Carrot field weeds generally include bluegrass, marmot, foxtail, crabgrass, amaranth, shovel, green scorpion, goosegrass, thousand gold, ragweed, sorghum, spicy scorpion, small ash, fragrant aconite More than 20 kinds. From late September to late November, weeds are in full bloom. Carrots are sowed vegetables, which grow slowly during seedling stage and are easily bullied by weeds. In the cultivation of carrots, some farmers will not use herbicides, or the improper use of herbicides will result in serious damage or no harvest. The following small series introduces the correct way to weed carrots. First, soil treatment before planting Soil treatment before sowing can prevent a variety of annual grass weeds and broadleaf weeds, and can be used for 5-7 days before sowing. 48% trifluralin EC: Control weeds such as crabgrass, goosegrass, valerian, foxtail, ginseng, medlar, medlar, and medlar. It is not effective against sedge and various broadleaf weeds. Before sowing, 100-150 ml per acre, and 40 kg of water for soil spray treatment. 48% dichlorfen emulsifiable concentrate: valerian, goosegrass, crabgrass, foxtail and some dicotyledonous weeds. Before sowing, 200~250 ml per acre, and 40 kg of water for soil spray treatment. Mixing soil 2~5 cm in time after application, the drug is easy to volatilize, and the soil mixing will not reduce the drug effect in time. This type of agent is more suitable for soil sealing treatment when the moisture is poor. It is easy to produce phytotoxicity in cold and humid weather and should be used with caution. Second, pre-emergence soil treatment after sowing Most of the carrots are spread in the field, and the density is high. The main post-emergence soil treatment is used in the production, which can prevent the annual grass weeds. Appropriate deep sowing and shallow mixing should be used during sowing. The following medicines can be used in production. 20% grass-killing water agent: control weeds such as crabgrass, valerian, maiden, leeks, medlar, thorny vegetables, bitter leeks. After sowing, the soil treatment before seedlings is 700~1000 ml per acre. 50% chlorpyrifos WP: It has anti-effect on annual single and double cotyled weeds. Before sowing, the acre is treated with 100 grams of soil, and it can also be used in the 1~2 leaf stage. 50% grass dan oil: control of valerian, cattle grass, striated grass, crabgrass, foxtail, goosegrass, maiden, scorpion, scorpion, purslane, scorpion and so on. After sowing, the soil treatment before seedlings is 300~400 ml per acre. 25% Ligulong wettable powder: soil treatment before sowing, 250~400 grams per acre. 20% dimetheramine phosphorus emulsifiable concentrate: organic phosphorus low toxicity, broad-spectrum, and internal absorption-type soil treatment of selective herbicides, can prevent weeds such as crabgrass, goosegrass, iron leek, and purslane. Before sowing, use before or after seedling, 250~375 ml per acre, 50 liters of water, and sprayed with soil. 72% metolachlor EC: It has more than 95% control effect on carrot weeds and more than 80% on other weeds. It does not affect carrot growth and weeds. The control period can continue to ripen the carrots during harvest. Before the seedlings are planted, the ground can be sprayed with 100 ml of water and 50 liters of water, and then the soil is closed. In addition, 33% dipentazone EC 150~200 ml or 50% acetochlor EC 100~150 ml, 72% propisochlor 150~200 ml, 96% sperm metolachlor EC 60~ 80 ml, etc., spray evenly with 40 liters of water. It can control a variety of annual grass weeds and some broad-leaved weeds. The amount of drug is too large, the field is too wet, especially in the case of continuous low temperature and rain, it will affect the germination and emergence. In severe cases, there may be a lack of seedlings and ridges. Third, soil treatment before sowing Pre-emergence soil treatment after sowing can control annual grass weeds and broadleaf weeds. In order to control some broad-leaved weeds such as shovel and purslane, and improve the herbicidal effect, the following herbicides or formulas can be used: 20% dimetheramine phosphorus emulsifiable concentrate 250~375 ml or 33% pendimethalin emulsifiable concentrate 100~150 ml+50% chlorpyrifos WP 50~75 g. 50% acetochlor EC 75~100 ml + 50% chlorpyrifos WP 50~75 g. 72% isopropyl oxalate emulsifiable concentrate 100~150 ml + 50% chlorpyrifos WP WP 50~75 g. 33% pendimethalin emulsifiable concentrate 100~150 ml + 24% oxyfluorfen emulsifiable concentrate 10~20 ml. 50% acetochlor EC 75~100 ml + 24% oxyfluorfen emulsifiable concentrate 10~20 ml. 72% metolachlor EC 100~150 ml + 24% oxyfluorfen EC 10~20 ml. 72% isopropyl oxalate emulsifiable concentrate 100~150 ml + 24% oxyfluorfen emulsifiable concentrate 10~20 ml. 33% pendimethalin emulsifiable concentrate 100~150 ml +25% oxaloin emulsifiable concentrate 75~100 ml. 50% acetochlor EC 75~100 ml +25% oxaloin emulsifiable concentrate 75~100 ml. 72% metolachlor EC 100~150 ml +25% oxaloin emulsifiable concentrate 75~100 ml. 72% propisochlor emulsifiable concentrate 100~150 ml +25% oxaloin emulsifiable concentrate 75~100 ml. The above drugs are sprayed with 40 liters of water to achieve a control effect on a variety of annual grass weeds and broadleaf weeds. However, it is not applicable to the repressed plot after sowing. It should be shallowly mixed or covered with thin soil after sowing. If the seed is exposed, it will be susceptible to phytotoxicity. Fourth, growing season stems and leaves weeding Gramineous weeds 3~5 leaf stage, 10% quizalofol emulsifiable concentrate 50~70 ml or 10% quizalofol emulsifiable concentrate 40~60 ml, 35% flurazepam emulsifiable concentrate 75~125 ml, 15% refined flurazepam emulsifiable concentrate 50~60 ml, 12.5% ​​enephidine emulsifiable concentrate 60~80 ml, 10.8% high-efficiency flupirtine emulsifiable concentrate 20~40 ml, 10% valerate emulsifiable concentrate 40~80 ml, 10% fenoxapropanol cream 50~75 ml, 24% ketene emulsifiable concentrate 20~40 ml, etc., 30 liters of stem and leaf spray with water. It has special effects on controlling grass weeds such as goosegrass, crabgrass, valerian, and foxtail, and is ineffective against broadleaf weeds. This type of medicament does not have a herbicidal effect, and the application should not be premature, especially when the grass weeds are not emerged. Precautions 1. The field should be deep-dryed, broken and flattened, applied with decomposed organic fertilizer, mixed with cabbage seeds, etc., to reduce weeds. Combined with seedlings and fixed seedlings for artificial weeding. 2. Before the planting, the soil treatment should be controlled, and the soil should be mixed 2~3 cm deep after the medicine. 3. Soil treatment before sowing, the application effect after emergence is poor, and it is easy to produce phytotoxicity. The application effect is good under the conditions of flat land and moist soil. Spraying should be carried out under clear and windless conditions. Do not damage the soil layer, otherwise it will affect the weeding effect. High temperature weather sprays after 5 pm. After the rain, it can be sprayed after the rain stops. After using the arch shed, the temperature inside the shed will rise, and weeding with turfgrass should be used. When the temperature exceeds 30 °C, the dosage should be reduced to reduce the phytotoxicity. 4. Stem and leaf treatment should master the spraying period, and avoid the application of high temperature weather to prevent phytotoxicity. At the same time, you should master the spray method and try not to spray it on the carrot plants. 5. Pay attention to the strict use of the method of use, the period of use and the amount of the drug, large-area weeding, should be used on the basis of small tests to prevent the occurrence of phytotoxicity. Diquatamide is not available. Never use carrots in fields where quinclorac is used. 6. If the medicine is not used properly, the carrot seedlings or the nearby planted vegetables have herbicide phytotoxicity. When it is found early, the leaf surface can be sprayed quickly with a large amount of water, and sprayed repeatedly for 2~3 times. Or quickly fill the water to prevent the scope of phytotoxicity from continuing to expand. It is also possible to rapidly increase the availability of quick-acting fertilizers such as urea to enhance the viability of carrots or adjacently grown vegetables and accelerate their ability to recover quickly. The above is the introduction of all the contents of carrot herbicides. From the above, we can see that there are many weeds in carrot planting, so we must choose the right medicine to completely remove the weeds. The weeds for this kind of medicine have also been introduced above. Everyone can refer to the reference for carrots. 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