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Wheat Weeds and Chemical Weeding Technology Wheat weed control has the following advantages: first, weeding effects are good; second, time saving and labor saving; gradually, we are highly valued by governments at all levels and loved by farmers, and the area of ​​weeding is expanding year by year. Weeding techniques have been rapidly popularized. Promotion. However, due to the improper use of herbicides by some farmers, not only did the seasonal crops reduce production, but it also caused damage to the crops. In order to economically, safely and effectively control weeds in wheat fields, the following methods should be adopted when removing them. First, to look at wheat fields such as Acacia, wild oats and other grass weeds. Each mu with 6.9% Hummer 40-60 ml, 50 kg of water spray; per acre medication can not exceed 120 ml, otherwise it will produce phytotoxicity on wheat. Second, the wheat field weeds in pigs, big nest dishes, sow wormwood, Braga grass, leeks and other broad-leaved weeds mainly wheat. (1) Use 48% Bacillus per acre to spray 30-50 kg of water to 20 ml of water and use it before the jointing of wheat. After applying the herbicide, the weeds turned brown within 1 week and died within 7 to 14 days. The efficacy period can be over 40 days. The four forbidden periods of paraquat enemy are: disabled before sowing or after sowing (influencing seedling emergence rate); disabled before wheat four-leaf stage (easy to produce phytotoxicity to wheat crop); disabled after jointing (it can cause difficulty in heading and produce abnormal ear); Disable after panicle (can cause empty panicle ear, no granules). When spraying, the temperature is required to be above 10°C. The city is often used in pre-winter and early spring seasons. It is from late November to mid-December before winter, and from spring to early March after spring. The dosage per acre should not exceed 25 ml, and it is easy to produce phytotoxicity if it is too large. Paraquat enemy can not be mixed with organophosphorus pesticides, promote the use of mixed with 2,4-D, dimethyl tetrachlorine, poor control of motherwort, leeks, and Xanthium. (2) Uniform spraying with 75% superstars 1 gram per mu and 30-40 kg water. When the temperature is above 5°C during spraying and the weeds are in the second to the third leaf stage, when it is used to control swine fever, it should be applied in one leaf stage. The effect is good; the grass age is too large and the effect is poor. The spring application is applied before the beginning of March (early jointing period), and the superstar safe isolation period is 60 days (the wheat set spring peanuts and the wheat set melon fields should pay attention to 60 days sowing). (3) Use 50% of good things per mu for 3-4 grams of water 30-40 kg spray. The medicine has certain control effects on the valerian and mother-in-law. The advantage is that it is safe to wheat and has a long period of use. (4) Use 20% per acre to make it spray 40-50 milliliters to 30-50 kilograms of water, requiring a temperature above 5°C; use wheat after jointing needs to increase the dose, 50-60 ml per acre. The advantage is that applying too late is also safe for wheat, and at the same time it is better for mother-in-law. (5) 40% per acre fast dry suspension agent 4-5 grams of water 30-40 kg spray, can prevent a variety of 1-year-old broad-leaved weeds and Cyperaceae weeds, control effectiveness of more than 90%. It has good control effect on the small convolvulus, but it has poor control effect on the small locust and the big nest grass. 15 minutes after application was absorbed by weeds, 3-4 hours appeared toxic symptoms, 2-4 days weeds withered, application period should be in the wheat two leaf stage to jointing stage, weeds two to three leaf stage. (Li Pingfang, Agricultural Technology Promotion Center, Yingzhou District, Fuyang City, Anhui Province)