Chemical herbicides commonly used in corn fields
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1. Atrazine, also known as atrazine, is a 40% suspension in the form of a broad-spectrum herbicide commonly used in corn fields. After the corn is planted, it is used before emergence, that is, the atrazine is sprayed immediately after the corn is planted, and the dosage per acre is 200-300 ml. It should be noted that atrazine has a long-lasting effect in the soil. When the application rate is too large, it is easy to damage the sensitive crops (such as rapeseed). Therefore, the method of stem and leaf spray is generally used to remove weeds. Corn 3 to 5 leaf stage, weed 2 to 3 leaf stage.
2. Acetochlor acetochlor (50% emulsifiable concentrate) is the most herbicide in China. It is used before emergence of corn after sowing, and the dosage per acre is 150-200 ml. The herbicide is safe for soybeans and peanuts, so it is suitable for plots of corn, soybean and peanut intercropping. Acetochlor mainly controls annual grass weeds, and the control effect on dicotyledon weeds is poor.
3. Butachlor dosage form is 50%, 60% emulsifiable concentrate. It is used before emergence of corn after sowing. The dosage per acre is: 60% butachlor 125-150 ml or 50% butachlor 150-185 ml. Butachlor is safe for soybeans and peanuts, so it is suitable for plots of intercropping corn with soybeans and peanuts.
4. Acetylhydrazone is a compounding agent of atrazine and acetochlor. It is used before emergence of corn after sowing, and the dosage per acre is 200-300 ml. It should be noted that ethyl hydrazine can not be used for plots of corn, soybean and peanut intercropping, and only for plots of corn monocropping.
5. Keqi Ling Ke Cao Ling 45% suspoemant is a herbicide compounding agent developed by the Weed Research Laboratory of the Department of Agronomy, Shandong Laiyang Agricultural College. It is a new type of safe, efficient weeding for controlling mixed weed communities in corn fields. Agent. After three years of field trials, the use of ketochlor can prevent all kinds of weeds in summer corn fields, and the weeding effect is over 90%, with a retention period of 60 days. The best period of use is 10 to 15 days before emergence of corn or after emergence of corn, and the dosage of 200-250 ml is used. Before using the medicine, shake it thoroughly, and add the medicine to the sprayer to stir evenly after the water. The amount of water is 30-35 kg per mu. It should be used in windless weather to prevent the liquid from drifting to sensitive crops such as soybeans, peanuts and cotton.
6. The common name of the cable is alachlor (43% emulsifiable concentrate), also known as grass is not green. The cable is a selective pre-emergence herbicide that can be absorbed by plant shoots to kill the weeds during the shoots. Before the corn is planted, it is used before emergence, 150-300 ml per mu, 30-35 kg of water, and evenly sprayed. The cable is safe for soybeans and is therefore suitable for chemical weeding of corn and soybean intercropping plots.