In the past 10 years, China's chemical herbicides have developed rapidly. The currently used chemical herbicides mainly include quenching and selective chemical herbicides, while the dry field herbicides mainly use selective herbicides, and the selective herbicides also block the pre-emergence herbicides and the post-emergence herbicides treated by stems and leaves. There are many varieties of herbicides and high application technology requirements. Therefore, farmers choose the herbicide varieties on the road and master the use of technology is the key to popularization of herbicides in agricultural production.
Weeds in wheat field chemical weeding wheat fields are common and widespread, with long growth period and serious damage. Due to the different types of weeds in different regions and plots, the herbicides have different sensitivity to different weeds. Therefore, it is necessary to find out the main weed species in the local block and select the herbicides on the road. Achieve the desired herbicidal effect.
Generally, the wheat fields are mainly weeds such as wheat malt, leeks, pork mites, sown wormwood, sage, sage, scorpion, and rice. It is recommended to use 75% of the superstar dry suspending agent per gram of acre, or 40% of the chlorpyrifos granules per mus of 2 grams, or 10% of merlot dry suspension of 10 grams per acre, or 72% of 24-D butyl emulsifiable concentrate 50 ml per mu, or 48% paraquat water agent 16 ml per acre, or 20% metformin water spray 150 ml per acre 40 kg of water spray.
In the areas of Luzhong, Lunan, Jiangsu, Henan and other parts of the wheat field, the lacquer (pork eye), the piglet, the wheat grass, the snail, the scorpion, the scorpion weeds are serious, and 50% of the good things can be used. Granules 3 grams per acre or 40% fast-killing suspension concentrate 4 grams per acre, or 20% to make it a 50-60 milliliter per acre of milk spray 40 kg of water.
Some rice stalks in Jiangsu, Lunan and the Yellow River have wheatgrass weeds such as wild oats, alfalfa, maiden, foxtail, hard grass, etc., which can be used with 6.9% Hummer EC 50-60 ml per mu. Kilogram spray.
In the mixed area of ​​grass weeds and broadleaf weeds, the weeds are equal and superior. It is recommended to use 6.9% Hummer 50 ml per mu and a mixture of Allusda 24-D butyl ester and dimethyl tetrachloride.
Appropriate period and method: There are many varieties of herbicides in wheat field, and the use period and method are the same. Winter wheat weeding can be carried out twice in winter and spring. Winter control generally takes place after the two leaves of wheat in mid-November, when the temperature is not lower than 5 degrees Celsius, and in the middle of March, the temperature rises above 5 degrees Celsius, and the wheat is carried out before the jointing. Tests have shown that the winter control effect is better than the spring control effect, and the traditional spring control gradually develops into winter. The above-mentioned medicines are all treated with stems and leaves, and evenly spray 40 kg of water per acre to make the weeds fully medicinal liquid, in order to achieve the desired control effect. Note that the temperature is less than 5 degrees Celsius, the effect of the drug is poor, the drug is not safe after the jointing of the wheat, 24-D butyl ester must be a special sprayer.
The weeds in the cornfield chemical weeding corn field are mainly crabgrass, goosegrass, foxtail, sorghum, sorghum, and sorghum. The weed species are few, the growth is fast, and the short-term control is short, which is easy to cause grass shortage. Generally, the ground treatment of pre-emergence weeding, post-emergence weeding is also being promoted, and mastering the appropriate control and use methods is the key.
Maize field weeding before germination, commonly used herbicides have 40% hydrazine water suspension agent 150-300 ml per acre, 50% Dua mixture 150 ml per acre, 40% atrazine suspension agent 150 ml per acre, 90% Wones emulsifiable concentrate is 100 ml per acre, and 72% Duer emulsifiable concentrate is 150 ml per acre. The time of administration is before the emergence of seedlings after sowing, and no later than the use of weeds 2 leaves. The corn live field is sprayed with 40 kg of water per mu, and the wheat field is harvested. The wheat is harvested at a height of at least 50 kg per mu. The intercropped corn field is used to spray the amount of water per acre before harvesting. Can be used in half.
