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笔者于1982—1992年对58个水稻品种(包括杂交组合和制种亲本)进行的观察结果表明:水稻外观形态特征——双零叶、葫芦叶、植伤叶和伸长叶枕距是判断水稻叶片叶龄的依据.在秧田期间可用数记法和种谷方向来判断秧苗的叶龄;在水稻移栽后返青分蘖期,可根据第一双零叶、第一类葫芦叶、植伤叶来判断叶龄的变化;在幼穗分化期,可根据第二双零叶、第二类葫芦叶和伸长叶枕距来判断最后3片叶.
The results of observation on 58 rice varieties (including cross combinations and seed-breeding parents) from 1982 to 1992 showed that the morphological characteristics of rice - double zero leaf, cucurbit leaf, Leaf leaf age based on the number of seedlings can be used during the seedling direction and direction to determine the seedling leaf age; translocation in the rice tillering stage, according to the first double zero leaves, the first type of gourd leaves, leaves To determine the change of leaf age; in young panicle differentiation period, the last two leaves can be judged according to the second double zero leaf, the second type cucurbit leaf and the extensor leaf pitch.