Objective

2

To study the changes of dry matter accumulation， mineral element absorption and medicinal component accumulation in

Belamcanda chinensis

and to provide a theoretical basis for fertilization in the standardized cultivation of

B. chinensis

.

Method

2

During the two-year growth period of

B. chinensis

， the samples were collected at 30-day intervals from day 90 after sowing for the measurement of dry matter accumulation and mineral element content in different organs as well as the flavonoid content in the rhizome.

Result

2

According to the accumulation of dry matter in different organs， the two-year growth period of

B. chinensis

was divided into seven stages： seedling stage （before July in the first year）， first-year vegetative growth stage （August to October in the first year）， first-year late growth stage （November to January of the second year）， re-growth stage （February to March in the second year）， second-year vegetative growth stage （April to May in the second year）， reproductive growth stage （June to October in the second year）， second-year late growth stage （November of the second year to January of the third year）. During the whole growth period， the late growth stage of each year witnessed the expansion of the rhizome， and the accumulation of dry matter of the whole plant peaked after the reproductive growth stage. The content of flavonoids in the rhizome varied greatly among different stages. Specifically， the content of mangiferin， tectorigenin and irigenin was higher in the second-year vegetative growth stage， and that of tectoridin and iridin was higher in the first-year late growth stage and the second-year late growth stage. The content of irisflorentin was higher in the second-year vegetative growth stage and the second-year late growth stage than that in other stages. The total content of six flavonoids peaked in the second-year vegetative growth stage （April in the second year）. The correlation analysis showed that all the nine mineral elements had different degrees of positive correlations with tectorigenin， irigenin and irisflorentin.

Conclusion

2

In the first year，

B. chinensis

presents slow dry matter accumulation and low demand for fertilizer， so the application of base fertilizer can be reduced. In the second year， especially after the reproductive growth，

B. chinensis

demands high fertilizer， so nitrogen， phosphorus and potassium fertilizers and other micronutrients should be applied as early as possible. In addition， the rhizome expands in October to November of the first year and November to December of the second year， when the supply of nitrogen and potassium to the rhizome should be ensured or beneficial elements should be supplemented to improve the quality of

B. chinensis

.