水稻地下部器官的生长和产量形成,与根系的功能,尤其与中、后期根系功能之间有密切关系。在水稻生育中、后期,根系发育日趋完善,整个根系可分为上层根(最上3个发根节位上的根)和下层根(自上而下第4发根节位以下所有节位的根)两大部分。这些不同层次根系发生的时间不同,着生部位不一,对产量形成的作用也不 The growth and yield formation of underground organs in rice are closely related to the function of the root system, especially the root system in the middle and late stages. In the middle and later stages of rice growth, the development of the root system is more and more perfect. The entire root system can be divided into the upper root (the root of the upper three root nodes) and the lower root (all nodes below the fourth root node) Root) two parts. These different levels of roots occur at different times, with different positions, the role of production is not