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在甜菜第一年营养生长期间,一般生有50—70片叶.本文着重根据这些叶片对甜菜植株所起功能的不同,将它们分为三组。第一组称苗期叶(子叶和第1—10片真叶),它们对幼苗根系的生长和新生叶的形成起基础作用。第二组称中层叶(第11—35片叶),它们的光合作用产物主要供给块根生长和糖分积累,对块根产量和含糖率的高低起决定作用。第三组叶称内层叶(第36片以上的叶),因为它们发生很迟,对产量形成和糖分积累作用较小。在叶片功能分组的基础上,有针对性的提出各时期相应的栽培技术措施。
During the first year of beet vegetative growth, there are generally 50-70 leaves.This article focuses on the different functions of these leaves on sugarbeet plants, which are grouped into three groups. The first group is called the seedling leaves (cotyledons and 1-10 th true leaves), which play a fundamental role in the growth of the seedling root and the formation of new leaves. The second group, the middle leaf (leaf 11-35), their photosynthetic products mainly supply root growth and sugar accumulation, the root yield and sugar content plays a decisive role. The third group of leaves referred to the inner leaves (leaves above the 36th leaf) because they occurred very late and had little effect on yield formation and sugar accumulation. On the basis of the leaf function grouping, we put forward corresponding cultivation techniques and measures in each period.