The cause of winter freezing injury in wheat
2021-06-06 12:04:08
Freezing injury in winter is caused by the cold injury caused by the cooling of cold during winter and wintering. The degree of cold damage is also constrained by three factors: one is the extreme minimum temperature, the second is the duration of low temperature, and the third is the severity of sudden changes in cold and warmth.
There are four main reasons for the occurrence of winter wheat freezing injury:
1. Variety factors. Winter wheat varieties are divided into winter, semi-winter and spring varieties. After sowing, all varieties need to pass the low temperature for a period of time to complete the vernalization development stage. The second year will be the jointing and heading. The number of days and time required for all varieties to pass the vernalization stage is different. In the production, the winter variety is required to be sowed within the suitable period, and the semi-winter or spring variety should be sown within the appropriate period. The spring variety should be planted at the latest so as to prevent the wintering or spring variety from sowing prematurely. Loss of frost resistance through the vernalization stage.
2. Climate factors. In autumn and winter, the gradual decrease in temperature can make wheat suffer from cold-resistance and enhance cold resistance. If the temperature suddenly rises below 0°C in warmer weather, it will cause freezing damage to the wheat.
3. Sowing factors. Premature sowing will cause spring varieties to pass through the vernalization stage before winter and reduce cold resistance.
4. Scaling factors. Excessive seeding and excessive application of nitrogenous fertilizers caused serious frost damage. In wheat fields with large seeding rates, the wheat seedlings are clustered together, the pods are highly prosperous and long, and the wheat seedlings are slender; at the base of excessive nitrogenous fertilizers, the nitrogen fertilizer promotes the long plant height of the wheat seedlings, and it is prosperous. The wheat flour in wheat fields with prosperous growth has less sugar accumulation and less cold resistance and is prone to frost damage.
There are four main reasons for the occurrence of winter wheat freezing injury:
1. Variety factors. Winter wheat varieties are divided into winter, semi-winter and spring varieties. After sowing, all varieties need to pass the low temperature for a period of time to complete the vernalization development stage. The second year will be the jointing and heading. The number of days and time required for all varieties to pass the vernalization stage is different. In the production, the winter variety is required to be sowed within the suitable period, and the semi-winter or spring variety should be sown within the appropriate period. The spring variety should be planted at the latest so as to prevent the wintering or spring variety from sowing prematurely. Loss of frost resistance through the vernalization stage.
2. Climate factors. In autumn and winter, the gradual decrease in temperature can make wheat suffer from cold-resistance and enhance cold resistance. If the temperature suddenly rises below 0°C in warmer weather, it will cause freezing damage to the wheat.
3. Sowing factors. Premature sowing will cause spring varieties to pass through the vernalization stage before winter and reduce cold resistance.
4. Scaling factors. Excessive seeding and excessive application of nitrogenous fertilizers caused serious frost damage. In wheat fields with large seeding rates, the wheat seedlings are clustered together, the pods are highly prosperous and long, and the wheat seedlings are slender; at the base of excessive nitrogenous fertilizers, the nitrogen fertilizer promotes the long plant height of the wheat seedlings, and it is prosperous. The wheat flour in wheat fields with prosperous growth has less sugar accumulation and less cold resistance and is prone to frost damage.
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