The interior of the crop is made up of a large number of cells. The moisture inside the crop, between cells and cells, begins to freeze when the temperature drops below zero degrees Celsius. It is known from physics that when the object freezes, the volume Inflated. Therefore, when the ice particles between the cells increase, the cells will be compressed, the water inside the cells will be forced to penetrate outward, and the cells will lose too much water, and the internal gel will gradually solidify, especially After a frosty period in the cold, when the temperature suddenly rises again, the moisture oozing out of the crop quickly turns into water vapor. The water lost from the cells cannot be recovered and the crop will die. At this time, the growth rate of wheat was accelerated, the organs of the plant developed rapidly, the tissues were relatively soft, and the water content of the cells was relatively high. Therefore, they were particularly sensitive to low temperatures, and were most afraid of the night frost damage.
After jointing, the young wheat seedlings are in the florets differentiation stage. During this period, cold injury occurred. The light causes the wheat to form a variety of spikes, such as half spikes and two spikes. In severe cases, the wheat cells are aborted, resulting in a large number of empty shells in the panicle, and even the entire young panicles are frozen and died.
Rape is an overwintering crop and is vulnerable to varying degrees of low temperature damage. When the rapeseed blossoms, when the temperature falls below 5°C, the flowering of rapeseed will be affected and the flowering will stop; if the temperature drops below 0°C, the buds will be damaged by freezing and the flowers and fruit will fall off in large quantities, and the phenomenon of subsection scarring will occur when the temperature is low with the rainfall. Will increase the hazard.
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