Propagation method of Guangdong Chinese flowering cabbage Planting method of Guangdong Chinese flowering cabbage

1. Suitable planting varieties: green cabbage varieties should be selected, and early, middle or late maturing varieties should be selected according to market requirements and sowing date. For example, Jiu Si cabbage, an early-maturing variety, is particularly green in 60 days, and it is early-maturing in the middle.

2. Sowing date: The optimum temperature for Chinese flowering cabbage germination and seedling growth is 25 ~ 30℃; The optimum temperature for leaf growth and flower stem formation is 15 ~ 20℃. Autumn planting time is from early August to early September.

3. Direct seeding: Chinese flowering cabbage has short growth period, shallow root system, poor absorption capacity and sufficient base fertilizer. Apply decomposed organic fertilizer 1500 ~ 2000 kg per mu. 1.5m, the row spacing of early-maturing varieties 13cm× 16cm, and the row spacing of middle-late-maturing varieties/20 cm× 25 cm, with the border as the main body, and adopting drilling. The amount of seeds used per mu is 0.3 ~ 0.5 kg. In the 3 ~ 4 leaf stage, the seedlings should be thinned and fixed according to the row spacing between plants.

4. Strengthen field management: 1 Apply 200 ~ 300 kg of dilute manure or 3 ~ 4 ~ 5 kg of urea per mu in the leaf stage, and 400 ~ 500 kg of dilute manure or 4 ~ 5 kg of urea in the third leaf stage. After that, every 5 ~ 7 days, 10 ~ 15 kg compound fertilizer was added with water for topdressing. When budding, apply human manure 1000 kg or compound fertilizer 15 ~ 20 kg per mu. If the side branches are to be harvested, topdressing 1 time after the main branches are harvested to promote the development of the side branches.

5, pest control: the main disease of Chinese cabbage is downy mildew. 600 times solution of 75% chlorothalonil wettable powder; 64% antivirus alum or 58% metalaxyl, mancozeb wettable powder 800 times solution for prevention and control.

Pests are mainly Pieris rapae and aphids. Use yellow board to trap and kill aphids, and use 1000 ~ 1500 times solution to control imidacloprid and acetamiprid. Abamectin, fenvalerate and deltamethrin against Pieris rapae.

6. Timely harvesting: generally, early-maturing varieties mainly adopt main shoots, and middle-late-maturing varieties can adopt lateral shoots. "Bifurcation period" is the suitable harvest period and should be harvested in time. If harvested in advance, the yield will be affected; Delaying the harvest will affect the quality. For middle and late-maturing varieties, 2 ~ 3 nodes are left at the base at harvest to promote the formation of lateral stems.