Before planting cotton, it's important to manage weeds effectively to ensure healthy crop growth. Choosing the right herbicide is crucial for this process. According to the China Pesticide Network, there are several options available depending on the type of weeds you're targeting. For pre-emergence weed control in the soil, herbicides like trifluralin, lasso, acetochlor, butachlor, diuron, and pendimethalin are commonly recommended. If you need to control weeds that have already emerged, post-emergence herbicides such as glyphosate, paraquat, and clethodim can be effective.
For pre-planting application, a common recommendation is to spray 48% trifluralin emulsifiable concentrate at a rate of 100–150 ml per mu (approximately 667 square meters) mixed with 50 kg of water. It’s essential to apply it evenly and mix the solution immediately before use. Another option is to use 43% clomazone emulsifiable concentrate at 200–300 ml per acre, also diluted in 50 kg of water. This should be done before the cotton seeds germinate.
Once the cotton seedlings have developed about four true leaves, you can switch to foliar herbicides. A good choice is to use 50 ml of 50% emulsifiable concentrate of a selective herbicide, or 50 ml of 12.5% grass herbicide, both mixed in 50 kg of water. This helps control weeds without harming the young cotton plants.
When applying herbicides, it's important to follow these key guidelines: First, choose the appropriate herbicide based on the weed species and crop stage. Second, always measure the correct dosage to avoid under or over-application. Third, consider environmental factors such as temperature, soil moisture, and water quality when applying. Lastly, make sure to use dedicated equipment for each herbicide to prevent cross-contamination and ensure effectiveness.
By following these steps, you can significantly improve weed management in your cotton fields while minimizing potential damage to the crops. Always read and follow the manufacturer's instructions carefully, and if in doubt, consult local agricultural experts for personalized advice.
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