Can Chinese cabbage be directly built in a greenhouse without being pulled out in the field?

Chinese cabbage is not pulled out in the field, and there are many disadvantages in building a greenhouse directly. Now that the light snow has passed, the Chinese cabbage planted in the north has been harvested long ago. What should be sold is sold, what should be saved is preserved, and sauerkraut can be eaten. Chinese cabbage was planted late in southern China, and now it has passed the core-covering period. If the cabbage in the field is ripe (completely wrapped), it will basically stop growing at low temperature. However, Chinese cabbage still needs a small amount of nutrients and water to survive. If the outside temperature reaches below 0℃ for a certain period of time, then Chinese cabbage, as a green leafy vegetable, contains a lot of water, and it is easy to freeze Chinese cabbage at this time. Frozen Chinese cabbage, as soon as it clears up, fades like boiling water after thawing, and soon rots.

In order to prevent Chinese cabbage from freezing injury in the field and not to store it at home after harvest, we use the method of building a greenhouse to protect Chinese cabbage or store Chinese cabbage, which farmers generally do not do, even if Chinese cabbage is stored in a greenhouse after harvest. Although the greenhouse has the function of heat preservation and moisture retention, it is really not suitable for storing Chinese cabbage. First, the cost of greenhouses is high, and it costs 10,000 to 20,000 yuan to build a simple greenhouse, let alone a steel greenhouse. As we all know, Chinese cabbage has high yield and low price. Second, even if Chinese cabbage can be put in a greenhouse, it is quite difficult to manage. After the greenhouse is sealed, the temperature and humidity in the greenhouse will increase, and Chinese cabbage cannot be preserved in high temperature and high humidity environment. If the greenhouse is artificially ventilated and dehumidified, the process is quite complicated. Therefore, it is not worth the loss to preserve Chinese cabbage in greenhouse.

Storage method of Chinese cabbage Usually, people in rural areas grow Chinese cabbage. After the Chinese cabbage is wrapped, most of it is harvested, transported home and stored in the cellar or in a cool and ventilated place. In some areas, the temperature is rarely lower than 0℃ in winter. In such a place, Chinese cabbage can grow in the ground without harvesting. Even if there is occasional cold weather, only a few leaves outside the Chinese cabbage are frozen and the inside is still intact. But when the temperature warms up in spring, you must harvest it, otherwise the cabbage will bolt and blossom.

To sum up, Chinese cabbage has not been pulled out in the field, so it is not recommended to build a greenhouse for wintering. Covering greenhouses is not only expensive, but also difficult to manage. It is suggested that it is safest to cellar or refrigerate Chinese cabbage after harvest.