Cultivation techniques of Chinese Herbal Medicine-Platycodon grandiflorum

Platycodon grandiflorum, alias package flower, bitter root, etc., is a variety of medicine and food. biennial plant.

Growth habits: like warm and humid environment, cold, afraid of water, can winter in the field, the soil requirements are not strict, the general soil can be planted, rich in humus more sandy soil or black soil planting is better, not in the tuyere to prevent lodging.

1. Planting technology: seed propagation, direct seeding and seedling transplanting. The direct seeding method is now introduced: seed propagation, sowing from Qingming to grain rain, planting 1.25~1.5 kg per mu, direct seeding should select the land before sowing, and be sure to apply 2500 kg of manure or 20~30 kg of ammonium phosphate, which is the key to yield increase. After soil preparation, make a furrow, divide a shallow furrow of 2 cm deep according to the row spacing of 20~24 cm, evenly sprinkle the seeds into the furrow, then cover the soil, flatten and water, and keep the soil moist before emergence. In the appropriate temperature of 15 days can emerge: such as soaking early emergence 2~3 days, the method is to put the seeds in warm water at about 50℃, then stir to cool water, then soak for 8 hours, the seeds wrapped in wet cloth, placed in 25~30℃ place with wet hemp on behalf of the seed, washed once a day with warm water, about 4~5 days to wait for the seeds to germinate, you can sow.

2. Field management: pay attention to weeding after emergence, seedling height of 7 cm, plant spacing of 6 cm, platycodon grandiflorum does not like big water, seedling master is not too dry, do not water, small water frequently after seedling setting, and pour frozen water before freezing. To prevent platycodon grandiflorum from branching roots, it must be one seedling per plant, especially in the second year when it is most likely to appear multiple seedlings per plant. At this time, special attention should be paid to removing redundant seedlings, maintaining one seedling per plant, applying more phosphorus fertilizer and less nitrogen fertilizer when fertilizing, so as to prevent light seedlings from not growing roots. Flowers other than seeds should be pinched in time.