In the spring, when the temperature rises, the temperature will drop sharply, which is obviously lower than the average of the same period of the year. Even if the temperature drops to below 0 °C, there will be rain and snow. This kind of warm and cold weather is called “cold springâ€. The freezing cold damage is one of the main obstacle factors affecting the high yield and stable yield of wheat. The cold spring occurred mostly in March and April. At this time, the wheat was rising to the jointing stage, and the cold resistance was reduced. In severe cases, the dead seedlings died, resulting in a substantial reduction in production.
Take the following precautions:
1. Pay attention to the medium and long-term weather forecast and take timely measures to prevent the damage caused by cold spring.
2. Before the cold wave comes, water or smoke, adjust the near-surface microclimate and prevent freezing damage.
3. Moderately inhibit growth in the long wheat field. In the early spring, the town was suppressed, and the body was sprayed with Zhuangfengan.
Remedial measures after freezing cold damage:
1. After the occurrence of freezing damage, the nitrogen fertilizer should be applied in time to promote the rapid growth of small mites. It was found that the main stem and the wheat field where the big tiller had frozen to death had to be topdressed twice. After the first thawing in the field, the quick-acting nitrogen fertilizer was applied, 10 kg of urea per acre was applied, and ditch application was required to improve the fertilizer efficiency; the wheat field was applied to the water; the phosphorus promoted the tillering and root growth, and lacked Phosphorus blocks can be used in combination with urea and diammonium phosphate. For the second time in the jointing stage of wheat, 10 kg/mu of urea was applied in combination with watering.
2. Strengthen management in the middle and late stages to prevent premature aging. In the frozen wheat field, due to the high nutrient consumption of the plant body, premature senescence is prone to occur in the later stage. On the basis of the first top dressing in spring, the growth and development of the wheat seedling should be observed. According to the needs, the appropriate topdressing should be carried out during the jointing stage or the flag-raising period to promote the large grain of the ear. More, increase the weight of the grain.
3. Wheat subjected to early spring freezing damage and low temperature chilling should immediately apply quick-acting nitrogen fertilizer and watering to reduce the damage of freezing damage.
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