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1. “Negative†influences and countermeasures of wind and rain weather The test results show that the herbicide can be sprayed at a wind speed of more than 8-10 m/s, and the efficacy of the herbicide can be reduced by about 5%. At the same time, the action of the net wind spray sprayed herbicide droplets can also drift with the wind to other sensitive crops nearby to cause phytotoxicity. Therefore, herbicides should be stopped in windy weather conditions; timely rainfall and appropriate rainfall (10 to 15 mm is preferred), which is beneficial to soil treatment of herbicides. The reason is that the rain can accelerate the spread and movement of the herbicide, and at the same time, the weed can fully absorb the herbicide in the process of rapid germination and growth, which is beneficial to improve the herbicidal effect. If the herbicide is applied before the seeding in the arid area, the weeding The performance is poor. If the rain is encountered after the application of the herbicide to the stem and leaf treatment, the sprayed agent is washed away by the rain, which will greatly reduce the efficacy of the herbicide. Therefore, if the herbicide is exposed to rain within 6 hours after spraying, the spray should be re-added.
2. "Negative" influence of temperature and humidity and countermeasures
The use of herbicides is proportional to the temperature. When the temperature is high, the weeds have a strong function of absorbing and transporting the herbicide, and the herbicide has high activity, and it is easy to exert the herbicidal action at the action site of the weeds. The test results show that the higher the temperature of air and soil is, the more effective the herbicide is, especially the herbicidal effect of stem and leaf treatment herbicide can be greatly improved, and the use of herbicide under low temperature conditions. The effect will not only be significantly reduced, but the detoxification effect of the crops in the crops will be slow due to low temperature, which will easily induce phytotoxicity. The temperature of applying the herbicide is preferably 20-35 ° C, and the effect of air humidity on the herbicides is also effective. The effect is obvious. Applying the stem and leaf herbicide in the case of relatively high air humidity can prolong the residence time of the herbicide on the weed leaf surface, help the open surface of the weed leaf, and absorb a large amount of herbicide to improve For the purpose of weeding effect, after the soil treatment herbicide is absorbed, it will be transported upward with a large amount of water, which is beneficial to inhibit photosynthesis and can significantly improve the herbicidal effect. Therefore, when the herbicide is used, the greater the humidity of the air, the more obvious the herbicidal effect; on the contrary, the herbicidal effect is lowered.
3. "Negative" influence and countermeasures of sunshine and drought
The strength of sunshine is also closely related to the use of herbicides. The use of herbicides under strong sunlight conditions is beneficial to the absorption and transmission of weeds by weeds. The strong temperature is the highest herbicide activity. It will also increase, which will improve the efficacy of herbicides, especially the stem and leaf treatment herbicides have the most obvious response to sunlight. It should be noted that the sensitivity of various herbicides to sunlight reaction is strong and weak. For example, ether can fully exert its effects after seeing light, and it is prone to photolysis and failure after exposure to light. Therefore, farmers must use strict instructions in accordance with the instructions for use. In dry weather conditions, due to low atmospheric humidity and low soil moisture, it is not conducive to the absorption of herbicides by weed roots, which will significantly reduce the use of herbicides. In addition, the herbicide is sprayed on the leaf surface of the weed, the drought will not only prevent the diffusion of the liquid in the leaf surface, but also inhibit the opening and respiration of the pores and lenticels on the weed surface. Activities are also limited, weeds grow slowly, their ability to absorb herbicides will be greatly reduced, which will also inhibit and affect the efficacy of herbicides.
The use of chemical herbicides is closely related to meteorological factors, and scientific use under appropriate weather conditions can greatly improve the efficacy of herbicides.
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