Choose a herbicide with less residual soil
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August 02 08:32:17, 2025
When choosing herbicides, it's essential to select those that break down quickly in the soil or within plant tissues, with a short residual effect. The following **pesticides** are recommended by the **China Pesticide Network**, and can be used as needed depending on the situation.
Benzorone is effective for a short period in the soil and does not harm crops, making it particularly safe for wheat. It is ideal for controlling grassy weeds like wild oats before the 5-leaf stage, and can also be used for broad-leaved weeds in wheat fields with 2 to 4 chlorine atoms. To enhance its effectiveness, surfactants such as ammonium sulfate, vegetable oil, or mineral oil can be added during application.
Another option is a herbicide with a very short soil half-life, which has no impact on the crop. This type is suitable for use on dicotyledonous crops and vegetables like soybeans, sugar beets, rapeseed, flax, and cotton.
Three other herbicides—pentachlorophenol, dinitrophenol, and dinose—are known for their relatively short persistence in the soil, typically lasting 2 to 4 weeks. However, once absorbed by animals, they are difficult to metabolize and can accumulate in their bodies, making them highly toxic. Therefore, these should not be used in rice paddies where crabs or fish are raised.
According to the **Pesticide Network**, acetochlor and butachlor are herbicides that degrade quickly in the soil, usually within 1 to 3 months. These compounds have low volatility and are easily broken down in plants. Due to their widespread use, it's important to rotate between different types to prevent resistance. Glyphosate stands out as a highly efficient, broad-spectrum herbicide with low toxicity and easy degradation, making it environmentally friendly. It is ideal for use in orchards, along roadsides, and in non-cultivated areas.
Trichlorobenzoic acid, legumin, and another herbicide have a shelf life of 6 to 12 weeks in the soil. Trichlorobenzoic acid and the other herbicide are suitable for wheat and corn fields, targeting perennial deep-rooted broad-leaved weeds such as milkweed, thistle, and chicory. Bean Kewei is appropriate for crops like soybeans, peanuts, corn, sunflowers, carrots, tomatoes, peppers, and sweet potatoes. It’s used as a pre-emergence treatment to control annual monocot weeds.
Dinitroanilines, including trifluralin and aminoethionine, are easy to apply and effective against weeds like cocklebur, crabgrass, goosegrass, foxtail, and barnyard grass. They are suitable for crops such as cotton, legumes, and cruciferous plants.
The herbicide 2,4-D has a soil persistence of 2 to 8 weeks. The lower the temperature and the drier the soil, the longer the herbicide remains active. It is commonly used on cereal crops like wheat, rice, and corn to control both annual and perennial broad-leaved weeds through foliar application.
Sinfluorfen degrades rapidly in the soil and has a short residual effect. It is suitable for crops such as soybeans, cotton, tobacco, peanuts, and rice, and is applied as a pre-emergence treatment to control annual grasses and broad-leaved weeds.
By carefully selecting and applying these herbicides, farmers can effectively manage weeds while minimizing environmental and health risks. Always follow the guidelines provided by local agricultural authorities and the **China Pesticide Network** to ensure safe and sustainable use.