1. Amide herbicides, such as alachlor, acetochlor, metolachlor, pretilachlor, and butachlor, are commonly used as selective pre-emergence herbicides. These products are effective against grassy weeds and generally pose a low risk to the crop being grown, making them a popular choice in many agricultural practices.
2. Triazine herbicides, including atrazine, simazine, and propazine, also fall into the category of selective pre-emergence herbicides. They are primarily used for controlling grassy weeds and some broadleaf weeds. However, certain triazine herbicides have a long residual effect in the soil, which can lead to phytotoxicity over time if not managed properly. Farmers should exercise caution when applying these products to avoid potential damage to subsequent crops.
3. Compound herbicides combine the properties of the two previous types, offering broader weed control with reduced risk of injury. Examples include mixtures like ethylene-based formulations or other commercial blends. By combining different active ingredients, these herbicides can target a wider range of weed species while minimizing the chances of resistance development and crop damage. This makes them a widely adopted option in modern weed management strategies.
To maximize the effectiveness of these herbicides, consider the following key points during application:
1. Apply the herbicide after corn has been sown, ideally before most weeds have emerged. It's important to use enough water to ensure even coverage on the soil surface, creating a consistent herbicide layer that will effectively suppress weed growth.
2. If the field has a low number of weeds, it’s advisable to use a combination product like Yihe Mixture, Yichuangcaozhi, or Du'ao Mixture. For small infestations where weeds are still young, adding approximately 150 g of 20% paraquat to the mixture can help control both emerging and newly sprouted weeds more effectively.
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