Effects of N, P2O5, and K2O application on the yield and quality of Astragalus membranaceus bunge root
1988
Park, N.K. | Choi, D.U. (Kyongbuk Provincial Rural Development Administration, Taegu (Korea R.)) | Chang, S.M. | Choi, J. (Kyongbuk National Univ., Taegu (Korea R.). Coll. of Agriculture)
This study was conducted to increase the quality of Astragali radix and to decide the application amounts of N, P and K fertilizer for Astragalus membranaceus Bunge. The ferlilizers effect on the ash contents and extracts from the root and the dried root yield was studied. With increaing the application amount of nitrogen more than 5Kg/10a, the acid insoluble ash content of root increased, but the ethyl alcohol and diethyl ether extracts decreased. No effect of phosphorus amount on the ash and extracts conents in root was observed. With increasing amount more than 7Kg/10a, only the acid insoluble ash contents increased. The dried root yield increased with the application level until 5kg/10a of nitrogen, but the effects of phosphorus and potassium application were not observed. Positive correlation was obtained significantly between the ash (r= 0.746* ) and acid insoluble ash (r0.858** ) contents and the potassium application amount, and the negative correlation was also obtained significantly between the extract contents and the nitrogen (r= -0.778*; C2H5OH, r= -0.848**; (C2H5O)2O) and potassium (r= -0.772*; (C2H5O)2O) application amounts. As the results in the first year from the seeding, it is recommended for quality of Astragali radix to apply 5, 7-14, 7kg/10a of N, P2O5 and K2O, respectively
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