title: [Studies on accumulation of active ingredients, N, P and K in Anemarrhena asphodeloides].
abstract: OBJECTIVE
  To study the accumulation of active ingredients, the absorption and transformation of N, P and K in Anemarrhena asphodeloides and provide basis for determination of the harvest time and fertilizing.
  
  
  METHODS
  Samples were collected in different phrases and the weight of dry matter, the content of N, P and K of different organs and the content of sarsasapogenin were determined.
  
  
  RESULTS
  Absorption of N, P and K started by the root and rhizoma after July. At the end of August, the N and K of the aerial part transfered largely into rhizome. The content of sarsasapogenin in rhizome was the highest in early spring.
  
  
  CONCLUSIONS
  Additional fertilizer is helpful to increase the yield in July of the second year after the transplantation. The quality is the best when harvest in early spring.
authors.affiliation: Chinese Medicine Herbs Research Center of China Agricultural University, College of Agronomy and Biotechnology, Beijing 100094, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Chen
authors.forename: Chong-jun
authors.initials: CJ
authors.lastname: Yang
authors.forename: Yu-hai
authors.initials: YH
authors.lastname: Guo
mesh_terms: D000042:Absorption; D031403:Anemarrhena / Q000378:metabolism*; D005308:Fertilizers; D009584:Nitrogen / Q000493:pharmacokinetics; D010758:Phosphorus / Q000493:pharmacokinetics; D035261:Plant Components, Aerial / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D010946:Plants, Medicinal / Q000378:metabolism*; D011188:Potassium / Q000493:pharmacokinetics; D027343:Rhizome / Q000378:metabolism; D012621:Seasons; D013150:Spirostans / Q000378:metabolism
chemical_list: D005308:Fertilizers; D013150:Spirostans; D010758:Phosphorus; C046297:sarsasapogenin; D009584:Nitrogen; D011188:Potassium