title: [Study on dynamic change of middle and micro element in Panax notoginseng plant soils with different interval year].
abstract: OBJECTIVE
  To study effects of different interval year on Panax notoginseng plant soils middle and micro element content.
  
  
  METHODS
  The dynamic change of Ca, Mg, Mn, Cu, Zn, B from Mabai, Matang, Gumu and Panlong were determined under different planting patterns (new soil, interval 5 years soil and continuous cropping soil).
  
  
  RESULTS
  All the micro elements (except Ca, Mg) of interval 5 years soil and continuous cropping soil were significantly higher than those of new soil. All the middle and micro elements (except B) of interval 5 years soil were significantly higher than those of the continuous cropping soil. Planting patterns had remarkable influence on the content of Mn, Cu, B, but not Zn Ca, Mg. Cu, Ca under the 3 planting patterns, and Zn under the continuous cropping pattern did not show significant quarter changes. B content increased with the elongation of implantation time. Zn in new soil and interval 5 years also increased with prolonging of planted time. Mg, Mn and Cu content reached to peak value on April next year, and reached to minimum on the end of this experiment. Compared with new soil, the proportion of Mn, Cu in total elements increased by 29%, 114%, Mg, B decreased by 18%, 38%, Zn and Ca changed slightly of interval 5 years soils; In continuous cropping soil, Mn, Cu and B increased by 50%, 120%, 22%, respectively, but Zn, Ca, Mg had no significant change.
  
  
  CONCLUSIONS
  Continuous cropping pattern could not induce the deficient of soil middle and micro elements, and thereafter might not result in continuous cropping obstacles. But the imbalance proportional of soil middle and micro elements in P. notoginseng plant soils may be one of the main reasons for continuous cropping obstacles.
authors.forename: Ye
authors.initials: Y
authors.lastname: Yang
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Lan-Ping
authors.initials: LP
authors.lastname: Guo
authors.forename: Xiu-Ming
authors.initials: XM
authors.lastname: Cui
authors.forename: Hang
authors.initials: H
authors.lastname: Jin
authors.forename: Xin-Yan
authors.initials: XY
authors.lastname: Zhu
authors.forename: Da-Hui
authors.initials: DH
authors.lastname: Liu
mesh_terms: D002681:China; D007700:Kinetics; D053723:Panax notoginseng / Q000254:growth & development*; D012987:Soil / Q000737:chemistry*; D013997:Time Factors; D014131:Trace Elements / Q000737:chemistry*
chemical_list: D012987:Soil; D014131:Trace Elements