Pesticide network: how to deal with low temperature herbicides

The weather has been unpredictable lately, with sunny days followed by lingering snow. During winter and early spring, the growth of both crops and weeds is slow, but weeds tend to grow faster than crops. This makes it essential to perform chemical weeding on winter crops. However, the effectiveness of herbicides during cold seasons is not as noticeable as in the warmer months of summer and autumn. Sometimes, the results are even unclear in the short term. The main reason for this is that low temperatures reduce the release of herbicides. Additionally, the ability of weeds to absorb the chemicals is also weakened, leading to slower uptake and breakdown of the herbicide, which reduces its overall effectiveness or even makes it ineffective. To improve the performance of herbicides, besides selecting the right type, the **Pesticide Network** has summarized some practical techniques: 1. **Weather Conditions**: In winter and early spring, temperatures are usually low, and strong winds often occur, which can hinder the effectiveness of the herbicide. It's best to apply the herbicide on a relatively warm and sunny day. At this time, weed metabolism is more active, which helps the herbicide move through the plant and is harder to break down, resulting in better control. 2. **Even Application**: Always follow the recommended dilution ratio and avoid reducing the amount of water. When spraying, make sure the application is thorough, without over-spraying or missing spots. Every part of the targeted area should be covered with the herbicide. 3. **Use Multiple Application Methods**: Some herbicides can be mixed with soil to create toxic soil or combined with fertilizer to make poisoned fertilizer. These methods are safer and more effective at lower temperatures. For example, when using "Oatmeal Enemy," mix 500 grams of the herbicide with 50 kg of fine soil, sand, or 7.5 kg of urea or 15 kg of superphosphate. A small amount of water should be added to ensure the herbicide adheres well to the soil or fertilizer. After mixing, thoroughly incorporate the mixture into the soil to enhance the herbicidal effect. 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 effectiveness. The addition of these fertilizers lowers the solution’s surface tension and pH, improving the adhesion of the herbicide and enhancing its performance. By following these tips, farmers can maximize the efficiency of their herbicide use, even in cold conditions. (Source: **Chinese Pesticide Network**)

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