Weeding after germination in corn field, the best herbicide currently promoted is 4% Yu Nong Le Suspending Agent with 50-60 ml per mu, 2.25% Kang Shi (Maize Star) emulsifiable concentrate with 120 ml per mu, in weed 3- At the 5 leaf stage, evenly spray 40 kg of water.
In recent years, peanuts and soybean fields have been chemically weeded in recent years. The area of ​​peanuts and soybeans has risen steadily, and chemical weeding has been widely applied. The main weeds are crabgrass, goosegrass, foxtail, valerian, purslane, sauerkraut, gray ash,è—œ, 蓼, å°æ—‹èŠ±, etc., the dominant weed population is transformed from monocotyledonous to monocotyledonous.
Pre-emergence weeding: After sowing peanuts and soybeans, 72% Duer emulsifiable concentrate can be used 100-150 ml per mu, 33.3% Shitian emulsifiable concentrate is 100-150 ml per acre, and 90% Wones emulsifiable concentrate is used per 100 mu. ML, 50% acetochlor EC 200 ml per acre, 40 kg ground spray per acre, can control annual grass weeds and some broad-leaved weeds. The dicotyledonous weeds are more common with the monocotyledonous weeds. The 50% quick-wrinkable wettable powder is 4g per mu plus 90% Wones 60ml per acre and 40kg of water, which can effectively prevent common monocots. , dicotyledon weeds.
Post-emergence weeding: After sowing peanuts and soybeans, weeds 3-5 leaf stage, use 6.9% Weiba 40-60 ml per mu, 10.8% efficient grass cover can use 25-30 ml per acre, 15% fine kill 40-50 ml, 12.5% ​​take 40 ml per mu, 4% spray 40 ml per mu, 20% fine grass grass 30 ml per acre, spray 40 kg of water on stems and leaves, can prevent annual grasses Weeds. Use 24% gram of Lele 8-10 ml per acre, 25% of Huwei with 60 ml per acre and 40 kg of water, which can effectively prevent common broadleaf weeds.
Chemical weeding of melon vegetable field weeding vegetable field: onion, ginger, garlic, leeks, potatoes, onions, cabbage, rape, celery, coriander, carrot, eggplant, pepper and other vegetable fields are better than artificial weeds, both provinces Work, labor and increase production. Vegetable field pre-emergence herbicide can choose 3.3% Shitian emulsifiable concentrate 100-150 ml per mu, 72% Duer emulsifiable concentrate 100-150 ml per acre, 43% colostrum emulsifiable concentrate 250-300 ml per mu, 23.5% mowing grass per acre 30 ml of mu, 48% trifluralin EC 80-100 ml per mu, sprayed on 40 kg of water on the ground. The post-emergence herbicide can be used with 6.9% Weiba 40-60 ml per mu, 10.8% high-efficiency grass cover can be 25-30 ml per mu, 12.5% ​​can be netted 40 ml per mu, 15% fine kills 40-mu per acre. 50 ml, 20% fine grass grass with 30 ml per acre, spray 30-40 kg of water on the stem and leaf respectively.
Chemical weeding in the arched watermelon field: the north arch shed and the cover film anti-season watermelon develop rapidly, the watermelon planting method is more, the melon agricultural chemical weeding requirements are urgent, and the multi-year screening test shows that the watermelon is sensitive to various agents, comprehensively its safety and control effect, Duer It is best used for weeding before buds in watermelon fields, but it requires strict and correct calculation of dosage. The Dole label indicates that the dosage per acre is 100 ml, while the area of ​​watermelon in the general arch shed accounts for one-third or one-quarter of the total area. Therefore, 25-33 ml per acre is applied to the actual greenhouse.
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