Winter wheat often suffers from freezing injury caused by low temperature and cold weather, and attention should be paid to early recovery.
There are three types of freeze injury in wheat. One is the warm winter cold type. The temperature of winter wheat before and after sowing is high, and the wheat seedlings grow well before winter. After the winter, the temperature drops suddenly or continuous snowfall occurs. Wheat seedlings are frozen because they have not been subjected to cold-resistant exercises. The light leaves of the victims suffer from dryness, and the heavy growth points suffer frostbite. In particular, the growth of Wangmiao in early sowing is more vulnerable. The second is winter cold type. In winter, cold temperatures persist and cold weather occurs many times. If there is little wind or snow, the cold damage will be aggravated, leading to serious wilting or even death. The third is the early winter frost-melting type. Unusually warm spring temperatures, wheat germination point began to sprout, growth, differentiation, cold resistance, at this time encounter cold, freeze-thaw alternation and cold and warm changes caused by freezing injury. The occurrence of frost damage is related to various factors such as weather conditions, cultivation measures, and cold resistance of varieties. For example, the interaction between drought and low temperature during overwintering, improper field management leads to over- or under-strength of wheat seedlings, poor soil preparation, improper watering, and some Variety winter is weak, easy to induce or aggravate freezing injury.
Frozen wheat damage occurs mainly due to the heavy weight of the main stem and the large branch, and minor damage to the small parting crop. The degree of freezing of the wheat seedlings should be carefully observed in the frozen field, and appropriate measures should be taken to remedy the damage. For some wheat seedlings, the main stems and large shoots that have already died, and the small ones that are still alive are not to be destructed. It is advisable to use fast-acting fertilizers as early as possible when returning green and promote the growth and development of small tillers. Generally, urea is applied to urea 7.5 to 10 kilograms per acre. The phosphorus-deficient fields can be combined with appropriate amounts of diammonium phosphate or superphosphate to promote root growth. Fertility can be applied when the fertilizer is good, and it can be fertilized with water when it is absent; 10 kg of urea per acre is applied during the jointing period to promote tillering. For wheat fields with lighter freezing damage and most main stems and large shoots of wheat seedlings, strengthen cultivator and heat preservation in early spring; refer to normal field blocks for fertilizer and water management; return to green fertilizer during water control; carry out fertilizer and water in jointing stage; Apply about 20 kg of urea to promote growth and increase grain weight.
In addition, southern China has more rainwater, and it is necessary to timely excavate the “triple furrows†in unopened wheat fields, and to clear the wheat fields that have been furrowed but are not properly equipped. In winter wheat fields with alternating freeze-thaw cycles and field collapse, it is necessary to timely dig trenches and build rafts so that the ditches can communicate with each other to ensure smooth drainage and prevent or reduce waterlogging.
There are three types of freeze injury in wheat. One is the warm winter cold type. The temperature of winter wheat before and after sowing is high, and the wheat seedlings grow well before winter. After the winter, the temperature drops suddenly or continuous snowfall occurs. Wheat seedlings are frozen because they have not been subjected to cold-resistant exercises. The light leaves of the victims suffer from dryness, and the heavy growth points suffer frostbite. In particular, the growth of Wangmiao in early sowing is more vulnerable. The second is winter cold type. In winter, cold temperatures persist and cold weather occurs many times. If there is little wind or snow, the cold damage will be aggravated, leading to serious wilting or even death. The third is the early winter frost-melting type. Unusually warm spring temperatures, wheat germination point began to sprout, growth, differentiation, cold resistance, at this time encounter cold, freeze-thaw alternation and cold and warm changes caused by freezing injury. The occurrence of frost damage is related to various factors such as weather conditions, cultivation measures, and cold resistance of varieties. For example, the interaction between drought and low temperature during overwintering, improper field management leads to over- or under-strength of wheat seedlings, poor soil preparation, improper watering, and some Variety winter is weak, easy to induce or aggravate freezing injury.
Frozen wheat damage occurs mainly due to the heavy weight of the main stem and the large branch, and minor damage to the small parting crop. The degree of freezing of the wheat seedlings should be carefully observed in the frozen field, and appropriate measures should be taken to remedy the damage. For some wheat seedlings, the main stems and large shoots that have already died, and the small ones that are still alive are not to be destructed. It is advisable to use fast-acting fertilizers as early as possible when returning green and promote the growth and development of small tillers. Generally, urea is applied to urea 7.5 to 10 kilograms per acre. The phosphorus-deficient fields can be combined with appropriate amounts of diammonium phosphate or superphosphate to promote root growth. Fertility can be applied when the fertilizer is good, and it can be fertilized with water when it is absent; 10 kg of urea per acre is applied during the jointing period to promote tillering. For wheat fields with lighter freezing damage and most main stems and large shoots of wheat seedlings, strengthen cultivator and heat preservation in early spring; refer to normal field blocks for fertilizer and water management; return to green fertilizer during water control; carry out fertilizer and water in jointing stage; Apply about 20 kg of urea to promote growth and increase grain weight.
In addition, southern China has more rainwater, and it is necessary to timely excavate the “triple furrows†in unopened wheat fields, and to clear the wheat fields that have been furrowed but are not properly equipped. In winter wheat fields with alternating freeze-thaw cycles and field collapse, it is necessary to timely dig trenches and build rafts so that the ditches can communicate with each other to ensure smooth drainage and prevent or reduce waterlogging.
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