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Chemical weed control in farmland involves the targeted application of herbicides to eliminate weeds and protect crops. This method is efficient, time-saving, and effective, making it a valuable practice for farmers. Proper use of herbicides requires attention to several key guidelines:
1. Always prepare and apply herbicides according to the recommended dosage, method, and procedure. Never alter the concentration or application rate without proper guidance.
2. Understand the specific use and timing of each herbicide. For example, pre-emergence herbicides should not be used after crop emergence, and soil-applied herbicides are not suitable for foliar treatment.
3. Avoid phytotoxicity by applying herbicides during periods when crops are not sensitive. Using them during vulnerable growth stages can damage the crop.
4. For foliar herbicides, the best results are achieved when applied during the 2–6 leaf stage of weeds. At this point, the weeds are most susceptible to the treatment.
5. Soil treatment requires well-prepared and leveled fields for even coverage. The effectiveness of herbicides decreases in the order of sandy soil, loam, and clay soil. Therefore, adjust the dosage accordingly—use less on sandy soils and more on clay soils.
6. When controlling perennial weeds, increase the herbicide dose. Some contact herbicides may not be effective against these types of weeds, so choose a systemic herbicide instead.
7. Avoid spraying herbicides during high temperatures, humidity, or windy conditions. Ideal conditions include sunny days with light winds and temperatures between 20°C and 30°C. When spraying, align the nozzle direction with the wind to prevent drift and protect nearby crops.
8. Clean the sprayer thoroughly before using different herbicides to avoid contamination and ensure accurate application.
**How to Use Herbicides in Corn Fields**
Currently, the main types of herbicides available for corn fields are pre-emergence and soil-incorporated treatments. Common examples include Xuanhua E, Ma Bao, and acetochlor. These herbicides work by targeting weed shoots and roots, so they should be applied before weed emergence or during the early stages (2–3 leaf stage) for maximum effectiveness.
Soil moisture and organic matter content significantly affect herbicide performance. Well-moistened soil improves herbicide absorption, while dry conditions may lead to volatilization or photodegradation. High organic matter can bind herbicides, reducing their availability, so higher doses may be needed in such cases.
In no-till corn fields, increased water volume is often necessary to overcome the interference from wheat residue. This helps improve herbicide coverage and effectiveness. Always follow label instructions and consider environmental factors to achieve the best results.