How to apply fertilizer to the wheat seedlings that have been damaged by freezing

At present, in the winter wheat producing areas of the middle and lower reaches of the Yangtze River in Jiangsu, Anhui, Jiangxi, Hubei, etc., it is the season of customary application of wax fertilizer. Taking Yancheng area in the north of Jiangsu as an example, it is generally customary to apply only nitrogen fertilizer. Most farmers should apply 15~20 per mu. Kilograms of urea. However, for the wheat fields that have been damaged by the cold current in the early stage, it is impossible to apply a large amount of urea as the wax fertilizer. If a large amount of urea is applied, it will not only have no beneficial effect but adverse effects, which will waste the fertilizer, increase the cost, and may also produce the environment. Negative effects. There are several suggestions for how to manage frozen wheat seedlings:
First, according to local conditions, the local materials for the winter wheat seedlings covered with a layer of "warm quilt", in order to prevent a more cold flow before and after the Spring Festival, the wheat tiller freezing or growth point frozen, especially for the sow like Yancheng too Shallow wheat fields and some winter-weak varieties are likely to cause more serious disasters such as non-greening and non-discrimination in the coming year. There are many materials that can be used as “warm quilts”, such as straw, charcoal, cow and sheep pig manure, poultry manure, garbage manure and grass ash, etc. These materials are laid in the wheat field, which can not only keep warm seedlings but also have certain nutritional effects. .
Second, the application of fertilizer should be based on the application of phosphate fertilizer and potassium fertilizer, avoiding the application of a large amount of chemical nitrogen fertilizer. If nitrogen fertilizer is required, it is best to apply ammonium or ammonium sulfate. Phosphate fertilizer is best to pass calcium phosphate, 20~30 kg per mu. It can also be applied with calcium, magnesium and phosphate fertilizers. If potassium fertilizer is applied as the best, it is warm and can be used for potassium. During this period, the application of phosphate fertilizer can enhance the cold resistance of wheat seedlings and promote hair roots, which is beneficial to the wintering of wheat seedlings.
3. For wheat fields with flat or low-lying areas, if there is a problem of excessive soil moisture in addition to low-temperature freezing damage, attention should be paid to field drainage measures or artificial tillage, such as soil surface moisture. Appropriate or a little dry, the root layer soil is well ventilated, but it is conducive to the development and bottoming of the roots of wheat. The nutritional problem of wheat seedlings has not become a major problem. In the case of weak wheat, many nutrients are not needed. This is what the farmer said, "There is water under the hoe, and there is fat under the hoe."
4. Why is there no recommended nitrogen fertilizer for the wax fertilizer in the wheat field? Especially, it is not recommended to apply urea? The reason is that high-nitrogen compound fertilizer is applied to the base fertilizer in this case, and it is applied to the surface or shallow soil. The environment in which the root system is located is not only lacking nitrogen, but too much available nitrogen will increase the freezing damage. For other wheat fields, if there is no more nitrogen fertilizer applied in the base fertilizer, or the base fertilizer compound fertilizer is applied at a depth of 15 cm, in order to timely supply nitrogen to the wheat seedlings after greening, and promote early spring tillering and conservation, it can be timely applied in the spring of the next spring. Nitrogen fertilizer, the nitrogen fertilizer saved at this time can be applied together. Nitrogen fertilizers should use ammonium bicarbonate or ammonium sulphate or even ammonium chloride (non-salt soil areas), but not urea, because urea is slow to convert in early spring, and the fertilizer efficiency is slower than other ammonium nitrogen fertilizers.
Expert: Senior Consultant of Sinochem Fertilizer Professor of the Agricultural College of China Agricultural University Cao Yiping Farmer Daily

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