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水稻生长发育的进程可以用某一品种或组合不同生育时期的叶龄来表达。本研究利用叶龄余数来鉴定稻穗分化的进程，大量植株解剖实验发现，幼穗开始分化的叶龄余数为４．０左右，这与前人研究为３．０或３．５有所不同，并建立起稻穗分化各期（Ｙ）与叶龄余数（Ｘ）之间的直线回归方程Ｙ＝Ａ＋ＢＸ，其Ｆ测验为极显著。此外还通过调查出叶速度，记载有效积温，经统计分析发现，有效积温与叶龄增长关系相当密切，以此建立了叶龄（Ｙ）与有效积温（Ｘ）之间的回归关系Ｙ＝Ｃ＋ＤｌｇＸ，其相关系数（ｒ）这极显著，从而实现了由有效积温预测叶龄的目的。此二项研究结果为利用叶龄来指导栽培技术措施提供了一套模式化的理论依据和方法，在生产上有一定的参考价值。
The process of rice growth and development can be expressed in a variety or combination of leaf age at different growth stages. In this study, the leaf age was used to identify the process of panicle differentiation. A large number of plant anatomy experiments showed that the young leaves began to differentiate leaf age remnant is about 4.0, which is different from the previous study of 3.0 or 3.5 , And established the linear regression equation Y = A + BX between the stages of panicle differentiation (Y) and leaf age (X), and the F test was extremely significant. In addition, through the investigation of the leaf velocity, recorded effective accumulated temperature, the statistical analysis found that the effective accumulated temperature and leaf age is closely related to the growth of leaf age (Y) and effective accumulated temperature (X) between the regression relationship Y = C + DlgX , The correlation coefficient (r) is very significant, so as to achieve the purpose of predicting leaf age by effective accumulated temperature. The results of these two studies provide a set of theoretical and theoretical basis for the use of leaf age to guide cultivation techniques and measures, and have certain reference value in production.