title: [Study on balanced application of NPK fertilizer on growth of Paeonia lactiflora with orthogonal design].
abstract: OBJECTIVE
  To study the level of NPK balanced fertilization on growth of Paeonia lactiflora in different growing periods.
  
  
  METHODS
  This experiment was designed as orthogonal test of three factors and three levels. Fresh weight of root, number of bud, number of root division, length of the longest root and diameter of widest root were used as indicators.
  
  
  RESULTS
  Nitrogenous, phoshate and potash fertilizer affected the growth of the Paeonia lactiflora from the first to the third year. And the nitrogenous was the main factor during the fourth year.
  
  
  CONCLUSIONS
  NPK fertilizer, especially N and P fertilizer are needed during the first year of the Paeonia lactiflora. Only the nitrogenous fertilizer is needed in the fourth year.
authors.affiliation: College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China. chenxuan@njau.edu.cn
authors.forename: Xuan
authors.initials: X
authors.lastname: Chen
authors.forename: Kang-Cai
authors.initials: KC
authors.lastname: Wang
authors.forename: Mei-Li
authors.initials: ML
authors.lastname: Wu
authors.forename: Yue-Yu
authors.initials: YY
authors.lastname: Hang
authors.forename: Yi-Feng
authors.initials: YF
authors.lastname: Zhou
mesh_terms: D018533:Biomass; D005308:Fertilizers; D009584:Nitrogen; D029596:Paeonia / Q000254:growth & development*; D010758:Phosphorus; D018517:Plant Roots / Q000254:growth & development; D010946:Plants, Medicinal / Q000254:growth & development*; D011188:Potassium; D013997:Time Factors
chemical_list: D005308:Fertilizers; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium