In cotton fields, it is better to use weeds in addition to weeds.
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1. Annual grass weeds: Matang (grass grass, sedge grass), beef tendon (grass, semi-large pier), foxtail (gluten, wild grain seedlings), see Mai Niang (bark grass), Chloris (barkweed, brush head), valerian (flat grass), thousand gold (embroidery), teff and so on.
2. Perennial grass weeds: Bermudagrass (grass root grass, berm grass), white mulberry (thatch, maogan), reed (scorpion grass, luqi).
3. Annual broadleaf weeds: purslane (salmon, horsebell), alfalfa (ash and gray), anti-twig (English and English, wild leek), Solanum nigrum (wild grape, black grain, Black granules), Xanthium (Clown larvae, wild silkworms), small crickets (thorny vegetables, thorny vegetables), iron leeks (sticky broccoli), ramie (green ramie, wild ramie), hairy acid syrup ( Lantern grass, acid granules, etc.
4. Perennial broadleaf weeds: Tianxuanhua (small trumpet flower), rehmannia (mother dish), psyllium (wheel dish), dandelion (day lily), etc.
5. Other perennial malignant weeds: fragrant aconite (returning green, vanilla, fragrant vanilla, tricera), ball sedge, water sedge, cattle grass, stalk grass (Equisetum) and so on.
2. Herbicides suitable for controlling weeds in grasses 1. 6.9% Weiba concentrated emulsion (fine oxazole and grass extract): for herbicidal conduction selective stem and leaf treatment herbicide, rainfall does not affect the effect after 3 hours of application . Control the weeds of annual grasses, use 50-70 ml of water to spray evenly 20-30 kg of water; control perennial grass weeds, use 70-80 ml of water to spray 30 kg of water (Note: This medicine is safe for cotton, cotton It can be applied at any time during the growth period; it has good effect when the temperature is high, the soil moisture is suitable, and the weeds grow vigorously. When the temperature is low, the drought and the weeds grow slowly, the effect is poor. The decomposition in the soil is fast, and there is no post-crop crop. influences).
2. Covering grass (chlorofluridone, chlorofluorophyll): For strong systemic selective selective stem and leaf treatment herbicides, weed leaves, stems and roots can absorb and rapidly transmit weeds. It can kill unearthed weeds and kill weed seeds. It has good systemic absorption and is resistant to rain. It does not affect the efficacy after 1~2 hours of application. Control the annual weeds, use 40.50ml of 12.5% ​​emulsifiable concentrate; control the perennial weeds, use 60~100ml for the acre, 30kg of water.
3. Groxasol (Quinoxaline): It is a herbicide-selective stem and leaf treatment herbicide. The leaves absorb the whole plant upwards and downwards. The perennial weeds can inhibit the growth of underground rhizomes, and the systemicity is good. Raining 1 to 2 hours after application does not affect the efficacy. In the 3~5 leaf stage of weeds, the annual weeds are controlled, and 10% emulsifiable oil is used in 40~75 ml; the perennial weeds are controlled, and 75~100 ml are used in the mu, which are sprayed on 30 kg of water.
Third, to control the annual broadleaf weeds suitable herbicide Ke Kuole (milk fluoride grass): Germany Bayer production, for contact-selective herbicides, in the weeds 2 to 4 leaf stage, 24% emulsifiable milk 20~40 ml spray on water 30 kg. Cotton is resistant to this drug, but it may cause certain phytotoxicity to cotton under the conditions of high temperature, drought, low temperature and serious pests and diseases. It is characterized by leaf shrinkage and burn spots, but it can be 1~2 weeks. Back to normal.
4. Control of other perennial weeds or perennial grass weeds, perennial broadleaf weeds, etc. Suitable for herbicides in cotton fields 1. Glyphosate (Nongda, Feida): It is a systemic action Extinction-type chronic low-toxic herbicides are effective against a variety of weeds; cotton fields include perennial weeds such as thatch, reed, larvae, and squash, which can be used with 65% Feida soluble powder 50g and water 15kg. Gloves and medicinal liquids treat weeds, and the effect is very good, but do not let the liquid contact with cotton plants, so as not to cause the cotton plants to die.
2. Paraquat (grass-free, quick-grass): It is a kind of fast-killing herbicide, which is mainly used for contact killing. It can quickly kill plant green tissue, but it is not effective for non-green tissue, for plant roots and perennial Underground stems and perennial roots are ineffective, so there will be perennial weed regeneration after application. When there are large weeds in the cotton line, the use of 20% paraquat water agent 200~300 ml for water 20~30 kg can be added to the nozzle with a protective cover for directional spraying. Although it may cause local phytotoxicity to cotton plants, it does not cause cotton plants to die, which is the biggest difference from glyphosate.