In the early spring, cold injury (downturned spring) refers to the time when wheat enters the period of returning green jointing. As the cold wave arrives, the surface temperature drops below 0°C and the frost damage occurs. The most effective measure for preventing frost damage in early spring is to pay close attention to weather changes and water before cooling. Therefore, there are watering conditions in the land, watering before the cold wave, to prevent early spring frost damage has a good effect. If cold damage occurs in early spring, it is necessary to apply fertilizer in time to remedy the problem. The main method for alleviating freezing injury is to topically apply nitrogen fertilizer and promote the rapid growth of small tillers. The wheat stems that have been frozen in the main stalks and the Oita are used to recover fertilizer in two separate applications. After the first thawing in the field, topdressing quick-acting nitrogen fertilizer, applying 10 kg of urea per acre, drilling seedlings to open the ditch, in order to improve fertilizer efficiency, lack of water in the wheat fields. Phosphorus can promote the growth of tillers and roots. P deficiency wheat can be mixed with urea and diammonium phosphate. The second time in the jointing stage of wheat combined with water-saving pouring, applying 10 kg of urea per acre. Generally frozen wheat fields (with only frozen leaves, no dead phenomenon) should be plucked early in the early spring to increase the temperature, promote the return of green wheat seedlings, and top-dressing watering, improve the rate of tillering and spike formation. JIANGSU CLS TECHNOLOGY CORP.LTD , https://www.js-cls.com