Experience of raising seedlings of Platycodon grandiflorum

Since the wild varieties of Platycodon grandiflorum were trained into domestic species, the long bifurcation of roots and plant lodging have become the bottleneck hindering the production and planting. Especially since the 1980s, a large number of demand from South Korea, Japan and other countries, the standard fresh Platycodon grandiflorum is required to be more than 1.2cm in diameter and no fork in length above 15cm, and the price of fresh products is close to that of dry products. Even so, less than 20% of Platycodon grandiflorum per mu meets the above criteria. Therefore, the drug farmers in each producing area can only improve the selection rate of Platycodon grandiflorum commodity by increasing the planting seed density, in order to achieve the best benefit. The seed sowing of Platycodon grandiflorum increased from 2 kg per mu to 4 kg, and some even sowed 8 kg. This leads to plant lodging and low yield. In recent years, with the formation of domestic Platycodon grandiflorum producing area, the increase of area and the improvement of technology, the export standard is higher. The diameter of fresh products is more than 1.5cm and the length is above 20cm. How can we meet the above standards and obtain higher output? Through repeated experiments and careful study, we adopted a series of measures such as raising seedlings in summer, transplanting in winter and cutting seedlings in early summer, which not only increased the rate of commodity selection, but also increased the yield and benefit.

Select the sandy loam with deep soil layer and good drainage and apply sufficient base fertilizer. Conditional optional farm manure, the application of farm manure per mu is not less than 10000 kg. If there is no farm manure, cake fertilizer can be used instead, 300 kg per mu. Compound fertilizer can be applied according to the condition of the land. The land is deeply turned over 30cm, consumption is fine and leveled, and the border is ready for sowing.

The sowing time should be between Grain Rain and the Summer Solstice, and the seed consumption per mu should be 1215kg. Seeds with a germination rate of not less than 80% shall be evenly sowed with fine soil and slightly shaded after sowing, and can be covered with grass or sunshade net. Generally, the seedlings can be completed in 12-18 days. It can produce 40-550000 seedlings per mu in that year.

After transplanting Frosts Descent, it can be transplanted. When raising seedlings, it is easy not to break roots. When transplanting, turn ditch 20cm and select seedlings with strong plants and no bifurcations above 20cm. Pull out the small branches of its seedlings, according to the row spacing of 0.5 feet, oblique planting at 70 °(close to transplanting Welsh onion), generally planting 3.2 ~ 36000 plants per mu.

The management of Platycodon grandiflorum after transplanting is relatively simple, it grows luxuriantly in spring, and it is not easy to grow weeds. Platycodon grandiflorum seedlings are weak and soft and easy to lodge because of their rapid growth. In order to prevent lodging, the seedlings of Platycodon grandiflorum were cut off before and after the Beginning of Summer.

The harvest can be harvested in autumn. Generally, the yield of fresh Platycodon grandiflorum per mu is more than 1500 kg, and the export standard selection rate is more than 80%.