First, antifreeze and seedling protection measures
(I) Increase coverage to ensure safe wintering of weak seedlings
1. Cover the straw. Before winter, in the wheat rows, 250-300kg wheat stubble and crushed wheat straw should be applied per acre, which can protect lotus roots and prevent freezing. After rotting, the soil can be improved and fertility can be cultivated. It is an effective measure for drought resistance, freezing prevention and yield increase in wheat fields.
2. Covered earth fertilizer. After the wheat enters the wintering period, the soil is mixed with fertilizer (called “warm ditch manureâ€) in order to shelter the wind, increase the temperature and prevent freezing, and supplement the nutrients for the green growth of the wheat seedlings. The thickness of manure is preferably 3 to 4 cm.
(B) timely winter irrigation to prevent frost
Timely winter irrigation is an effective measure to prevent winter wheat freezing injury. Winter irrigation can form a good soil moisture environment, adjust the soil nutrients in the cultivated layer, and increase the heat capacity of the soil. Generally, it can increase the ground temperature by 1～3°C, at the same time, it can bridge the earth seam and promote More than one child, grow up, grow strong seedlings. Winter irrigation should be performed at a temperature of 4°C. If the temperature is below 4°C, there is a risk of freezing injury during winter irrigation. Winter irrigation also depends on the soil, seedlings, and lyrics and flexible control, clay should be properly early irrigation, sand land should be late irrigation, rice fields or rice fields at the end of a good wheat can not irrigation.
Second, the remedial measures after frost damage
1. Strengthen fertilizer and water management. If the leaves are frozen and the young ears are not completely frozen, ie, the drought-fat wheat field where the base leaves of the wheat seedlings turn yellow and the tips of the leaves are withered, watering should be done early to prevent the dehydration of young ears. For the main stem young ears have been frozen, timely nitrogen fertilizer should be applied topdressing, applying 10 kg of urea per mu, and combined with water to promote frozen wheat seedlings to restore growth as soon as possible, and promote the long-term delivery, the spike.
2. Protect crops in the arable land and raise the ground temperature. The frozen wheat fields should be timely cultivating loose soil, water storage and heating, can effectively promote the tillering into the ear, make up for the main stem ear loss.
3. Strengthen management in the later period. After wheat suffers from freezing injury, it is necessary to do a good job in the post-middle management of the main wheat seedlings, and strive to minimize the damage caused by freezing.
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