First, the choice of agents based on the type of weeds in wheat field herbicides.

1. In monocotyledonous wheat fields, herbicides such as thrips, horses, horses and horses can be selected.

2. Wheat fields mainly composed of dicotyledonous broad-leaved weeds, tribenuron-methyl, thifensulfuron-methyl, and 2,4-D-butyl ester herbicides.

3. Single, dicotyledon mixed wheat fields, optional DuPont superstar or tribenuron plus tamarin mixed use.

Second, the best drug period wheat field chemical weeding the best period of application for the pre-winter wheat and wheat jointing the following year. At this time, the effect of medication is better, and it is safer for wheat, and it is worse at night. Among them, the sooner the better, the better the use of 2,4-D butyl ester. Tribenuron is best used before the wheat turns green to avoid the next Crops produce phytotoxicity.

Third, when the temperature and humidity during medication, the average temperature should be above 6°C in order to obtain better control effect. For example, tribenuron is sensitive to temperature, and the control effect can be demonstrated only after 15 to 20 days or even 30 days after the drug is applied under low temperature conditions. Therefore, all herbicides should be used when the temperature is high on sunny days, and it is advisable to use 10:00 am to 3:00 pm. If the soil is used for dry medicine, the amount of water should be increased to ensure the control effect.

Fourth, strict drug use should strictly control the dosage, can not be arbitrarily reduced or increased, so as not to reduce the control effect or produce phytotoxicity.

1. In wheat fields dominated by monocotyledonous weeds, 6.9% of mums are sprayed with 50 ml of water and 50 kg of water is sprayed, and the control effect is more than 90%.

2. In wheat fields dominated by dicotyledonous grass, use tribenuron-methyl per acre with 1.2 grams or 2,4-D butyl ester for 50 milliliters per mu, and water for 30-40 kg spray.

3. Single and dicotyledon mixed wheat fields can be sprayed with 6.5% Fuma 50 ml plus 7.5% superstar suspension agent 1 g plus 20% to make it 30 ml of water and 50 kilograms of water spray. The effect is excellent.

Fifth, medication methods

1. Use herbicides to apply evenly. We should try to make the liquid wetting stems and leaves of weeds, but the liquid can not be inflow, and do not re-spray, no leakage spray, water consumption per mu is not less than 30 kg.

2. Correctly master the preparation method. First, the original drug is formulated as a mother liquor, the sprayer is properly added with water, then poured into an appropriate amount of mother liquor, and finally, mixed with fresh water.

3. After the herbicide is added to the water, it is best to add a small amount of neutral detergent to the liquid to increase the adhesion of the liquid to the weed blades and improve the efficacy.

4. Spraying should be performed under conditions of no wind or breeze. When there is wind, no spraying can be performed to prevent the liquid from drifting.

5. The sprayer should be strictly cleaned after use, otherwise it will cause phytotoxicity to other crops.

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