In the autumn and winter seasons, weeds in wheat fields are more effectively controlled compared to those in spring. This is because the conditions during this time allow for better herbicide performance. The advantages include lower dosage requirements, higher efficacy, and minimal risk of phytotoxicity to subsequent crops. As local farmers often say: "No grass, no toxicity, easy and comfortable."
The most effective herbicides for this purpose include tribenuron (also known as Tribenuron or Tribenuron-methyl). Based on comparative experiments, the following formulations have shown good results: 10% Anhui Huaxing Meibao at 7.5–15g per acre, 10% Xuanhua Mai Lele at 10–15g per acre, 75% Gold Warehouse at 1–2g per acre, and 18% US DuPont Billion Force at 5–10g per acre. It's important to note that increasing the dosage improves effectiveness, but it also raises the risk of damage to intercropped crops like peanuts, cotton, and vegetables. On the other hand, corn and millet can tolerate higher rates.
Another group of herbicides includes 2,4-D Butyl Chloride or Dipotassium Chloride. These products are often sold under brand names like “Scoop†or “Cai Kuai Kuai.†However, they tend to be less effective and may cause phytotoxicity to wheat if not used carefully. Farmers should be cautious when using these products.
Before applying any herbicide, it's recommended to first prepare a concentrated stock solution with a small amount of water, then dilute it before spraying. Make sure to apply at least two sprayers per acre to ensure even coverage across the field.
The best time to apply the herbicides is after the second-leaf stage of wheat, typically between mid-November and early December. The application should be done when the temperature is above 5°C. While the effect may be slower in colder weather, it won't affect the final control outcome. It’s essential to follow the recommended timing to maximize efficiency and minimize crop stress.
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