Can you weed in the cloudy wheat field? Will it have any effect?

When applied in rainy days, as long as there is no water on wheat leaves and it doesn't rain for six or seven hours after application, the liquid sprayed in weeds will be digested and absorbed by weeds. At present, most herbicides are microbial herbicides, and herbicide liquid is digested and absorbed by weeds. It has gradually split, eroded and destroyed the cell tissue in weeds, and finally killed weeds. Different liquid medicines will kill weeds in different forms. Generally, wheat is planted after the first first frost Festival and obtained in the awning period. Herbicide in wheat field is the most suitable application time from planting to wheat heading period.

At this time, it happens to be winter and early spring, with low temperature and extremely low weed activity. Therefore, it is very necessary to choose a suitable time to spray herbicides. Otherwise, even if more investment is made in herbicide projects, not only the weeding effect is not ideal, but also the land quality in wheat fields will be polluted and destroyed. Weeding before seedling is to seal the soil layer after sowing and before germination. Acetamiprid preparations are the main pharmaceutical dosage forms, because they can increase the adhesion and water permeability of the liquid medicine, and the sealing effect is stronger after application.

The closed application of pesticide before seedling also has certain regulations on soil water content. The surface drying of soil layer will affect the infiltration of chemical liquid, easily cause some chemical liquid to evaporate, and the sealing effect is poor, which not only increases the field workload, but also increases the product cost. Therefore, in the case of low soil water content, it is necessary to increase the amount of water, or to apply pesticides in the field in the morning and evening. It is best to use mechanical equipment sprayers to apply pesticides, which requires sufficient water. In ord to achieve better effect,

And to ensure the safety of wheat, it must be carried out on sunny days with an average daily temperature above 8 degrees, and the duration of pesticide application should be controlled when the ambient temperature is relatively high at noon. Due to the changeable weather in spring, in order to avoid the influence of temperature drop on the efficacy and wheat safety, it is necessary to grasp the cold tail and warm head spraying according to the growth period and weed germination, which is not suitable for rainy days. This will not only endanger the weeding effect because of insufficient ambient temperature and light conditions, but also if it snows or the precipitation exceeds the standard.