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 are generally safe for the crop being grown. They work best when applied before the weeds emerge, providing a protective barrier in the soil to prevent weed growth.
2. Triazine herbicides, including atrazine, simazine, and cyanazine, are also selective pre-emergence herbicides. They are widely used to control both grassy and some broad-leaved weeds. However, these herbicides tend to persist longer in the soil, which can lead to phytotoxic effects on sensitive crops if not used carefully. Farmers should always follow label instructions and consider crop rotation plans to avoid long-term damage.
3. Compound herbicides combine amide and triazine types, offering broader weed control with reduced risk of injury. Examples include mixtures like ethylene chlorohydrin, ethyl ester, and others. By combining different active ingredients, these formulations target a wider range of weeds while minimizing the chances of resistance development. This makes them a popular choice among farmers looking for efficient and safe weed management solutions.
When applying these herbicides, it's important to keep the following tips in mind:
1. Apply the herbicide after corn has been sown, ideally before most weeds have emerged. It's essential to use enough water to ensure even coverage and form a proper herbicide layer on the soil surface. This helps the chemical remain active and effective for longer periods.
2. If weed pressure is low, consider using mixed formulations such as Yihetang, Yichuangcaozhi, or Dudaotang. For small infestations, especially with young weeds, you can add about 150 g of 20% paraquat to the mixture. This will help eliminate any unemerged or newly emerged weeds, improving overall control and reducing the need for multiple applications.
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