How to prevent wheat from freezing injury? What are the different methods between weak seedlings and strong seedlings?

The severe cold in the 24 solar terms is the coldest season, and extreme snow and ice weather will occur in some areas. In this season, we should pay attention to the freezing injury of wheat, pay attention to the weather in time and keep the wheat warm. The control methods of weak seedlings and strong seedlings of wheat are different. Strong seedlings have low cold resistance and are not easy to freeze. For weak seedlings, freezing injury is easy to occur and later planting is needed.

In order to prevent wheat from freezing injury, it is necessary to pay attention to extremely cold weather, which has a great influence on crop growth. If the weather is too cold, the wheat seedlings will freeze to death and there will be no harvest next year. Therefore, it is necessary to guard against extremely cold weather during wheat planting. We need to pay attention to the weather when planting wheat. If extreme cold weather comes, we need to cover the wheat field with plastic film in advance, which can help the wheat seedlings survive and keep warm to a certain extent, and the wheat can grow better after the extreme cold weather passes.

Weak seedlings should be sown later, and wheat should be sown later to avoid freezing injury. Years ago, because of the low accumulated temperature, the seedling vigor was weak and there was little nutrition in the seedling. Compared with strong seedlings, the ability to resist cold and freezing is relatively weak. Leaves will dry, turn yellow and wither. There are also a few weak seedlings that continue to grow after the cold winter, but they are prone to freezing injury after encountering low temperature again.

In addition, in order to prevent the freezing injury of weak seedlings in winter, farmyard manure can be widely used during wintering, which can not only improve soil fertility, but also be more conducive to the growth of wheat seedlings. If weak seedlings suffer from freezing injury, rapid water and fertilizer application, topdressing with urea and spraying potassium dihydrogen phosphate can also promote seedling growth.

After the growth period, especially after the vernalization stage years ago, Wangmiao will have jointing in advance, at this time, the cold resistance of wheat seedlings will decrease, and after the cold resistance decreases, Wangmiao will be frozen by low temperature. Severe low temperature freezing injury is likely to cause wheat to freeze to death at tillering stage and main stems and leaves. Faced with this situation, it is only necessary to turn over the sun on both sides of the land on sunny days, and then suppress the soil after thawing to inhibit the growth of some wheat seedlings on the ground and reduce the occurrence of freezing injury. In the early stage of freezing injury, that is, when seedlings turn green, topdressing should be done in time to promote the growth of wheat branches and leaves.

Top dressing should be done in time during the wheat turning green. In order to ensure the survival of most tillers, it is suggested to choose the corresponding high-nitrogen compound fertilizer when topdressing, in which phosphorus can better promote root growth, especially potassium resistance, and promote tillers and root growth. Before watering, when watering the sold fields, the temperature should be controlled above 5℃ to avoid freezing damage to the soil. In the early stage of winter wheat seedlings, it is necessary to spray and release growth regulators as soon as possible to cultivate strong seedlings and increase cold resistance.

In short, in order to make wheat seedlings survive the winter smoothly, it is necessary to pay attention to the weather and prepare for freezing injury in advance. We can do top dressing and watering before the growth period of wheat seedlings in advance, so as to avoid the lack of nutrient absorption of wheat seedlings in extremely cold weather, which will lead to large-scale necrosis of wheat seedlings. According to the different growth characteristics of strong seedlings and weak seedlings, we can adjust the topdressing time and amount, and pay attention to the topdressing amount, so that wheat seedlings can absorb nutrients and grow sturdily.