摘要
甜菜生育期根据叶、根生长及糖分积累特点划分为苗期、叶丛形成期、块根增长期及糖分积累期。甜菜一生可形成50—60余片叶,叶丛形成期发叶最快,每1.4—1.6天生一片叶,第10—30片叶寿命最长达65天—80天左右,对产量贡献最大,称之为功能叶,光合势以块根增长期最高,平均750cm^2/株日,7月下旬以前叶片干物重占总干重的75.42%—77.66%,以后根的干物重占68.44%—72.08%。7月下旬左右,生长中心由叶部转移到根部,9月上旬由根部转入糖分积累,糖分积累前期较快、中期缓慢、后期加快。干物质以蔗糖形式贮存于块根中。
The Stage of Sugarbeet growth is divided into stage of seedling growth, rossette formation,tuber growth and sucrose accumulation based on the characteristics of leaf and root growth as sucrose accumulation.In the life of sugarbeet,50-60 leaves are formed,leaves formation proceeds most rapidly at the rossette stage with one leaf formed in every 1.4-1.6 days. The longevity of the 10th-30th leaves is 65-80 days.The photosynthetic potential is the highest at the tuber growth stage.It is about 750-900cm^2/p.d. Before the later of July,the leaf dry matters is 75.42-77.66% of the total.Then after the later of August,the root dry matters is 68.44- 72.08% of the total.About latter July,the growing center is transfered from leaf to root.In the early of Sept.,the sucrose accumulation is begun in the root with more rapidly in the early and later than the middle period.
