title: [Research of seed quality grading of Glycyrrhiza uralensis].
abstract: OBJECTIVE
  To formulate the seed quality grading standard of Glycyrrhiza uralensis.
  
  
  METHODS
  Thousand-grain weight, seed moisture, germination rate, purity of G. uralensis seed samples from 24 regions were tested. Through statistical analysis, the key indicator and the reference indicators for seed quality grading were defined.
  
  
  RESULTS
  Germination percentage was the primary indicator of seed quality grading, thousand-grain weight, cleanliness and moisture content were important reference indicators.
  
  
  CONCLUSIONS
  The seed quality of each grade should reach the following requirements: for first grade seeds, germination percentage > or = 85% , purity > or = 92%, thousand-grain weight > or = 13 g, seed moisture < or = 11%; for second grade seeds, germination percentage 75%-85%, purity 83%-92%, thousand-grain weight 11-13 g, seed moisture < or = 11%; for third grade seeds, germination percentage 65%-75%, purity 74%-83%, thousand-grain weight 9-11 g, seed moisture < or = 11%.
authors: Deparment of Seed Science, College of China Agriculture and Biotechnology, China Agricultural University, Beijing 100094, China.
authors: Qun
authors: Q
authors: Sun
authors: Li-Gang
authors: LG
authors: Yang
authors: Zi-Mian
authors: ZM
authors: Ding
authors: Jian-Hua
authors: JH
authors: Wang
authors: Bao-Qi
authors: BQ
authors: Sun
mesh_terms: D018525:Germination; D029882:Glycyrrhiza uralensis / Q000737:chemistry* / Q000145:classification* / Q000502:physiology; D011786:Quality Control; D012639:Seeds / Q000737:chemistry* / Q000145:classification* / Q000502:physiology