糜子幼穗分化经历六个时期:0、茎叶原基分化期,Ⅰ、第一苞原期,Ⅱ、枝梗系统分化期,Ⅲ、小穗、小花原基分化期,Ⅳ、雌雄蕊原基分化期,Ⅴ、花粉粒分化形成期。其中,我们重点对Ⅴ期作了观察。糜子幼穗分化的进程因品种熟性与播期差别很大。多元相关分析表明:分化进程在0～Ⅳ各期受日平均温度与品种熟性影响,在Ⅴ期受日平均温度与出现≥30℃高温日数影响。花序顶部小穗比基部小穗提早分化一个时期,分化速度也要快一些。内部穗分化与植株外部形态的关系表现为:Ⅰ～Ⅴ期的叶龄、出现叶及Ⅰ～Ⅳ期的叶龄余数与植株主茎总叶数成线性关系。伸长节在各期也因主茎总叶数而异。不论植株总叶数多少,Ⅴ期,最后一叶出现,叶龄余数相近(1.5);开花期叶片全部展开,穗颈节伸长。叶龄指数贯彻穗分化始终,不受植株总叶数影响,是推断穗分化进程较准确的指标。 Millet spike differentiation experienced six periods: 0, stem-leaf primordium differentiation, Ⅰ, primordium, Ⅱ, stem-branch system differentiation, Ⅲ, spikelet, primordium differentiation, Ⅳ, pistil and stamen primordium differentiation Period, Ⅴ, pollen grains formation period. Among them, we focus on the Ⅴ period was observed. Millet spike differentiation process due to the variety of maturity and sowing vary greatly. Multivariate correlation analysis showed that the differentiation process was affected by the daily average temperature and variety maturity in 0 ~ Ⅳ periods, and the daily average temperature in Ⅴ period and the days of high temperature ≥30 ℃ occurred. Spikelets on top of inflorescence differentiate earlier than basal spikelets for a period of differentiation faster. The relationship between internal ear differentiation and plant external morphology was as follows: the leaf age in stage Ⅰ ~ Ⅴ, the leaf age and the leaf age rests in stages Ⅰ ~ Ⅳ were linear with the total leaf number of main stem. Elongation in each period also varies depending on the total number of main stem leaves. Regardless of the total number of leaves of plants, the Ⅴ phase, the last leaf appears, the leaf age remainder is similar (1.5); all the blooming leaf stage, panicle neck elongation. Leaf age index to carry out ear differentiation always, not affected by the total number of leaves of the plant, is to infer the process of ear differentiation more accurate indicators.