In wheat fields, effective chemical weed control requires careful consideration of seedling conditions and the type of growing medium. Different herbicides should be selected based on the specific needs of the crop and the types of weeds present. Below are several herbicides that can be used for this purpose:
1. **6.9% Hummer Gel Suspension or 10% PUMA Emulsion** – These products are effective against a wide range of monocot weeds. For each mu (approximately 667 square meters), apply 40–80 ml of 6.9% Hummer gel suspension or 30–50 ml of 10% PUMA emulsion in 30 kg of water. The best time to spray is when the wheat has 3–5 leaves.
2. **Baijia Mixture** – This combination is ideal for controlling broadleaf weeds, especially tough ones like swinecress and spring bristle. Mix 10–12 ml of 48% Butachlor per mu with 125–150 ml of 20% 2,4-D aqueous solution, and spray with 30 kg of water. Apply this mixture between the 3-leaf stage and before the wheat begins to joint. It should only be used on crops that will later be followed by rice.
3. **75% Superstar Dry Suspension** – This product effectively controls a wide range of broadleaf weeds. Use 1–2 grams per mu, mixed with 30 kg of water. The optimal time for application is also during the 3–5 leaf stage of wheat.
4. **20% Make It Prolonged EC** – This herbicide is suitable for controlling various broadleaf weeds, including those that are hard to manage. Apply 60–100 ml per mu in 20 kg of water. Spraying should occur during the 3–5 leaf stage of the wheat plant.
5. **Toluene Mixture** – This formulation is effective against many broadleaf weeds. Combine 125 ml of 20% 2,4-D aqueous solution with 100 ml of 48% Bentazon aqueous solution, and spray with 30 kg of water. The best time to apply this mixture is after the wheat has jointed. Again, it should only be used on crops that will later be followed by rice.
To maximize the effectiveness of these herbicides, certain environmental factors must be taken into account. First, ensure that the soil moisture is sufficient. If it's too dry, increase irrigation before applying the herbicides. Avoid spraying when there is not enough moisture. Second, choose sunny days for application, as sunlight enhances herbicide activity. Third, aim for temperatures around 20°C, which is ideal for herbicide absorption. Finally, avoid windy conditions to prevent drift and damage to neighboring crops. By following these guidelines, you can achieve better weed control while protecting the health of your wheat crop.
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