title: [Study on the dynamic growth rhythm of Achyranthes bidentata under different densities].
abstract: OBJECTIVE
  The experiment was conducted to study the dynamic growth rhythm of Achyranthes bidentata under different densities.
  
  
  METHODS
  The plant samples were collected to measure the growth rate of each organ.
  
  
  RESULTS
  Under different densities, the growing dynamic rhythm of A. bidentata were similar. The growth of main root exhibited a trend of "slow-fast-slow" by stages. The increase of dry root weight was fastest during the period of 30-40 days before harvest. The dry-matter increasing rate of whole plant was fastest in the later period of branching stage. The differences of root yields among the plants growing under different densities were significant.
  
  
  CONCLUSIONS
  For high yield and good quality, the density of planting of A. bidentata should be considered.
authors.affiliation: Department of Agronomy, Hebei Normal University of Science and Technology, Changli 066600, China. wangwenpo@126.com
authors.forename: Wen-Po
authors.initials: WP
authors.lastname: Wang
authors.forename: Yan-Sheng
authors.initials: YS
authors.lastname: Li
authors.forename: Yin-Fu
authors.initials: YF
authors.lastname: Zhou
mesh_terms: D029044:Achyranthes / Q000033:anatomy & histology / Q000737:chemistry / Q000254:growth & development*; D018533:Biomass; D004365:Drugs, Chinese Herbal / Q000032:analysis; D009929:Organ Size; D018515:Plant Leaves / Q000033:anatomy & histology / Q000737:chemistry; D018517:Plant Roots / Q000033:anatomy & histology / Q000737:chemistry / Q000254:growth & development*; D018547:Plant Stems / Q000033:anatomy & histology / Q000737:chemistry; D010946:Plants, Medicinal / Q000033:anatomy & histology / Q000737:chemistry / Q000254:growth & development*; D011786:Quality Control
chemical_list: D004365:Drugs, Chinese Herbal