title: [Study on mathematical model of optimum fertilizer application to Pinellia ternate cultivation].
abstract: OBJECTIVE
  To study the mathematical model of optimum fertilizer application to Pinellia by field experiments.
  
  
  METHODS
  Three factors and 5 levels quadratic rotational combination design was applied to study the effects of N, P and K.
  
  
  CONCLUSIONS
  N, P and K combination application can achieve the maximum yield of 29,921.4 kg x hm(-2), the amount of N, P2O5, K2O were 413.79, 224.79, 164.01 kg x hm(-2), respectively. The effects of the 3 factors were in following orders: P > N > K.
authors.affiliation: College of Agriculture, Gansu Agricultural University, Lanzhou 730070, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Jianwen
authors.initials: J
authors.lastname: Pei
authors.forename: Wanchang
authors.initials: W
authors.lastname: Sun
authors.forename: Shaoping
authors.initials: S
authors.lastname: Yang
authors.forename: Wenjun
authors.initials: W
authors.lastname: Liu
authors.forename: Xinrong
authors.initials: X
authors.lastname: Sun
mesh_terms: D000383:Agriculture / Q000379:methods*; D005308:Fertilizers; D016014:Linear Models; D008954:Models, Biological; D030021:Pinellia / Q000187:drug effects* / Q000254:growth & development*
chemical_list: D005308:Fertilizers