title: [Effect of gradient magnetic field on growth of stem pearls of Dioscorea opposita during seedling stage].
abstract: OBJECTIVE
  To probe into the bioeffect of gradient magnetic field on the growth and development of medicinal plants.
  
  
  METHODS
  Gradient magnetic field with transmission belt was applied to treat the stem pearis of Dioscorea opposita before sowing and an evaluation of the pearl growth during the seedling stage was made.
  
  
  RESULTS
  Treated with twice gradient magnetic field, the stem pearls grew the best in the seedling stage. Compared with the control, the rate of emergence increased by 38.60%, root number increased by 8%, and the average root length increased by 2.62 cm. By F Test, the average root length was F = 19.98, F0.05 = 6.94 and F0.01 = 18.00.
  
  
  CONCLUSIONS
  Proper magnetic field intensities can promote the growth of medicinal plants.
authors.affiliation: Institute of Medicinal Plant, Chinese Academy of Medical Sciences, Peking Union Medical University, Beijing 100094, China.
authors.forename: A L
authors.initials: AL
authors.lastname: Li
mesh_terms: D027742:Dioscorea / Q000033:anatomy & histology / Q000254:growth & development*; D004574:Electromagnetic Fields; D018517:Plant Roots / Q000033:anatomy & histology; D018547:Plant Stems / Q000254:growth & development*; D010946:Plants, Medicinal / Q000254:growth & development*; D012639:Seeds / Q000254:growth & development