在剑叶完全成熟时，从下位叶至剑叶香味逐渐变浓，在同一单株所有叶片中成熟剑叶香味最浓。
When the flag leaf was mature, it had more intensive aroma than all the other leaves of the same plant.
下位叶比上位叶对土壤氮的供应状况更为敏感，随着施氮量的增加，水稻叶片氮素含量、叶绿素含量、SPAD值相应的增加，而下位叶的增幅更明显。
Leaf N/ chlorophyll content and SPAD value increased with the increasing N fertilizer, and the lower leaves were more sensitive to the soil N supply than the upper leaves.
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