1. Pre-emergence herbicide weed control mechanism: Most pre-emergence herbicides are absorbed by the weed seedlings (generally monocotyledon weeds are absorbed by the coleoptile and dicotyledon weeds are absorbed by the hypocotyls) and are rarely absorbed by roots. . To achieve the weeding effect, the collected medicine must reach 0-5 cm in the “weed germination circleâ€.
2. Problems in spring application of pre-emergence herbicides in North China:
Northern China's spring application period (late April to mid-May) often encounters strong winds, drought, and rain. After the herbicide is applied, it is easily scratched by the wind or stays on the ground. It cannot contact the weeds and it is difficult to exert herbicidal effects. If there is no rainfall or irrigation after spraying, mechanical measures should be taken to ensure efficacy.
3, using the seedling herbicide technical points:
(1) The quality of site preparation is better: The ground is required to be ground and broken, and there is no plant residue on the surface to ensure uniform distribution of pesticides.
(2) Choose the officially registered pesticide species
(3) The use of standardized spraying machinery and accurate spray technology: Spraying pre-emergence herbicides requires the spraying of droplets of 300 to 400 microns in diameter and 30 to 40 droplets per square centimeter.
Misunderstanding: The effect of applying pesticide after rain is good.
The farmers in the north of the country waited for more rain and medicine in spring. They only paid attention to the pre-emergence herbicide requirements for public opinion, but brought a series of problems:
(1) In the period of missed shoots absorption, the medicine is not in contact with the young shoots.
(2) Disadvantages of applying pesticides after rain: Soil moisture goes upward after rain, and it is difficult for herbicides to reach the 0-5 cm tillage layer to be absorbed by weeds. Sunny spring weather often occurs after rain, and herbicides can be lost as water evaporates. . Applying before or before irrigation is better than applying after spraying. The application of pesticides after raining should also be done in a timely manner by lightly mixing the soil or cultivating 2 cm in time to prevent loss of herbicides due to evaporation and wind blowing.
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