Choose a herbicide with less residual soil
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August 02 08:30:43, 2025
When selecting herbicides, it's important to choose products 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 known for its short half-life in the soil and does not harm crops. It is particularly safe for wheat and effective against grassy weeds like wild oats before the 5-leaf stage. It can also be used to control broad-leaved weeds in wheat fields with 2 to 4 chlorines. To enhance its effectiveness, surfactants such as ammonium sulfate, vegetable oil, or mineral oil can be added during application.
Another option, which has a very short soil persistence and no negative impact on crops, is suitable for use on dicotyledonous crops such as soybeans, sugar beets, rapeseed, flax, and cotton.
The three herbicides—pentachlorophenol, dinitrophenol, and dinose—have a relatively short duration in the soil, typically lasting 2 to 4 weeks. However, once absorbed by animals, they are difficult to metabolize and can remain in their bodies, making them highly toxic. Therefore, they should not be used in rice paddies where crabs or fish are raised.
According to the **Pesticide Network**, acetochlor and butachlor have a short soil persistence, usually lasting 1 to 3 months. These herbicides generally have low volatility and are easily broken down in plants. Due to long-term use, it’s advisable to rotate between different types to prevent resistance. Glyphosate is highly efficient, broad-spectrum, and low in toxicity. It breaks down quickly in the environment and is considered safe 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, targeting perennial deep-rooted broad-leaved weeds such as dayflower, milkweed, and chicory. Bean Kewei is ideal for crops like soybeans, peanuts, corn, sunflowers, carrots, tomatoes, peppers, and sweet potatoes, and is used for pre-emergence control of 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 commonly used on cotton and legume crops, as well as cruciferous vegetables.
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 suitable for use in cereal crops like wheat, rice, and corn, and is applied post-emergence to control both annual and perennial broad-leaved weeds.
Sinuron degrades rapidly in the soil and has a short **pesticide** residue. It is suitable for use on soybeans, cotton, tobacco, peanuts, and rice, and is applied as a pre-emergence treatment to control annual grasses and broad-leaved weeds.