小麦最后长出的一片叶子,在植物学上称为旗叶。旗叶的寿命虽然只有40天左右,但对小麦后期的生殖生长,特别是籽粒的形成却是很重要的。据测定,小麦在长到6个叶片以前,积累的光合产物约占小麦一生中积累总量的10—20％,而从7个叶片长到13个叶片,所积累的光合产物,却占小麦一生积累总量的80—90％,其中一半是由旗叶提 The last leaf of wheat to grow is called the flag leaf in botany. Although the lifespan of flag leaves is only about 40 days, it is very important for the reproductive growth of late wheat, especially the grain formation. It has been determined that up to 6 leaves of wheat accumulated more than 10-20% of the total accumulated wheat during photosynthesis, whereas photosynthetic products accumulated in wheat from 7 to 13 leaves 80-90% of the total accumulated life, half of which is flag leaf mention