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小麦各器官的生长发育具有相关性。叶片不仅是小麦进行光合、呼吸、蒸腾作用的重要器官,而且它的生长与分蘖、茎的生长有同伸关系;与穗的发育相对应。同时,叶片对环境条件(特别是肥、水条件)的反应很敏感,而又比较容易鉴别。因此,小麦主茎叶片出现期(叶龄)及其长相、长势,是小麦个体生长发育的综合反映;也是同外界环境条件和栽培技术密切联系着的。有的研究(张锦熙等1975年)根据小麦器官建成的同伸规律与肥水效应等,提出“叶龄指
The growth and development of various organs of wheat are related. Leaf is not only an important organ for photosynthesis, respiration and transpiration of wheat, but also its growth is related to the growth of tillers and stems. At the same time, the response of the leaves to environmental conditions (especially fertilizers and water conditions) is very sensitive and relatively easy to identify. Therefore, the appearance of wheat leaf stem (leaf age) and its appearance, growth, is an integrated reflection of the individual wheat growth and development; but also with the external environmental conditions and cultivation techniques are closely linked. Some studies (Zhang Jinxi et al. 1975) based on the same rules of wheat organs built with fertilizer and water effects, etc., proposed "leaf age refers to