韭菜的植株生长和抽薹开花与叶片净光合速率之间存在着协调的“库—源”关系。韭菜的收割适宜间隔期应不少于25天。韭菜在生长过程中不同叶位的叶片光合能力呈现从幼龄向成熟方向发展的趋势。生产上应选用单株平均净光合速率、叶绿素含量、单株总叶面积和单株平均比叶重均较大的品种。本试验中以津南青韭为最佳。 Chive plant growth and bolting flowering and leaf net photosynthetic rate there is a coordinated “library - source” relationship. Leek harvest appropriate interval should not be less than 25 days. Leek photosynthetic capacity of leaves at different leaf positions in the growth process from the young to the mature direction. Production should use the average net photosynthesis rate per plant, chlorophyll content, total leaf area per plant and the average single leaf weight than the larger varieties. In this experiment, Jinnan green leek is the best.