Remedial measures after wheat freezing injury

After the occurrence of wheat freezing injury, corresponding remedial measures should be taken according to the specific situation. First of all, we can restrain the management of the vigorous growth period of wheat, sprinkle appropriate amount of quicklime in Wangmiao field, sterilize the soil and increase the organic fertilizer in the soil. It is necessary to apply nitrogen fertilizer in time after the year, and to apply it as early as possible in early spring to promote the green of wheat seedlings. Then I will pay attention to the later water and fertilizer management.

Because the growing season of wheat seedlings is generally concentrated in spring, that is, in March and April of the following year, if there is freezing damage at this time, it needs to be remedied in time.

Causes of freezing injury of winter wheat

1, sudden cooling

After sowing wheat, the temperature is very high, which lasts until around early winter. Then the temperature drops suddenly, such as snowfall and rainfall. Because wheat has not experienced supercooling exercise after sowing, it is easy to cause freezing injury after direct cooling.

2. Cold wave and long-term cold weather

In this case, the cold weather lasts for a long time directly, and there are not many sunny days with high temperature. Causes the wheat seedlings on the ground to wither and die, causing freezing damage.

3. cold spring

After the New Year, the temperature began to rise gradually. However, when there is a sudden cold current, the cold resistance of wheat will decrease, and a large area of freezing damage will occur, resulting in dead seedlings.

Remedial measures after wheat freezing injury

Suppress Wang Miao

Now is the best time to suppress Wang Miao, so we can sprinkle some quicklime in Wang Miao.

Lime is hygroscopic, and has the functions of disinfection and insect prevention for soil. But it also has a little-known benefit, such as increasing available nitrogen in the soil, increasing the release of organic phosphorus, and spraying foliar fertilizer.

Remedial measures after many years

1, timely topdressing nitrogen fertilizer to promote the rapid growth of small tillers

In the wheat fields where the main stems and big tillers have been frozen to death, the jointing stage of wheat turning green should be combined with watering and applying jointing fertilizer and urea 10- 15 kg/mu.

2. Apply pesticides to turn green

Generally, in frozen wheat fields, only leaves are frozen and withered, and there is no tillering phenomenon. In early spring, early remedial application should be made to promote the green of wheat seedlings, such as spraying potassium dihydrogen phosphate+brassinolide. Topdressing and watering at the rising stage can improve tillering rate.

3. Strengthen the management of fertilizer and water in the middle and late stages to prevent premature aging.

Frozen wheat fields are prone to premature aging in the later stage because plants consume more nutrients.

On the basis of the first topdressing in spring, according to the growth and development of wheat seedlings and the needs of wheat seedlings, an appropriate amount of foliar topdressing should be applied at jointing stage or flag-raising stage.

This can promote large panicle and more grains, increase grain weight, strive to minimize freezing damage and improve wheat yield in that year.

Measures to prevent freezing injury of wheat

The most effective way to prevent wheat freezing injury is to pour frozen water, which can prevent freezing injury well before wintering.

After watering, the ground temperature will rise, which can promote the development of root system and increase the vitality of wheat. Generally, fields with weak growth can be watered early, and plots with strong growth can be watered late. In addition, if the soil moisture is always good, you can choose not to water it.