水稻一生的叶片按其生理功能可以分为两组:一组用于长叶、发根的营养生长,另一组用于幼穗发育、结实灌浆的生殖生长。后者叶片数在各类品种以及各种环境中都较稳定,为三片半叶左右。营养生长叶片数除了受种性影响外,还受光温等环境条件影响,变幅稍大。本人根据田间实践,认为营养生长叶由于对环境反应不同,还可进一步分为两种:一种是必需营养叶,为完成茎端生长点质变必需的叶片,叶片数基本稳定,受环境影响小;另一种是可消营养叶,由于当时以光温因素为主的环 According to their physiological functions, the leaves of rice can be divided into two groups according to their physiological functions: one is for vegetative growth of long leaves and hairy roots, and the other is for reproductive growth of panicle development and strong filling. The latter number of leaves in a variety of species and a variety of environments are more stable, about three and a half leaves. In addition to vegetative growth of the number of leaves affected by the species, but also affected by environmental conditions such as light temperature, slightly larger amplitude. According to the field practice, I think that vegetative growth leaves can be further divided into two types because of their different responses to the environment: one is an essential nutrient leaf, and the number of leaves necessary for accomplishing the growth of the stem end is basically stable and affected by the environment ; The other is to eliminate nutritious leaves, due to the light and temperature-based ring