Main causes of wheat freeze damage, remedial measures for wheat freeze damage

Freeze damage is an agricultural meteorological disaster.

Crops freeze at low temperatures of 0°C, which is harmful to crops.

Moderate low temperatures are beneficial to the growth of wheat, but extremely cold weather can cause freezing damage to some wheat, affecting its growth and later yield.

So, what are the main causes of frost damage in wheat? What are the remedial measures for wheat freeze damage? Let’s find out together below.

The main reasons for wheat frost damage 1. Poor land preparation quality. Due to the large area of ??wheat straw returned to the field, and the low cost and trouble-free rotary tillage land preparation, some farmers have used rotary tillage land preparation for many years in a row, resulting in extensive land preparation. , The soil is loose, especially when the clay soil is being prepared, there is a lot of rubbish, the soil cracks are large, and the wheat seedlings are very susceptible to freezing.

2. Improper selection of varieties. Varieties have poor cold resistance and are susceptible to freezing damage when the temperature changes suddenly during the winter cold wave or continues to be low temperature.

For example, in 2004, our city planted a large area of ??weak spring varieties such as Yumai 34 and Zhengmai 9023. Due to the high temperature before winter, some wheat fields grew vigorously and even jointed. After the winter solstice, there was a strong cooling , snowfall weather lasts for a long time, resulting in large-scale freezing damage.

According to statistics, the frozen wheat area in the city reached 71,733hm2.

3. Unreasonable sowing amount during the sowing period. Sowing too early will cause the wheat to grow vigorously before winter. Sowing too late and too much will result in single-stem seedlings without tillers and weak seedlings with poor cold resistance. All are poor and extremely susceptible to frost damage.

4. Sowing too deep or too shallow. The sowing depth of wheat is 3 to 4cm. If sowing too deep, the wheat seedlings will be weak after emergence. If sowing too shallow, the tiller joints will be buried less than 3cm in the soil, and the tillering joints will be in a sudden change of temperature and temperature. The environment is extremely prone to freezing damage.

5. Failure to water in time, poor soil moisture, and failure to water in time before the cold snap.

Remedial measures for wheat freeze damage 1. Timely top dressing to increase nutrition.

After the fields with poor fertility are thawed in the field, 5 kilograms of urea + 2 kilograms of diammonium phosphate per mu should be topdressed in furrows.

2. Spraying plant growth regulators on wheat leaves can obviously promote the recovery of wheat growth.

Hoe as early as possible in early spring to increase ground temperature, promote the rejuvenation of wheat seedlings, and increase the tillering and heading rate.

3. During the jointing stage of wheat turning green, apply 10 kilograms of urea per acre in combination with watering the jointing water, and at the same time, spray foliage with 400 grams of potassium dihydrogen phosphate + 0.01% Tianfengsu 10 ml and 30 kilograms per acre. Apply for prevention and control.

After wheat suffers from low-temperature freezing damage, its disease resistance is reduced and it is very easy to be harmed by pests and diseases. Insecticides should be sprayed in time to prevent and control pests and diseases.

4. Strengthen fertilizer and water management in the middle and later stages to prevent premature aging.

In frozen wheat fields, the plants consume more nutrients and are prone to premature aging in the later stages.

On the basis of the second top dressing in spring, according to the growth and development status of wheat seedlings, appropriate amount of foliar top dressing should be applied at the jointing stage or flag raising stage according to the needs of the wheat seedlings to promote larger ears and more grains, increase grain weight, and strive to reduce freezing damage. Losses are reduced to a minimum and wheat yields are increased that year.

5. Hoe as early as possible in early spring to increase ground temperature, promote the rejuvenation of wheat seedlings, and increase the tillering and heading rate.

Pay attention to spraying after 10:00 in the morning and before 15:00 in the afternoon, which has good control and effect. The specific application of pesticides needs to be determined according to the actual wheat situation of each household.

According to the growth level of your own wheat, if it is too vigorous, chemical control should be carried out in time to prevent it from being affected by the late spring cold.