The use of herbicides should not ignore the weather

The use of chemical herbicides is closely related to meteorological factors. Scientific use under appropriate weather conditions can greatly increase the efficacy of herbicides.

1. The "negative" influence of wind and rain and the countermeasures

The test results showed that when the herbicides were sprayed at wind speeds exceeding 8 to 10 m/s, the herbicide efficacy was reduced by about 5%. At the same time, the mist of herbicide sprayed under the action of wind can also be moved to other nearby sensitive crops with the wind to cause phytotoxicity. Therefore, the use of herbicides should be stopped in windy weather conditions; timely rainfall and appropriate rainfall (preferably 10 to 15 mm) are beneficial to herbicides for soil treatment. The reason is that rain can accelerate the spread and movement of herbicides, and at the same time enable weeds to fully absorb herbicides in the process of rapid germination and growth, which will improve the weeding effect. If herbicides are applied before the seedlings are sowed in dry regions, weeding Poor performance. If rainfall is encountered after the herbicide is applied to the stems and leaves, the sprayed chemicals are washed away by the rain, and the efficacy of the herbicide is also greatly reduced. Therefore, if the herbicide is exposed to rain within 6 hours after spraying, spray should be added again.

2. The "negative" influence of temperature and humidity and countermeasures

The use of herbicides is proportional to the temperature. When the temperature is high, weeds have a strong ability to absorb and transport herbicides, and the herbicides have high activity, so that weeds can be fully exerted on the weeds. The test results showed that the higher the temperature of air and soil when applying herbicide, the more significant its efficacy, especially the herbicide efficacy of stem and leaf treatment herbicide can be greatly improved, and the use of herbicide under low temperature weather conditions. The effect will not only be significantly reduced, but also the detoxification effect of crops in vivo will be slow due to low temperature, so it is easy to induce phytotoxicity. The herbicide application temperature is appropriate to 20 ~ 35 °C, air humidity also has significant effect on the use of herbicides The application of stem and leaf herbicides under relatively high air humidity can extend the residence time of herbicides on the weed leaf surface, and help the opening of weed leaf surfaces, thereby absorbing a large amount of herbicides, thereby improving the weeding effect. The purpose of the treatment of herbicides in soil treatment is to transport them upward along with a large amount of water, which helps to inhibit photosynthesis and can significantly improve weed control efficacy. Therefore, when herbicides are used, the greater the humidity of the air, the more significant the herbicidal effect; otherwise, the herbicidal effect will be reduced.

3. The "negative" influence of sunshine and drought and countermeasures

The intensity of sunshine is also closely related to the use of herbicides. The use of herbicides under strong sunshine conditions is beneficial to the weeds' absorption and transmission of herbicides, and the strong temperature of the herbicides, due to the higher temperature, most herbicides are active. It will also be enhanced, which can increase the efficacy of herbicides, especially the treatment of herbicides stems and leaves the most obvious response to sunlight. It is necessary to draw attention that the sensitivity of various herbicides to sunlight response is strong or weak, for example, ether can fully exert its efficacy after being exposed to light, and trifluralin is prone to photolysis and failure after being exposed to light. Therefore, farmers' friends must strictly follow the instruction manual when using. Under dry weather conditions, low humidity and low soil moisture are not conducive to the absorption of herbicides by weed roots, which will significantly reduce the use of herbicides.

In addition, if weeds are sprayed on the weeds, the drought not only prevents the spread of liquids on the foliage, but also inhibits the opening and respiration of stomata and lenticels on the weed leaf surface. Physiological activities also occur. It will be limited, weeds will grow slowly, their ability to absorb herbicides will be greatly reduced, and they will also inhibit and affect the efficacy of herbicides.

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