How many days is the growth period of Chinese cabbage?

The growth period of Chinese cabbage is about 55 days.

Zhangjiakou is located in the northwest of Hebei province, east longitude113 50 ′ ~16 30, north latitude 39 34 ′ ~ 4210 ′. It connects Inner Mongolia Autonomous Region to the north, Baoding to the south, Shanxi Province to the west, Chengde and Beijing to the east, and is located between Inner Mongolia Plateau and North China Plain. The general trend of topography in this area is high in the northwest and low in the southeast, and the yinshan mountains passes through the middle, which divides the area into two parts: the upper dam and the lower dam. The dam is divided into valley basins and hilly areas.

2. Bashang area: Kangbao, Guyuan, Zhangbei and shangyi county are located in Bashang area in the north of the city. Bashang area is a part of the Mongolian Plateau, with an altitude of 1400 ~ 1600 meters, with flat terrain and numerous inland lakes, accounting for one third of the total area of the area. The main climatic and agricultural characteristics of this area are: abundant light resources and large temperature difference between day and night. Conducive to the formation of crop carbohydrates and the accumulation of dry matter; Rain and heat are in the same season, and the climate is cool during the growing period, which is suitable for the growth of crops that like cool and cool; High temperature, high humidity and hot weather are few, agricultural products diseases are less polluted, and vegetables in wrong season have high yield and good quality. The annual total solar radiation in this area is about (130 ~ 150) kcal/cm2, and the annual sunshine hours are 3000 hours. May-September is the active growth period of various vegetables and grasses in Bashang area. The average monthly temperatures are May 10 ~ 13℃, June 14 ~ 17℃, July 16 ~ 20℃, and August15 ~/kloc-0. The annual rainfall is 360 ~ 430mm. Suitable for the growth and development of Chinese cabbage, cabbage, celery, carrots, potatoes and other vegetables. The optimum temperature for the growth period of Chinese cabbage is 12 ~ 26℃. If it is higher than 30℃, it will grow poorly and be prone to pests and diseases. The suitable daily average temperature for the whole growth period of Chinese cabbage is 10 ~ 24℃, and the optimum temperature is about 17℃. Temperatures higher than 24℃ and lower than 10℃ are not conducive to the growth and development of Chinese cabbage. The suitable relative humidity is 50 ~ 70%.

3. Proper planting of Chinese cabbage in spring can effectively adjust the supply in early summer and off-season, increase the variety of market colors, and is of great significance to the supply of vegetables throughout the year. But the length of spring varies from place to place, and it is often difficult to accurately predict climate change. The period really suitable for Chinese cabbage growth is short, and the temperature changes from low to high in spring, which meets the needs of reproductive growth of Chinese cabbage, but is not suitable for nutritional growth. Therefore, if the cultivation of Chinese cabbage in spring is not handled properly, it will often bring a series of difficulties and problems.

4. Summer cabbage, also known as early-maturing Chinese cabbage, has strong heat resistance and short growth period, and it only takes about 55 ~ 60 days from sowing to harvesting. Sow in the middle and late July to August, and harvest in the middle of September to 10. Because the growing season of Chinese cabbage in summer is in a hot and dry season, it is necessary to water more to prevent all kinds of pests and diseases. Aphid, jumping headland, tomato diamondback moth, tomato diamondback moth and other pests are more serious. Soft rot is the most harmful disease. If you don't harvest in time, stop watering 5 ~ 7 days before harvesting, and 80% or 90% of the seeds can be harvested and put on the market, otherwise the harm of soft rot will be aggravated.

5. In autumn, according to the growth and development law of Chinese cabbage and the requirements of environmental conditions, Chinese cabbage is sown later, usually after beginning of autumn, so as to avoid the high temperature period in late summer and early autumn, and the growth cycle is longer. Generally, the seedling stage is from beginning of autumn to Bailu, and the wrapping stage is from autumnal equinox to rooting. The winter rosette period is from the Millennium to the autumnal equinox, and the heart-winding period is from the autumnal equinox to the early winter. Generally, vegetables should be harvested in time at the beginning of l 1, that is, when the lowest temperature in beginning of winter drops to about zero. When there is no severe frost climate, measures can be taken to shelve vegetables and promote package, and the date of cutting vegetables can be postponed appropriately.

7. Although it can be planted by stages, Chinese cabbage actually has a suitable growth cycle. Generally speaking, planting period: the average monthly temperature suitable for planting is 15 ~ 18℃, the highest is 2 1 ~ 24℃, and the lowest is 7℃. Germination period: Generally, it germinates quickly and robustly at 20 ~ 25℃, but it germinates quickly at 26 ~ 30℃ but the seedlings are emaciated, and it does not grow well above 30℃. Seedling stage: the suitable temperature is 22 ~ 25℃, and it can also be adapted to 26 ~ 30℃. Rosette period: the average temperature 17 ~ 22℃ is the most suitable, too high leaves grow white and too low leaves grow slow. Nodulation stage: the optimum temperature is 12 ~ 22℃. Enclosure period: it is easy to be frozen below -3℃. Storage: the temperature is 0 ~ 2℃, the relative humidity is 85% ~ 90%, the temperature drops below -2℃, and the Chinese cabbage is frozen.