The use of herbicides is closely related to meteorological factors, and scientific use under appropriate weather conditions can greatly improve the efficacy of herbicides.
1. The "negative" influence of wind and rain and its countermeasures
The test results show that the herbicide can be reduced by about 5% when the herbicide is sprayed under a wind speed of more than 8-10 m/sec. At the same time, the herbicide mist sprayed under the action of the wind can also drift to the other sensitive crops nearby to cause phytotoxicity. Therefore, the herbicide should be stopped under high wind conditions. Timely rainfall and appropriate rainfall (10-15 mm is preferred), which is beneficial to soil treatment of herbicides. The reason is that the rain can accelerate the diffusion 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. The "negative" influence of temperature and humidity and the 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 effect at the action site of the weed. 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 also the detoxification effect of the crop body will be slow due to low temperature, which is easy to induce phytotoxicity. The temperature of applying the herbicide is preferably 20 ° C to 30 ° C. Air humidity also has an obvious effect on the efficacy of herbicides. Applying stem and leaf herbicides in the case of relatively high air humidity can prolong the residence time of herbicides on weed leaf surface and contribute to the opening of weed leaf surface. Therefore, a large amount of herbicide is absorbed to achieve the purpose of improving the herbicidal effect. After the soil treatment herbicide is absorbed, it will be transported upward with a large amount of moisture, which is advantageous for inhibiting 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 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 high temperature and the activity of most herbicides during strong sunlight. 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 herbicides can fully exert their 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 air temperature 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 spread of the liquid on the leaf surface, but also inhibit the opening and respiration of the pores, lenticels and physiological activities of the weed leaves. There will be restrictions, weeds grow slowly, and their ability to absorb herbicides will be greatly reduced, which will also inhibit and affect the efficacy of herbicides.
1. The "negative" influence of wind and rain and its countermeasures
The test results show that the herbicide can be reduced by about 5% when the herbicide is sprayed under a wind speed of more than 8-10 m/sec. At the same time, the herbicide mist sprayed under the action of the wind can also drift to the other sensitive crops nearby to cause phytotoxicity. Therefore, the herbicide should be stopped under high wind conditions. Timely rainfall and appropriate rainfall (10-15 mm is preferred), which is beneficial to soil treatment of herbicides. The reason is that the rain can accelerate the diffusion 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. The "negative" influence of temperature and humidity and the 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 effect at the action site of the weed. 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 also the detoxification effect of the crop body will be slow due to low temperature, which is easy to induce phytotoxicity. The temperature of applying the herbicide is preferably 20 ° C to 30 ° C. Air humidity also has an obvious effect on the efficacy of herbicides. Applying stem and leaf herbicides in the case of relatively high air humidity can prolong the residence time of herbicides on weed leaf surface and contribute to the opening of weed leaf surface. Therefore, a large amount of herbicide is absorbed to achieve the purpose of improving the herbicidal effect. After the soil treatment herbicide is absorbed, it will be transported upward with a large amount of moisture, which is advantageous for inhibiting 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 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 high temperature and the activity of most herbicides during strong sunlight. 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 herbicides can fully exert their 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 air temperature 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 spread of the liquid on the leaf surface, but also inhibit the opening and respiration of the pores, lenticels and physiological activities of the weed leaves. There will be restrictions, weeds grow slowly, and their ability to absorb herbicides will be greatly reduced, which will also inhibit and affect the efficacy of herbicides.
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