If the temperature rises after the temperature rises in the spring, the temperature dropped drastically in the cold air attack, but it is significantly lower than the average over the same period of the year, and even when the temperature drops sharply below 0°C, there is a rain and snow weather. This kind of warm and cold weather is called the “cold winterâ€. Cold freezing injury is one of the major obstacles to the high and stable yield of wheat. The late spring and winter mostly occurred in March and April. At this time, wheat began to reach its jointing stage and its ability to resist cold was reduced. In severe cases, it caused dead seedlings to die, resulting in a substantial reduction in production.
To do the following preventive measures:
1. Pay attention to the medium and long-term weather forecast and take timely measures to prevent the endangerment of late spring.
2. Before the onset of the cold wave, water or smoke, adjust the micro-climate near the ground to prevent freezing damage.
3. Prolong growth of wheat fields in moderate growth. Repression in early spring, spray Zhuang Fengan from the beginning.
After remedial measures after cold damage:
1. After the occurrence of frost damage, topdressing nitrogen fertilizers should be applied in time to promote the rapid growth of small borers. It was found that the main stem and the wheat field in which the Oita had died of freezing were topdressed twice. After the first thawing in the field, topdressing available nitrogen fertilizer, applying 10 kg of urea per acre, and requiring the application of ditching to improve fertilizer efficiency; lack of wheat and wheat fields for water application; phosphorus can promote the role of tillering and root growth, lacking Phosphorus blocks can be mixed with urea and diammonium phosphate. The second time in the jointing stage of wheat, urea was applied in combination with water and 10 kg/mu.
2. Strengthen management in the late period to prevent premature aging. Frozen wheat fields consume more nutrients due to plant body and are prone to premature senescence in the later period. Based on the first topdressing in the spring, the growth and development of wheat seedlings should be reviewed. If necessary, suitable fertilizers can be applied at jointing stage or flag-raising stage to promote panicle granules. More, improve grain weight.
3. Wheat that suffered from cold damage in early spring and low temperature damage should immediately apply available nitrogen fertilizer and watering to reduce the damage caused by freezing.
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