According to the practice of storing cabbage in the northern cellar, after entering the cellar, the temperature in the cellar changes accordingly with changes in the outside temperature, which changes the respiratory intensity of the cabbage itself. Therefore, the cabbage storage process can be divided into three stages according to these characteristics. The pre-management stage starts from "starting winter" to "big snow". The temperature during this period is relatively high, and the Chinese cabbage is in a vigorous state of respiration, which can easily lead to an increase in the temperature of the cellar. It is necessary to pay attention to ventilation, cooling, overturning, and removing rotten leaves. It is advisable to keep the temperature in the cellar at around 0°C. Using night ventilation to cool down, it is generally necessary to let go from 6 to 7 o'clock in the morning until about 12 o'clock in the middle of the night. The temperature of the cellar is high, and the drop is unpleasant. You can open the skylights to stay up late at night and watch out for strong northerly winds or northwest winds. At the same time to diligently turn cabbage, generally have to fall 3 times. Pour people to wear gloves to reduce the body temperature on the impact of food. When the food is poured, it must be fast and light, not to hurt or not to pick the leaves, so that cooling does not damage the dish. When rotten leaves need to be removed, they can be removed with a bamboo knife without using an iron knife. The leaf that is taken off or taken off must be taken out of the pit to prevent it from affecting the storage of the cabbage in the pit. This phase of the mid-term management begins with the “big snow†and ends with “establishing springâ€. This stage is the coldest stage, the outside temperature is obviously reduced, the temperature in the pit is also reduced, and the coldest damage is most likely to occur. This period is the focus of antifreeze damage. The change of temperature in the pit is relatively stable, and the respiration intensity of cabbage itself is relatively low. It can be adjusted according to the temperature of the pits. Ventilation should not rely on air alone to prevent bad gas from draining and cause aging and rot of Chinese cabbage. Flexible use of skylights and ventilation should be used for ventilation. Exhaust time starts around 10 o'clock in the morning and continues until 5 o'clock in the afternoon. It is based on the principle that the cabbage in the cellar is not frozen. The number of cabbages falling during this stage is less, usually 15 to 30 days down 1, practice and precautions with the previous period. After the later period of this period, the outside temperature gradually rose and the temperature inside the cellar increased accordingly. The cabbage itself respired. In addition to preventing frost damage, it is also important to pay attention to injury prevention and to control the temperature. The use of nighttime and morning and evening winds should prevent the outside world from entering the cellar and sunlight from the skylights and breezes into the cellar. Observe the changes of the dish at any time and pick out rotten leaves. China Agricultural Network Editor
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