以 3个杂交中稻品种为材料 ,研究了杂交中稻收割前再生芽死亡机理及其调节。结果表明 :( 1 )头季稻收割前再生芽死亡率高 ,死亡主要集中于倒 4、倒 5节位芽 ;再生芽长度与死亡率呈极显著负相关 ,死亡芽中 95%的长度≤ 3.5cm。 ( 2 )杂交中稻收割前再生芽死亡率高的机理是头季稻抽穗后光合物质主要是供穗部籽粒灌浆结实 ,分配给再生芽生长利用的光合物质极少 ;环境因素对再生芽生长的促进作用 ,必须在一定量的光合物质供给的基础上才能显现。 ( 3)促芽肥施用时期距头季稻齐穗期天数与再生力呈极显著负相关关系 ,但其效果与母茎营养状况有关 ,当母茎营养状况过好或极差时 ,促芽肥施用时期对再生力的影响较小 Taking 3 hybrid mid-rice varieties as materials, the mechanism and regulation of regenerative bud death of hybrid medium rice before harvest were studied. The results showed that: (1) The mortality of rehmannia buds before harvest in the first crop was high, the death mainly concentrated in the down 4 and down 5 buds. The length of the regenerated buds was significantly and negatively correlated with the mortality rate. 95% of the dead buds ≤ 3.5cm. (2) The mechanism of high shoot death rate of hybrid mid-rice before reaping is that the photosynthetic substances in the first season after heading are mainly for grain filling and sprouting in spike parts and few photosynthetic substances for the growth and utilization of regenerated shoots. Promote the role, must be in a certain amount of photosynthetic material supply based on the show. (3) There was a significant negative correlation between the number of days of promoting budding application and the number of days of head growing season heading rice and regenerating vigor, but the effect was related to the nutritional status of stems. When the nutritional status of parent stems was too good or poor, Fertilizer application period less impact on the regenerative force