The temperature of bud formation of Chinese cabbage is 8- 15℃. In high altitude areas, please carefully select the sowing date on the basis of successful trial planting, and then promote cultivation in a large area. It is strictly forbidden to sow before August 20th and after September 20th, otherwise it will be easy to bolt and form a stick shape without sprouting. When the temperature is too high, buds cannot be formed, and bolting and flowering are easy.
Generally, the seedling age of children's vegetables is about 25 days, and it is planted in 10. The row spacing of reference plants is 45-50 cm, and about 2000 plants are planted per mu. Pay attention to light before heavy fertilization, pay attention not to hurt roots when weeding, and shallow tillage.
Extended data:
The suitable germination temperature of Ercai is 20-28℃, and the choice of sowing date is very important. It is appropriate to choose the low altitude area in Chongqing at the end of August and the beginning of September (the high altitude area should be advanced appropriately).
Before sow, that decomposed clear wat manure is poured to moisten the surface of the soil compartment, and the seeds are disinfected: the seed are fully soaked in clear water, soaked in 10% trisodium phosphate solution for 30-40 minutes, fished out, and then washed with clear water to accelerate germination.
When sowing, plant ash or fine wet sand can be mixed to ensure uniform sowing and improve the emergence rate. After sowing, cover the fine sand with a thickness of 0.5cm and then cover it with straw or sunshade net.