title: [Study on good agricultural practice for Tulipa edulis--planting density and sowing depth tests].
abstract: OBJECTIVE
  To study optimum planting density and sowing depth of Tulipa edulis.
  
  
  METHODS
  The effects of different planting densities, sowing depth and thin plastic film cover were studied on yield, rate of increase, bulb weight increased multiples, and proliferation rate of bulb.
  
  
  CONCLUSIONS
  Under 30-200 bulbs per squremeter density range, the yield increased with the density increasing, and reached significance level. In 5-20 centimeter depth range, the yield and the number of harvested bulbs enhanced along with the sowing depth increasing, and the best sowing depth was 20 cm. Thin plastic film cover showed no effect on the growth.
authors.affiliation: Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100094, China.
authors.forename: Qi-Zhong
authors.initials: QZ
authors.lastname: Bing
authors.forename: Ben-Gang
authors.initials: BG
authors.lastname: Zhang
authors.forename: Zhao
authors.initials: Z
authors.lastname: Zhang
authors.forename: Zi-Hong
authors.initials: ZH
authors.lastname: Chen
mesh_terms: D000383:Agriculture / Q000379:methods*; D018556:Crops, Agricultural / Q000254:growth & development; D031447:Tulipa / Q000254:growth & development*