title: [Primary study on absorption, translocation and accumulation of N, P and K of Achyranthes bidentata].
abstract: OBJECTIVE
  To study the absorption, translocation and accumulation of N, P and K on Achyranthes bidentata.
  
  
  METHODS
  The contents of N, P and K were determined by mean of sulfuric acid-hydrogen peroxide assimilating method, vanadium-ammonium molybdate colorimetric method and flame photometric method, respectively.
  
  
  RESULTS
  The contents of N, P and K in the plant were decreasing during the growth period. The absorption rates of the three nutrients by A. Bidentata showed double-peak curves in the whole growth period, maximum absorption rate appeared in the middle ten days of October. About 8.59 kg of N, 1.36 kg of P and 7.40 kg of K were needed to produce each 100 kg root.
  
  
  CONCLUSIONS
  The key nutrients absorption period is in the first ten days of September and in the middle ten days of October.
authors.affiliation: Henan Agricultural University, Zhengzhou 450002, China.
authors.forename: Xiao-yan
authors.initials: XY
authors.lastname: Zuo
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Shi-yue
authors.initials: SY
authors.lastname: Xue
authors.forename: Yan-lai
authors.initials: YL
authors.lastname: Han
authors.forename: Yan-li
authors.initials: YL
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Zhong-yi
authors.initials: ZY
authors.lastname: Zhang
authors.forename: Jin-fang
authors.initials: JF
authors.lastname: Tan
mesh_terms: D029044:Achyranthes / Q000378:metabolism*; D001692:Biological Transport; D009584:Nitrogen / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*
chemical_list: D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium