近些年来推广的杂交水稻空秕粒率高的主要原因是因为杂交水稻本身存在的生理弱点所造成的,主要有以下几点:1.后期光合效率偏低,导致库大源亏,空秕率较高.根据1976年湖南农学院研究表明.杂交水稻除分蘖期外,幼穗分化期、孕穗期和乳熟期的光合效率均低于常规稻。前期光合优势导致分化大穗,而后期光合劣势引起灌浆物质不足。形成库大源亏现象,致使空秕粒 In recent years, the main reason for the high rate of poplar rice hybrid rice promotion is due to the physiological weakness of hybrid rice itself caused by the following: 1. Late photosynthetic efficiency is low, According to the research of Hunan Agricultural College in 1976, except for the tillering stage, the photosynthetic efficiency of panicle stage, booting stage and milky stage of hybrid rice was lower than that of conventional rice. The preponderance of photosynthesis led to the differentiation of large ears, while the later photosynthesis caused insufficient filling material. The formation of a large source of deficit library phenomenon, resulting in empty tablets