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根据甜菜叶、根生长及糖分积累特点,将甜菜个体发育过程划分为苗期、叶丛形成期、块根增长期及糖分积累期等4个生育时期;甜菜一生中形成70余片叶,以叶丛形成期发叶最快,每1.5日生1片叶。11—30片叶寿命长,达75—80天。这20片叶对产量贡献大,称为基本功能叶;光合势以块根增长期最高,600dm~2/株·日以上:7月21日CGRt=CGRr、可将CGRt与CGRr曲线交叉时期,作为叶、根生长中心转移依据:块根增长期以前,干物质分配以叶部为主,占总干物重60%以上,其后根部占优势,至9月末达61.2%,生育中期糖分积累缓慢,后期积累快;7月20日左右,甜菜生长中心由叶部转至根部,8月末由根部转入糖分积累。
According to the characteristics of sugar beet leaf, root growth and sugar accumulation, the individual development process of sugar beet was divided into four stages of growth period: seedling stage, leaf-thickening period, tuberous growth stage and sugar accumulation period; more than 70 leaves were formed in beet Plexus leaves the fastest, the formation of a leaf every 1.5 days. 11-30 leaves long life, up to 75-80 days. The 20 leaves contributed a lot to the yield, which was called the basic functional leaf. The photosynthetic potential showed the highest root growth period, 600dm ~ 2 / plant · day: CGRt = CGRr on July 21, which crossed the CGRt and CGRr curves. Leaf and root growth center Transfer basis: Before the tuberous growth period, the dry matter distribution was dominated by the leaves, accounting for more than 60% of the total dry matter. The roots then dominated and reached 61.2% by the end of September, with a slow accumulation of sugars in the mid- Accumulation fast; July 20 or so, beet growth center from the leaf to the root, by the end of August transferred from the roots of sugar accumulation.