1. Reasonably determine the time for pouring frozen water. Watering time is most suitable for "night freezing and depleting," generally before and after the low snowfall in late November, when the daily average temperature begins at 7°C to 8°C, and ends at about 4°C to 5°C. Irrigation is too early, the temperature is high, and the amount of evaporation is too large to function as an insulative and heat-increasing plant. The wheat fields with good growth will also be prolonged due to the adequacy of water and fertilizer, which will cause serious jointing before winter and will easily cause freezing damage. Watering is too late. The temperature is low, the water is not easy to infiltrate, the formation of water, the surface of the frozen, after winter irrigation, the plants are susceptible to freezing damage. During the day, it should be chosen from 9:00 am to 4:00 pm.
2. Watering frozen water to see the situation, see the seedlings. For the wheat to be in suitable soil water content when returning green, generally the soil moisture content is insufficient, the soil moisture content of the cultivated layer sand land is less than 16%, the loam soil moisture content is less than 18%, and the clay ground is less than 20% should be winter irrigation. Above the above indicators, soil moisture is better and can be slow or no irrigation. For weaker seedlings with few leaves, few roots, and few tillers or tillers, especially for late-seeding seedlings, it is not appropriate to carry out winter irrigation. For wheat fields with large groups and strong growth, if there is good sensation, winter irrigation or non-winter irrigation may be postponed; A wheat field with sufficient fertilizer may not pour over winter water.
3. Irrigation should be appropriate. The amount of irrigation water should not be too large. It is advisable to be able to seep through the water on that day. It is advisable to flood the area with water, and to form a frozen layer. General irrigation volume of 45 to 50 cubic meters per mu. For fertility-deficit wheat fields, winter irrigation can be combined with topdressing, applying 5 to 8 kg of urea per mu. After the watering, it is necessary to carry out plan maintenance in time to increase the temperature of the ground, prevent cracks in the plate, cause wind damage, and cause dead seedlings.
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