not good or when the wheat moisture is not good.

2. Do not fight before and after heavy rain, strong wind or cold air.

3. Wheat can't be beaten before 4 leaves and after jointing.

4. You can't fight organic and carbamate pesticides for seven days before and after.

5, the average temperature is lower than 8-1 degrees can't play.

Precautions for spraying herbicides on wheat: ① The spraying time must be controlled before the wheat turns green to jointing stage, and the daily average temperature should be kept above 1 degrees. Chemical herbicides should not be used after jointing stage to prevent phytotoxicity.

② Pay attention to the weather changes before application. If there is a strong temperature drop within 2-4 days before application, it is not appropriate to use drugs.

③ The dosage should be strictly controlled, and it should not be increased or decreased at will. For some new herbicide varieties, it must not be used blindly.

④ spray evenly and thoughtfully, so as not to miss or repeat spraying.

⑤ Choose the right herbicide type according to the weed species in the field.