叶龄---植物发育过程中的不同阶段。一般来说，植物长出几片完全叶就称几叶龄。
The authors stated clearly rice leaf age model, rice high-yielding population quality index, general approach to form high-yielding and good quality rice population and quantitative standards for diagnose by stage.
详述了水稻叶龄模式、水稻高产群体质量指标、水稻高产优质群体培育的总途径和分阶段的诊断的定量指标。
参考来源 - 水稻高产精确定量栽培The main results are as follows:1. Effect of leaf-age of transplant on the heading dateThe heading date of rice was different of as sowed the same day but transplanted different leaf-age.
试验的结果如下:1.相同的播期,不同的叶龄移栽,水稻的播抽期产生一定程度的变化不同叶龄移栽,水稻的播抽期(播种至抽穗的时间)可分为播抽期稳定期、播抽期延长期和播抽期缩短期。
参考来源 - 水稻感营养性的初步研究The inclusions also changed with the leaf's age variation. The crystal cluster and amyloplasts changed from less to more, and the crystalline material changed from noth i ng to someth i ng.
内含物随叶龄变化亦有所不同，晶簇和淀粉粒由少到多，晶体状物质从无到有，这些都可能是促使银杏叶片对疫霉菌侵染的抗性由弱到强的因素。
参考来源 - 银杏疫病的发生及银杏对疫霉菌抗性的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
该基因的转录水平随着叶龄增加而逐渐增强。
这充分表明叶龄追肥对高原玉米增库促源具有良好的效果。
The facts fully show that leaf-age top application increases storage-capacity, source of plateau corn efficiently.
相关分析表明，叶龄与叶片干鲜比值之间呈不显著正相关。
The leaf age was not significantly positive correlation with leaf ratio of dry to fresh weight.
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