title: [Study on dynamic change law of N, P and K in Panax notoginseng plant soils with different interval year].
abstract: OBJECTIVE
  To study effects of different interval year on Panax notoginseng plant soils macro element content.
  
  
  METHODS
  The dynamic change of total N, P, K and available N, P, K in soil from Mabai, Matang, Gumu and Panlong was determined under different planting patterns (new soil, interval 5 years soil and continuous cropping soil).
  
  
  RESULTS
  Contents order of soil total N, P and available N, P were interval 5 years soil > continuous cropping soil > new soil. No significant quarter change on soil total N was found, but the other three showed inverted "v" curve, and the peak value appeared on April 2010. Content of soil total K did not change significantly, but the available K content order was new soil > continuous cropping soil > interval 5 years soil, the quarter change was similar as soil available N or P. The soil total N, P, K and available N, P, K were different of the 4 monitoring sites under the 3 interval planting modes. There was a significant correlation between soil total P and available P under all these 3 interval planting modes, but N and K. The propitiation of N-P-K of new soil, interval 5 years soil and continuous cropping soil were 1: 0.4: 2.4, 1: 0.4:1.4, 1:0. 4:2.0, respectively.
  
  
  CONCLUSIONS
  Continuous cropping pattern induce the accumulation of P, but deficient of K. The imbalance proportion of N, P and K was one of the incentives of continuous cropping induced obstacles. Strengthen the research of optimum proportion of soil N, P and K, and then eliminate continuous cropping obstacles by means of formulated fertilization is the future research direction.
authors.forename: Da-Hui
authors.initials: DH
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Xiu-Ming
authors.initials: XM
authors.lastname: Cui
authors.forename: Lan-Ping
authors.initials: LP
authors.lastname: Guo
authors.forename: Hang
authors.initials: H
authors.lastname: Jin
authors.forename: Xin-Yan
authors.initials: XY
authors.lastname: Zhu
authors.forename: Ye
authors.initials: Y
authors.lastname: Yang
mesh_terms: D000383:Agriculture / Q000379:methods; D001947:Breeding; D002681:China; D004365:Drugs, Chinese Herbal / Q000032:analysis; D005308:Fertilizers / Q000032:analysis; D009584:Nitrogen / Q000032:analysis* / Q000378:metabolism; D053723:Panax notoginseng / Q000737:chemistry* / Q000254:growth & development* / Q000378:metabolism; D010758:Phosphorus / Q000032:analysis* / Q000378:metabolism; D011188:Potassium / Q000032:analysis* / Q000378:metabolism; D011786:Quality Control; D012987:Soil / Q000737:chemistry*
chemical_list: D004365:Drugs, Chinese Herbal; D005308:Fertilizers; D012987:Soil; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium