Asian Journal of Plant Sciences1682-39741812-5697Asian Network for Scientific Information10.3923/ajps.2020.214.222Rehmannia glutinosa Libosch. Crops by Application of N, P and K Fertilizers and Plant Spacing]]>Loan PhamThanh NguyenVan Huy HoangThi Le Thu Tien HaThi Tam Nghia PhanChi Duong VuXuan Thu TranThi 32020193Background and Objective:Rehmannia glutinosa Libosch. is a well-known medicinal plant species thanks to its valuable catalpol content with proven pharmacological potentials. However, there was little evidence on improving the crop productivity with a high catalpol content and total root yield. The present study aimed to assess the influence of nitrogen (N), phosphorus (P) and potassium (K) fertilizers on the catalpol content of Rehmannia glutinosa roots sown under divergent plant spacing. Materials and Methods: The experiment was designed with two factors: Factor A includes five incremental levels of fertilizers (0, 60, 120, 180 and 240 kg ha1 for N; 0, 40, 80, 120 and 160 kg ha1 for P and K) and factor B includes three plant spacings of S1 = 15, S2 = 20 and S3 = 30 cm between rows and 20 cm between plants. High Performance Liquid Chromatography (HPLC) was employed to determine the catalpol content. Results: The results showed that a moderate level of N (180 kg ha1) in combination with S3 might produce the highest root yield and catalpol content. Both P and K appeared better than N in catalyzing plants to gain higher yield and accumulate maximum catalpol content at the application rates of 120 kg ha1. Conclusion: The current study confirms the positive influence of N.P.K. and plant spacing on the total yield and catalpol content in roots of Chinese foxglove and practical information to promote the mass production for medicinal materials and pharmaceutical industries.]]>Zhang, R.X., M.X. Li and Z.P. Jia,2008Rehmannia glutinosa: Review of botany, chemistry and pharmacology.]]>117199214Bhattamisra, S.K., K.H. Yap, V. Rao and H. Choudhury,20202020Zhang, Y.L., W.S. Feng, X.K. Zheng, Y.G. Cao, Y.Y. Lv, H. Chen and H.X. Kuang,2013Rehmannia glutinosa.]]>891519Feng, W.S., M. Li, X.K. Zheng, N. Zhang, K. Song, J.C. Wang and H.X. Kuang,2015Rehmannia glutinosa Libosch.]]>295963Li, W., R. Zhang, J. Guo, H. Shao and X. Yang,2016R. glutinosa oligosaccharides against high L-carnitine diet-induced endothelial dysfunction and hepatic injury in mice.]]>85285293Choi, H., H. Jang, T. Chung, S. Jeong and J. Cha, 2013861928Zhang, R., J. Zhou, M. Li, H. Ma, J. Qiu, X. Luo and Z. Jia,2014Rehmannia glutinosa oligosaccharides on the impaired glucose metabolism in chronic stress rats fed with high-fat diet.]]>21607614Zhou, J., G. Xu, J. Yan, K. Li, Z. Bai, W. Cheng and K. Huang,2015Rehmannia glutinosa (Gaertn.) DC. polysaccharide ameliorates hyperglycemia, hyperlipemia and vascular inflammation in streptozotocin-induced diabetic mice.]]>164229238Ibrahim, M.H., H.Z.E. Jaafar, A. Rahmat and Z.A. Rahman, 2011Labisia pumila Blume).]]>1252385254Xiaohong, O., Y. Ye, G. Lanping, Z. Duanwei and L. Dahui,201729629638Zhao, Y.X., X.M. Mao and X.B. Zhou, 20182814411446Bernstein, N., J. Gorelick, R. Zerahia and S. Koch,2019Cannabis sativa L).
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