黄土高原甜菜叶片生长特性及其对块根产量、含糖量的影响

通过对旱地甜菜叶片生长特性及摘除不同叶组对块根产量，含糖量，显微结构的影响研究，结果表明：甜菜第10-20片叶的叶龄最长，积温最高，是甜菜的主要功能叶；甜菜从第20片叶期起进入块根，糖份增长期，从第55叶期起进入糖份积累期；摘除不同叶组的叶片对甜菜块根产量，含糖量及显微结构均有不同程度降低作用，摘除前期叶组对甜菜块根产量，产糖量，根径减幅较大，摘除后期叶组对块根含糖量，维管束环数，维管束环密度减幅较大；摘除第1-30片叶对甜菜影响最大。

The growing character of sugar beet leaf and its effect on yield and sugar content in beet root in Loess plateau

Growing character of sugar beet leaf in dry land one influence of cutting different leaf groups on beet root yield,sugar content,microstructure of beet root were studied.The results showed that No.10 to No.30 leaves,charactered with longest growimg period,hight temperature accumulation,were main function leaves.From No.20 leave,sugar beet enter into beet root,sugar inercasing period.From No.55 leaf,it enter into sugar accumulation period.Cutting different leaf groups has different effect on root yield,sugar content and root microstructure.Cutting early leaf group has consider effect on root yield,sugar content and the width of root.Cutting late leaf group considerably decrease the number and density of vascular bundle.Cutting No.1 to No.30 leaves has greatest effects on sugar beet.