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在杂交水稻制种、繁殖时,常常要用叶龄指数和余数,来判断其生长发育进度,以决定父、母本播种错期和调节花期;在指导水稻移栽、施肥、晒田和进行水稻苗情观察时,也常常要用叶龄作为水稻发育时期的依据。因此,叶龄是水稻生长发育的外部标志,是我们实行科学种稻不可不掌握的一项重要指标。
In the hybrid rice breeding and breeding, leaf age index and the remainder are often used to determine the progress of its growth and development to determine the parent and the female sowing the wrong time and regulate flowering; in guiding the rice transplanting, fertilization, drying and carrying out Observation of rice seedling situation, but also often use leaf age as the basis for the development of rice. Therefore, leaf age is an external indicator of rice growth and development, which is an important indicator we must master in implementing scientific rice cultivation.