Effects of N, P and K application rates on the yield and the available constituents contents in the rhizoma of Rehmannia glutinosa
1989
Park, B.Y. | Chang, S.M. | Choi, J. (Kyungbuk National Univ., Taegu (Korea R.). Coll. of Agriuclture)
The purpose of this study was centered on investigation of the effects N, P and K application rates on root yield and their available content (catalpol, sugar, ash and extracts) of Jiwhang (Rehmannia glutinosa Liv. var. purpurea Makino), and the current application rates (N 20Kg/10a, P2O5 30Kg/10a, K2O 20Kg/10a) was studied for Jiwhang production in Eui-sung gun southeastern part of Korea Peninsular. The yields of fresh and dried rhizomas were 941-1,494Kg/10a and 251-385Kg/10a, respectively. The rhizoma yield increased highly with increasing the application amount of nitrogen more than 10Kg/10a, but the effects of phosphorus and potassium were observed only at the application level of 40Kg/10a and 20Kg/10a, respectively. Catalpol contents in rhizoma increased at the plot of 20Kg/10a application of nitrogen, but the effects phosphorus and potassium on the catalpol contents were not observed. Catalpol content in dried root increased with increasing N application more than 10Kg/10a. Fructose contents increased at the plot of 20Kg/10a and more N application, and galactose contents decreased with K application. With increasing N application, ash contents decreased, but ethanol extract contents increased
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