When should wheat be watered with frozen water?

The suitable temperature of frozen water is: the daily average temperature is about 3℃. Excessive drought is easy to harden and crack, and the water loss is fast, indicating that the water is insufficient at the end of winter; If the winter irrigation is too late, the water will not easily seep down that day, and the wheat seedlings will suffer freezing damage due to the freezing of the surface; The key is to seize the right time.

According to experiments, in cold winter years, when the average temperature of the day is 0℃- 1.5℃, the ground will freeze to death. During the "heavy snow" solar term, the number of wheat spikelets irrigated in winter is less, which is 6.7% lower than that irrigated in early winter.

Practice in recent years has proved that the average temperature on that day has dropped to 7-8℃ (after the start of the winter festival1October 1 15) and reached about 3℃ (before and after the light snow festival), so it is appropriate to complete the pouring.

Reasons for watering wheat with winter water:

1. Pouring frozen water on wheat can make winter wheat seedlings have enough water, which is of great benefit to protecting tillers before winter and promoting new tillers, and can also play the role of using winter water in spring and preventing spring drought;

2. Improving the thermal conductivity of soil can effectively reduce the change of field temperature and prevent freezing injury and seedling death caused by violent temperature fluctuation;

3, it can make the soil sink, freeze and thaw weathered debris, make up cracks, eliminate overwintering bacteria and pests, and is beneficial to the tillering of the pier;

4. It plays the role of pressing alkali to protect seedlings in saline-alkali land and reduces soil salinization. In addition, winter irrigation can also promote microbial activities, accelerate the decomposition of organic fertilizer, and meet the growth of wheat after turning green.

Extended data:

Matters needing attention in winter irrigation of wheat:

1, the amount of irrigation water in winter shall be subject to thorough irrigation, and it is advisable to complete water seepage on the same day. Avoid floods.

When the weather is sunny and warm, it is best to water it from 9 am to 3 pm.

3, watering combined with topdressing. For wheat fields with insufficient base fertilizer, weak seedlings and small population, overwintering water can be combined with topdressing urea 5 ~ 7.5 kg per mu. Winter fertilizer is used in spring to promote the transformation and upgrading of wheat seedlings.

4. It is best to hoe and rake the wheat in time after pouring the frozen water. When people can get to the ground, hoe the wheat in time, break the hardening, prevent the ground from cracking, weed and conserve moisture. The upper part promotes Miao Zhuang, and the lower part promotes root system development.

Phoenix. Com- Dezhou: It is suggested that winter wheat with low temperature and arid climate should be watered early to turn green to prevent freezing injury.