In many areas, farmers are accustomed to weeding wheat fields in spring. Many farmers even think that the ground temperature is low in winter and there should be no weeds in the field. In fact, many weeds in wheat fields have similar characteristics to winter wheat, and they grow across the year, such as amaranth and wild oats. In winter, the weed tissue in the wheat field is young and thin, and the waxy layer is thin. In addition, the wheat seedlings are small, the canopy degree is small, the exposed area of ​​weeds is large, and the resistance is poor. It is beneficial for weeds to absorb more pesticides and improve weeding effects. At present, seizing a favorable period and carrying out weeding before winter can greatly reduce the base number of weeds in wheat fields, significantly reduce the cost of medicine and labor, and promote the increase of income in the coming year. Select the corresponding herbicide according to the weed type There are many types of herbicides, and each herbicide has a certain herbicidal spectrum. The appropriate herbicide should be selected in different places according to the type of weeds in the wheat field: The first is a wheat field mainly based on Mai Niang and Japanese Mai Niang, using 60 to 80 ml of oxazoline and acetochlor EC per acre, or 80 to 100 ml of 6.9% fine oxazole and grass grass water emulsion, 40 for water. Kg, spray after weeds have been planted. The second is a wheat field with hard grass and yarrow as the main component. 25% isoprone wettable powder and 50% isoprolong wettable powder can be used. 75 grams of active ingredient per acre is used. After sowing to the 3-leaf stage of wheat seedlings. Spray on 40-50 kg of water. After the weeds have been sprayed, spray 70-90 ml of oxazoline · northrin-methyl emulsifiable concentrate or 90-110 ml of 6.9% fine oxazole grass herb water emulsion per mu. Third, wheat fields with broad-leaf weeds such as cilantro, amaranth and other broad-leaved weeds. Before winter, use 20% clofloxacin EC (20-25 ml per acre) and 20% dimethyltetrachloride 150 ml. Spray prevention. You can also choose 36% oxadiabensulfuron-wettable powder, spray 5 to 7.5 grams per acre after weeds are ready. Choose the best control period Before the three-leaf stage of wheat, the resistance of wheat seedlings was very poor. The treatment at this stage could easily cause wheat phytotoxicity. The lighter leaves were distorted and affected the yield. Generally, from mid-November to early December, wheat seedlings grow to more than 4 leaves, and weeds are almost uniform. This is the best time for weeding in wheat fields. Farmers should pay attention to the weather forecast in advance and choose continuous sunny days. Generally, there will be no frost and heavy rain in 4 days. The temperature on that day is higher than 8 ° C. It is advisable to carry out from 10 am to 4 pm. In addition, farmers are better to take advantage of the opportunity after the rainfall to apply medicine. Fields with severe drought should be irrigated and drained before spraying. It should be noted that the effect of the herbicide is significantly slower in the low temperature in winter than in the high temperature in summer and autumn. Therefore, you must wait patiently after the application in winter. As long as the timing is good and the liquid is sprayed in place, you do not need to re-administer the drug. Safe use When using herbicides, strictly follow the technical operating procedures to avoid various types of phytotoxicity. The first is to improve the quality of medication and avoid damage to wheat seedlings. When spraying herbicides in winter, water should be added strictly according to the dilution factor. Do not reduce the amount of water at will. When spraying, pay attention to thoughtful, uniform, non-re-spraying and leak-proof spraying. The amount of herbicide per acre is small. It is best to first use water to form a mother liquor and then pour it into a sprayer filled with water, that is, to dilute it twice. The second is to prevent herbicides from drifting. Because the winter temperature is low and often accompanied by strong winds, it should be applied during the periods of no wind or breeze where the temperature is relatively high on sunny days to ensure the efficacy and avoid the harm. According to experience, after December, weeds in wheat fields, especially isopropylon herbicides, are not effective in controlling weeds. Weeds have a strong physiological metabolism when the temperature is high in sunny days, which is beneficial to the weeds in the weeds. Conduction, easy to receive better weeding effect. In addition, it is best to use a special sprayer for spraying herbicides. Be careful not to contaminate the water source with the liquid before and after spraying. 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