Pesticide network: how to deal with low temperature herbicides

The weather has been quite unpredictable lately. One day it's sunny, and the next, snow lingers. During winter and early spring, both crops and weeds grow slowly, but weeds tend to outpace crops in terms of growth rate. This makes it essential to perform chemical weeding on winter crops. However, the effectiveness of herbicides during colder seasons is often less noticeable compared to summer or autumn when temperatures are higher. In some cases, the results may even be ineffective in the short term. The main reason for this reduced efficacy is that low temperatures hinder the release of herbicides. Additionally, the ability of weeds to absorb these chemicals is also diminished. As a result, the herbicide is absorbed and broken down more slowly by the weeds, leading to a weaker or even no effect at all. To improve the use of herbicides, the **Pesticide Network** has compiled several practical tips based on technical experience: 1. **Weather Conditions**: In winter and early spring, temperatures are usually low, and strong winds are common, which can reduce the effectiveness of the herbicide. It's best to apply the herbicide on warm, sunny days when weed metabolism is more active. This helps the herbicide move more effectively within the plant and increases the likelihood of a successful outcome. 2. **Even Application**: Always follow the recommended dilution ratio and avoid reducing the amount of water. When spraying, ensure thorough coverage without over-spraying or missing any areas. Every part of the target area should receive an adequate amount of herbicide. 3. **Use Different Application Methods**: Some herbicides work better when mixed with soil or fertilizer. For example, mixing the herbicide with fine soil, sand, or fertilizer creates a toxic medium that remains effective even in cold conditions. If using "Oatmeal Enemy," mix 500 grams of the herbicide with 50 kg of fine soil or sand, or with 7.5 kg of urea or 15 kg of superphosphate. A small amount of water should be added to help the mixture adhere properly. After application, thoroughly mix the treated soil or fertilizer into the ground to enhance effectiveness. 4. **Add Nitrogen Fertilizer to Improve Effectiveness**: When using 2,4-D sodium salt in wheat fields, mixing it with ammonium nitrate, ammonium sulfate, or urea can significantly boost its performance. The addition of nitrogen fertilizer reduces the surface tension and pH of the solution, improving the adhesion of the herbicide and enhancing its overall effectiveness. By following these techniques, farmers can maximize the efficiency of their herbicide use, even in cooler conditions. (Source: **Chinese Pesticide Network**)

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