Pendimethalin, also known as Buddhism, Herbicide, Shitianbu, is a contact-type soil blocking agent, which mainly inhibits cell division of meristematic cells, does not affect the germination of weed seeds, but in the germination process of weed seeds. The young shoots, stems and roots act after absorbing the drug. The dicotyledonous plant absorption site is hypocotyl and monocotyledon is a young shoot, and its damage symptoms are inhibition of shoot growth and secondary root growth. The drug has a wide spectrum of herbicides and has good control effects against a variety of annual weeds. At present, there are 33%, 50% emulsifiable concentrates, 3%, 5%, and 10% suspension agents on the market.
It has a wide range of weeding in the production of pendimethalin. It is suitable for rice, cotton, corn, tobacco, peanuts, vegetables (cabbage, spinach, carrot, garlic, onion, etc.) and orchard crops. It protects against crabgrass, foxtail, valerian and horse teeth. Annual grasses and broadleaf weeds such as crickets and crickets. The control effect on grass weeds is better than that of broadleaf weeds, which is not effective for perennial weeds. The herbicide has good binding to the soil, and is usually adsorbed by the surface soil layer after application to form a closed drug layer. After the weed seeds in the drug layer are germinated, the contact drug is killed; Weed seeds are easily killed when absorbed through the soil after germination. 1 For paddy fields: The southern rice region is often used for spraying seeds of direct seeding rice before germination, and the soil is closed. Generally, 150 g / liter of pendimethalin EC is used in an amount of 150 to 200 ml per mu. 2 For cotton fields: Live cotton field with 33% emulsifiable oil 150-200 ml per 15 to 20 kg of water, topsoil spray before or after sowing. 3 For rapeseed field: After sowing the soil in the live rapeseed field, the topsoil spray, using 33% emulsifiable concentrate per 100-150 ml. Transfer the topsoil 1 to 2 days before transplanting the rapeseed field, using 33% emulsifiable concentrate 150-200 ml per acre. 4 For vegetable fields: in the live field of garlic, ginger, carrot, leeks, onions, celery, etc., use 33% emulsifiable concentrate 100-150 ml per acre, 15-20 kg of water, and cover the soil after seeding. Pepper, tomato, leeks, green onions, onions, cauliflower, cabbage, cabbage, eggplant and other transplanted fields, using 33% emulsifiable concentrate 100-150 ml per acre, 15-20 kg of water, and 1-2 days before transplanting. 5 For soybeans, peanut fields: spring soybeans, spring peanuts, use 33% emulsifiable oil per acre 200 to 300 ml, 15 to 20 kg of water, apply soil and soil after land preparation, and then sow. Summer soybeans, summer peanuts, 150-200 ml of 33% emulsifiable concentrate per acre, 15-20 kg of water, 1 to 2 days after sowing, topsoil spray, application of pesticides too late to produce phytotoxicity. 6 For corn fields: Spring corn is used with 33% emulsifiable concentrate of 200-300 ml per acre, 15-20 kg of water, and soil surface spray is sprayed within 3 days before sowing. It is easy to apply phytotoxicity to corn after applying too late; summer corn Use 33% to 200 ml of 33% emulsifiable concentrate per acre, 15 to 20 kg of water, and spray the topsoil within 3 days before seeding. 7 For orchards: Before the weeds are excavated, use 300% to 300 ml of 33% emulsifiable concentrate per acre, and spray water on the topsoil.
When using pendimethalin, some places often have some phytotoxicity. The reasons are nothing more than the following: 1 The crop is too shallow. The seed is in the drug layer, and the amount of the drug absorbed after germination is large, and it is susceptible to phytotoxicity. Therefore, seed seeding depth is generally required to be 3 to 5 cm. In this way, the amount of drug absorbed in the initial stage of crop seed germination is small, and although the bud body absorbs the drug when it passes through the soil layer, the amount of the drug absorbed is low, and generally no phytotoxicity is formed. 2 Soil moisture is required to be applied when applying. Once the herbicide is combined with the soil, it is difficult to move. If the sensation is better when applying the medicine, the applied pendimethalin can diffuse downward and around, forming a strict medicinal soil layer of 2 to 3 cm thick to ensure the soil sealing effect. When the soil is dry after application, it is difficult to form a good soil layer, which will affect the control effect. Therefore, in order to increase soil adsorption and reduce the phytotoxicity of crops, the soil should be treated with water before applying the medicine, so as to increase the amount of soil adsorption and reduce the phytotoxicity to crops. If the soil moisture is too large after application, or if it is rained for a short time, the drug may enter the crop seed layer, which may easily cause phytotoxicity to crops, especially sensitive crops. 3 The dosage is too large. Many places where phytotoxicity occurs are caused by the use of drugs exceeding the requirements of use. If it is used for weeding in vegetable fields, it generally requires no more than 120 ml per mu; or because the spraying is not uniform, the local dosage is too large, resulting in phytotoxicity. Therefore, 33% pendimethalin emulsifiable concentrate should be applied in dry fields. The dosage should generally be above 150 ml to ensure the control effect. 120 ml per acre, the herbicidal effect will not be too good when the soil is dry. In use, according to the weed control effect of the crop affected field, the reasonable use amount of pendimethalin can be roughly estimated, and the dosage can not be arbitrarily increased. 4 medication too late. When used for weeding vegetable crops, if the vegetable seeds have sprouted or even started to emerge, the drug is greatly absorbed by the crop shoots after the application of pendimethalin, which is likely to cause phytotoxicity. Almost all crops are susceptible to serious phytotoxicity when exposed to pendimethalin at the seedling stage. Therefore, there are strict requirements on the time of administration, not too late, such as the use of 40% methyl acetochloramine emulsifiable concentrate for ginger, cotton, corn field to control annual grass weeds and broadleaf weeds, It is necessary to apply the medicine before the seeding of the crop, and it is strictly forbidden to use the medicine during the arching period. Ginger is used in 100-150 ml per acre, 125-175 ml per acre in garlic field, and 40-60 kg in water, and sprayed with soil to ensure safety and harmlessness. 5 Do not use during sensitive periods of sensitive crops and crops. Tomato, pepper and other solanaceous crops are sensitive to the drug. Usually, the crop is applied before the crop is transplanted. When transplanting, the soil should be moved as little as possible to reduce the damage to the soil sealant. If it is applied after transplanting, it must be sprayed in the field. It is not possible to spray the liquid onto the Solanaceae vegetable crop, especially the spray of the liquid onto the young heart. The use of pendimethalin in the 5-6 leaf stage after the emergence of the direct seeding rice, especially when the dosage is large, can show symptoms of phytotoxicity 2 to 3 days after the general use of the drug at a high temperature.
More herbicides, please pay attention to China Pesticide Network
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