The current summer Corn planting has been completed, and the application of herbicides is now imminent. Several technical considerations in the field are outlined below to ensure effective weed management and crop safety.
First, after wheat harvest, if a significant amount of weeds have already emerged, it is essential to apply "kill" herbicides. Products like "Kirkham Trace," "Paraquat," and "Grass-Grow Spirit" are highly effective. The first two are contact herbicides that kill visible green parts of plants but do not affect the roots. This means that under favorable conditions, weeds may regrow later. In contrast, "Cigarin" is a systemic herbicide that takes time to show effects—usually about 15 days after application—but once it works, it kills the entire plant from the root, preventing regrowth. Therefore, it's better to use a "grass-and-Garlic" approach for long-term control.
Second, the commonly used herbicides for post-emergence weed control include "Erhide Mixture," "Yucaojing," and "Du'ahe Mixture." Typically, 200 grams per mu is recommended with 45 kg of water (equivalent to 3 sprayer loads). The effectiveness is good, but the amount of water matters. If too little water is used, the herbicide layer becomes thin, allowing resistant weeds to escape and reducing control efficiency. On the other hand, using excessive water dilutes the herbicide, also lowering its effectiveness. It’s best to use 45–50 kg of water per mu for optimal results.
Third, these herbicides can cause phytotoxicity when they come into contact with sensitive crops such as cotton, peanuts, soybeans, and vegetables. To prevent this, follow these guidelines: spray on windless days to avoid drift, lower the sprayer nozzle to reduce chemical spread, and use protective covers or directional nozzles when spraying near sensitive crops.
Fourth, if herbicides accidentally land on these crops, you can apply "Natural Brassin" diluted at 7500 times. It’s crucial to prepare the solution correctly. Start by dissolving 2 grams of "Natural Brassinolide" in 500 grams of warm water (around 40–50°C), then gently stir with a wooden stick for 2–3 minutes. This helps activate the compound. Next, add 7–8 kg of water to the mixture, stir for 1 minute, and then add 15 kg more. Finally, mix in 10 grams of urea and stir again. Urea not only provides nitrogen to the plants but also helps soften the leaf cuticle, allowing the solution to penetrate more effectively.
Fifth, in recent years, some farmers have resorted to applying herbicides like "Yu Nong Le" and "Yu Heng" directly over corn and weeds without proper timing. This practice is not recommended. The best time to apply these herbicides is when the corn has 4–5 leaves and the weeds have 3–4 leaves. Applying them after the corn has 7 or more leaves can lead to phytotoxicity, which may harm the crop.
Lastly, when managing pests in corn fields, insecticides can be mixed with herbicides. However, when using "Yu Nongle" and "Yuheng," it is important to note that they should not be mixed with organophosphorus insecticides. Instead, they can be safely combined with pyrethroid-based products. Always read the instructions carefully to ensure safe and effective application.
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