Scientifically respond to the dead wheat seedlings overwintering

In recent years, the phenomenon of overwintering and dead wheat seedlings has increased year by year, affecting the increase in wheat yield. Based on years of experience, the author has summarized six reasons for the death of wheat seedlings in the winter. Farmers can take effective measures as soon as possible to reduce losses according to the reasons for the death of wheat seedlings in the winter.

Causes of dead wheat seedlings overwintering

1. Low temperature freeze damage. In winter, the temperature rises and falls sharply, the weather is hot and cold, and the temperature changes greatly, and quickly and frequently, which causes the wheat seedlings to freeze too fast and thaw too fast. In this alternation of freezing and thawing, the wheat seedlings are too late to adapt, resulting in reduced physiological functions, leading to the death of the wheat seedlings.

2. Cold damage. In winter, the climate is cold, the frozen soil layer is very thick, the soil moisture is frozen, the root system cannot absorb water from the soil, or the water absorption capacity is very weak, the stems and leaves of the wheat seedlings still lose water by transpiration, causing the water supply and demand in the wheat plant to lose balance, resulting in the gradual dehydration of the wheat. .

3. Dense seedlings. Sowing too early, the wheat field with a large amount of sown, the wheat seedlings will be crowded after the tillering before winter, the population is too large, the field ventilation is poor, the individual growth is weak, and the accumulated organic nutrients are small, which cannot meet the needs of wheat overwintering, resulting in dead seedlings. Weak winter varieties with poor frost resistance are more serious.

4. Return straw to the field. In wheat fields where straw is returned to the field, the soil is loose and cold air is easy to enter, which is easy to cause the occurrence of wheat freezing damage.

5. The soil is dry. Insufficient soil moisture, wheat plants cannot get sufficient water supply during the winter, especially in the years when the climate is changeable, windy, and cold currents, wheat seedlings die due to drought and water shortage.

6. Winter irrigation is too late. Winter irrigation is too late, first, the water content in the wheat body is high, and the cold current will easily cause the plant to freeze and die; second, the frozen soil layer is cracked, the root system is pulled off, and cold air enters the lower part of the soil and the seedlings die; The lower layer of the soil freezes. After watering, the water cannot infiltrate, and the ground freezes. As time goes by, the soil lacks oxygen and the wheat suffocates to death.

Remedy for dead wheat seedlings overwintering

1. Remove dead leaves and increase photosynthesis. Dry leaves in the wheat field with dead seedlings cover the ground, and the remaining green leaves are also covered by dry leaves, which affects the photosynthesis of wheat. When the temperature rises in spring and the topsoil melts, the dead leaves of the wheat ridge should be hugged with a rake to promote the growth of heart leaves.

2. Transplanting and replenishing seedlings, sparse and densely replenish. For the dead seedlings caused by the lack of seedlings and broken ridges, transplanting can be carried out immediately after the wheat turns green. For wheat seedlings whose tillering nodes are white or green and still recoverable, transplanting and replenishing seedlings are not necessary, and management should be strengthened.

3. Topdressing nitrogen fertilizer to promote the rejuvenation of seedlings. After the wheat turns green, apply 25-40 kg ammonium bicarbonate or 10-15 kg quick-acting nitrogen fertilizer of urea as soon as possible to promote the rejuvenation of wheat seedlings as soon as possible.

4. Adjust measures to local conditions and water in time. For transplanting wheat fields with supplementary seedlings, water should be timely after supplementing seedlings. If there is no replenishment of seedlings, do not need to water too early, and should be flexible according to the ground temperature and soil moisture. Generally speaking, water should be watered when the ground temperature of 5cm after turning green is stable and passing 5℃. The amount of water should not be too large, and light water should be used for watering. The moisture content is better and the watering time can be delayed appropriately.

5. Foliar fertilization to supplement nutrition. After the wheat suffers from freezing damage, it is necessary to spray humic acid foliar fertilizer one or two times to supplement the nutrition of the wheat body and promote the recovery of the growth of the wheat as soon as possible.

6. Cultivation and hoeing, increase temperature and protect moisture. After the topsoil of the wheat field is frozen, plough and hoe early to loosen the soil, increase the temperature and protect the moisture, promote the early growth and early initiation of wheat seedlings, increase tillers, and increase the rate of ear formation.

Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for handling. phone

Liquid Injection

Tetanus Shot,varicella vaccine, Live,Hepatitis B Injection,Hep B Vaccine

FOSHAN PHARMA CO., LTD. , https://www.fospharma.com