Is wheat susceptible to cold weather? What management needs to be done?

Wheat varieties are divided into winter varieties, semi-winter varieties, weak spring varieties and spring varieties. There are great differences in cold tolerance among different varieties. Winter varieties have the strongest cold tolerance, and spring varieties have the worst cold tolerance. For land planted too late, generally choose varieties with weak cold tolerance. In cold areas, once encountering ultra-low temperature and cold wave weather, it is also prone to chilling injury.

Due to the large comprehensive utilization area of wheat straw, the cost of cultivated land is relatively low and convenient, and some farmers choose cultivated land for many years, which leads to extensive ploughing and loose soil layer, especially when ploughing cohesive soil resources, the soil layer has a large gap, and wheat seedlings are extremely vulnerable to cold. Sowing in the morning will lead to wheat yellow leaf disease before winter, and sowing too late will produce single-stem seedlings and weak seedlings without heading, which has weak cold tolerance and is extremely vulnerable to cold damage. Before wheat planting, the quality of ploughing is poor, weeds are overgrown in the field, and soil water loss is serious. Long-term drought in wheat leads to less root system, slow seedling growth, thin leaves and stems, and weak ability to resist drought and cold. In that wheat field, once encountering ultra-low temperature and cold wave weather, seedlings are also prone to chilling injury.

What management needs to be done?

For poor quality and large seedlings, soil mixed fertilizer can be applied to cultivate the soil to prevent freezing injury and protect the seedlings. Drink water early. For wheat fields with frozen leaves and unfrozen young ears, water them as early as possible to prevent the young ears from dehydration and death. Topdressing nitrogen fertilizer In the wheat field where young ears have been frozen, quick-acting nitrogen fertilizer should be added, and ammonium nitrate 10- 13 kg or ammonium bicarbonate 20-30 kg per mu should be applied, with water and intertillage to loosen the soil, so that the frozen wheat seedlings can resume growth as soon as possible. Adding phosphate fertilizer can promote tillering and root growth, and urea and diammonium phosphate can be mixed in phosphorus-deficient wheat fields. When freezing injury happens to wheat in winter, spraying 0.3%-0.5% chlormequat chloride solution on wheat seedlings can inhibit plant growth and resist or reduce the occurrence of freezing injury. In addition, spray 800 times of "new high-fat film" emulsion every ten days or so to prevent freezing and restore the physiological vitality of wheat.