The size of mesophyll cells became smaller with leaf position, but the tendency of the changes of the height of mesophyll cells was slightly different between the two varieties.
叶肉细胞随叶位升高逐渐变小，但品种间叶肉细胞高度的变化趋势却有不同。
参考来源 - 期刊学术社区The correlation analysis of plant nitrogen content at different growth stage and the SPAD values of different leaf order indicates that, jointing and booting stage are two critical stages, and the top 3rd leaf could be signal leaf.
不同生育时期小麦植株氮含量与不同叶位SPAD值的相关分析表明，拔节期和孕穗期为小麦氮素诊断的关键时期，顶三叶为指示叶片。
参考来源 - 不同氮肥运筹下专用小麦氮素利用特性及诊断指标的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
季节和叶位以春季中部叶较好。
The middle leaves in spring are better in leaf order and season.
NRA在茎上各叶位中的分布由顶部向基部逐渐减少。
The NRA decreased accordingly from the top to the base of the stem.
不同叶龄或不同叶位稻叶的光合速率与叶绿素含量成正相关。
The photosynthetic rate was positive interrelated with the chlorophyll content in rice leaf during different leaf-age or at different leaf-order.
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