title: [Effect of different fertilizing levels on yields and efficiency components of Pinellia ternata from Sichuan].
abstract: OBJECTIVE
  The effect of the different fertilizing levels on yields and main active components of Pinellia ternata from Sichuan was studied under the cultivated condition, in order to provide theoretical basis for the standardized cultivation.
  
  
  METHODS
  Using one of the wild populations of P. ternate from Sichuan as tested material, the experiment was performed with orthogonal designing methods L25 (5(3)). During growth and development period, agronomic traits such as number of sprouting, inflorescence and bulblets were counted. After harvesting, main chemical compositions, growth and proliferation rates were determined.
  
  
  RESULTS
  In different fertilizing levels, the P. ternata from Sichuan showed the same growth rhythm, though there were significant difference (P < 0.05) among the average emergence rate,whereas extremely significant difference (P < 0.01) were detected among the average ratio of bolting, the average bulbils, individual growth rate, individual proliferation rate, beta-sitosterol and alkaloid content under different fertilizing levels. Nitrogenous fertilizer that affected the content of alkaloids and beta-sitosterol were extremely significant (P < 0.01), whereas phosphate and potassium fertilizer had no significant effect. The effect of fertilizer factor and inter effects on beta-sitosterol showed no significant effect, but have influence on other indexes.
  
  
  CONCLUSIONS
  The optimum fertilizer composition was 315 kg x hm(-2) of nitrogen, 225 kg x hm(-2) of P2O5 and 270 kg x hm(-2) of K2O.
authors.affiliation: Agronomy College, Sichuan Agricultural University, Ya'an 625014, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Shen
authors.forename: Wei
authors.initials: W
authors.lastname: Wu
authors.forename: Kai
authors.initials: K
authors.lastname: Hou
authors.forename: Hongmei
authors.initials: H
authors.lastname: Pan
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Lingliang
authors.initials: L
authors.lastname: Guan
mesh_terms: D000470:Alkaloids / Q000032:analysis*; D005308:Fertilizers; D017672:Nitrogen Compounds / Q000032:analysis; D010710:Phosphates / Q000032:analysis; D017553:Phosphorus Compounds / Q000032:analysis; D030021:Pinellia / Q000737:chemistry* / Q000254:growth & development*; D017680:Potassium Compounds / Q000032:analysis; D012855:Sitosterols / Q000032:analysis*
chemical_list: D000470:Alkaloids; D005308:Fertilizers; D017672:Nitrogen Compounds; D010710:Phosphates; D017553:Phosphorus Compounds; D017680:Potassium Compounds; D012855:Sitosterols; C012500:phosphorus pentoxide; C025473:gamma-sitosterol