The timely winter irrigation can meet the need of soil moisture for the overwintering of wheat in winter, stabilize the ground temperature, reduce the temperature difference between day and night, and have obvious cold-preserving and seedling protection effects. It is an effective measure to cultivate strong seedlings before winter. It is worth noting that the production should be based on the temperature to decide whether to perform winter irrigation.

Poor growth of late wheat leaves, or lack of single seedlings, the late part of this type of wheat field water poured late, and the weather is getting colder, the soil evaporation gradually slows down, generally can save you. In order to take advantage of the effective accumulated temperature in the winter-spring gap, to promote the growth of wheat seedlings, it is not appropriate to use the winter irrigation in the absence of the bottom squat, and other wheat fields should be arranged according to the seedlings.

The temperature index suitable for winter irrigation is an average temperature of 3°C or more, winter irrigation is too early, and freezing water is not available. If the winter irrigation is too late, the water pouring on the day will not go. If the ground is frozen, it will cause dead seedlings.

As for the winter irrigation, whether or not to top-dressing, mainly based on seedlings, in principle, is to promote the weak and strong, strong but not prosperous, according to local conditions, timely and appropriate. For the second and third types of wheat fields with insufficient base fertilizer, few seedling numbers, poor growth, and long-dehydrated wheat fields with early sowing, both should be combined with winter irrigation, and the top dressing amount can account for 30% to 40% of the total fertilizer. For example, if wheat is cultivated for 20 kg of urea, it can recover 6-8 kg before winter, which has a significant effect on increasing tillering and raising spike rate. For a type of seedlings with sufficient base fertilizer and strong seedlings, it is generally not appropriate to apply low-fertilization or excessive fertilization in order to avoid excessive delivery in the spring and the group is too large, which leads to passive management in the middle and late stages or causes lodging of the late wheat fields.

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