Herbicide is an important means to effectively control weeds, but the use of herbicides is not a simple spray to obtain good control or control effects, which is also affected by many other factors. Compared with insecticides and fungicides, the use of herbicides is more complicated, and its effectiveness is often influenced by many factors, as follows:
1. Temperature and humidity issues.
When the herbicide is applied at high temperature and humidity, the weeds are easily absorbed, and the weeding effect is remarkable. It is not the higher the temperature, the better. When the temperature reaches the limit, the sprayed liquid is quickly evaporated, especially Those herbicides that are volatile and easy to decompose are counterproductive; the humidity is too high (such as dew or rain in the morning), because there is a layer of water droplets on the blades of grass, which can also affect the efficacy after spraying with the water droplets. . Generally, it is best to use herbicides in the windless days, after about 10 hours in the morning, or in the evening.
2. Soil water content problems.
The soil has high humidity and high water content, which is beneficial to the growth of crops and weeds. At this time, the herbicide can enhance the absorption capacity of weeds, accelerate the conduction and transportation in the body, and make the herbicides play a role in killing weeds; Drought, less rain, slow growth of crops and weeds, and crops are weaker, so resistance is poor, and weeds will make stems and leaves form better cuticles and fruit micelles, stems and leaves become dry, The liquid medicine is difficult to be absorbed and transmitted by the weeds. Therefore, the herbicide should be appropriately increased in the dry weather, and the amount of water spray should be increased accordingly.
3. Use the issue of the period.
Generally, herbicides can be applied before and after sowing and in the late stage of seedlings. However, different herbicides have the best application period of application, and the seedlings (buds) are applied before or after sowing. The application should be used in the post-emergence; if the post-emergence weeding requirements are to master the weeds 2~3 leaf stage, if the spraying has exceeded the age, the weed resistance is strong and the effect is poor. Therefore, we must correctly master the appropriate application.
4. Spray quality problems.
When the spray is not evenly mixed, if the upper and lower layers of the whole barrel are inconsistent, there will be some weeding effect after spraying, and some will have no effect. There will also be insufficient water spray and too low or too high a dose, which will affect the herbicidal effect and even cause phytotoxicity.
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