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(1) According to the time of wheat sowing, the appropriate period of prevention and control shall be determined. After 25-30 days of general sowing, the weeds will basically reach the same level (about 95% of the total amount of grass). At this time, about 4-5 times of wheat will be removed. The best time.
(2) According to the temperature to determine the prevention and treatment time, grasp in the daily average temperature above 8 °C, rush in the cold tail warmer spraying herbicides, cold flow before the prohibition of herbicides to prevent injury caused by drugs.
Most of the weeds in the fields from late October to late November in my county have been out of control, and the weeds have a small leaf age, poor resistance to insects, relatively stable temperatures, and suitable plowed soil moisture. Wheat field weeds are more likely to exert normal control effects than spring control. Therefore, we should seize this favorable hunger and timely carry out chemical weeding in wheat fields.
Second, choose the right herbicide:
According to the species of weeds in the wheat field and wheat field (monocotyledonous weeds and dicotyledonous weeds), high-efficiency herbicides that are absolutely safe to the rear crops are selected. The more monocotyledonous weeds should be selected to kill monocotyledonous herbicides. Dicotyledonous weeds should be selected to kill herbicides dominated by dicotyledonous weeds. The dicotyledonous weeds were used in 10 acres of 10% methamphetamine or 15% of superstars. Monocotyledonous weeds in wheat can be used in 3 mu of 30 ml of 30% Shima oil suspension, 50 to 100 ml of adjuvant, 7 to 10% of tigers, and 2 to 3 grams of tigers, and 40 to 50 kilograms of water can be used to control stem and leaf spray. .
Third, scientific application
The key to herbicides is the uniform use of pesticides, the correct method and dosage of herbicides, and the selection of the herbicide should be carried out at noon on sunny days above 5°C. The secondary dilution method is used when applying pesticides, and water consumption can be increased for low humidity fields.
According to the survey, there are many farmers in our county with insufficient water consumption, only 15 to 22 kilograms per mu water (a sprayer), because of the small amount of water, spray faster when spraying, resulting in missing spray, affecting the overall weeding effect. Water consumption per mu is generally 30-45 kg, so as to ensure good control effect.
Wheat pre-winter weeding technique
First, weeding time: