title: [A study on inhibitory effect of plant growth retardants on earlier bolting of Chinese Angelica].
abstract: OBJECTIVE
  Seeking chemical ways of controlling the earlier bolting of Chinese Angelica (CA).
  
  
  METHODS
  PP333, B9 and MH in different concentrations and combinations were sprayed into the CA leaves in different periods.
  
  
  RESULTS
  In leaf proliferating period the spray could inkibit the earlier bolting, shortening the length of the stem foot, increasing the stem diameter and enhancing the leaf chlorophy 11 contents. The quality of CA production was increased as a result of greater root weight and main root volume. In leaf luxuriatino period the spray showed no marked effect. The growth of the plant would be inhibited by any spray in excessive concentrations.
  
  
  CONCLUSIONS
  Leaf spray could control the earlier bolting of CA.
authors.affiliation: Gansu Agricultural University, Lanzhou 730070.
authors.forename: E
authors.initials: E
authors.lastname: Zhang
mesh_terms: D029971:Angelica sinensis / Q000254:growth & development* / Q000378:metabolism; D002716:Chlormequat / Q000494:pharmacology; D002734:Chlorophyll / Q000378:metabolism; D008300:Maleic Hydrazide / Q000494:pharmacology; D010937:Plant Growth Regulators / Q000494:pharmacology*; D018515:Plant Leaves / Q000378:metabolism; D010946:Plants, Medicinal / Q000254:growth & development* / Q000378:metabolism
chemical_list: D010937:Plant Growth Regulators; D002734:Chlorophyll; D002716:Chlormequat; D008300:Maleic Hydrazide