In summer corn fields, farmers often use herbicides like "Fuhua Yi A Mixture," "Corn Treasure," and "Yucao Jing" for weed control. However, the results are not always satisfactory, leading to frustration and suspicion that the products may be of poor quality. After expert analysis, it was found that the issue is not with the product itself, but rather several key factors that affect the effectiveness of the herbicides.
Firstly, the presence of wheat stubble can significantly reduce herbicide performance. In recent years, summer corn planting has largely taken place in previously harvested wheat fields. After wheat harvest, herbicides are applied directly to the remaining stubble. The weeds, however, are not fully exposed to the chemical, which limits its ability to work properly.
Secondly, drought conditions can also hinder the effectiveness of herbicides. During the period between wheat harvest and early July, high temperatures and dry weather are common. When herbicides are sprayed, the liquid evaporates quickly upon contact with the dry soil surface, preventing the formation of a protective film. This reduces the herbicide's ability to be absorbed by the weeds, thus decreasing its overall efficacy.
Thirdly, improper application methods contribute to the problem. Many farmers apply herbicides using forward-facing sprayers, similar to how they would spray other types of pesticides. This method doesn't allow the herbicide to spread evenly or form a proper coverage on the weeds. As a result, the chemical is often disturbed by foot traffic or wind before it can take effect.
Lastly, applying herbicides too late is another major issue. Most recommended herbicides should be applied when weeds are in their 2-3 leaf stage. However, due to the timing of wheat harvest, many weeds have already grown too large by the time the herbicide is applied, making them more resistant and reducing the treatment’s impact.
To improve results, China's Pesticide Network recommends the following tips: Before applying herbicides, ensure the field is cleared of wheat residue. If the area is dry, water the field first before spraying. Always use a backward-spraying technique to avoid disturbing the herbicide film. These steps will help ensure better coverage and maximize the effectiveness of the herbicides, leading to healthier corn crops.
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