杂交水稻分蘖力强,但分蘖并不能全部成穗,更不能都成大穗。探讨分蘖成穗率,单穗着粒、穗重等与积温的关系,可找出穗大,成穗率高、空秕少的积温指标,以便采用相应措施,夺取杂交水稻的高产稳产。本试验用“矮优2号”1981—1982年田间试验和大田调查的数据,结合它的经济性状与气温资料进行统计分析。 Hybrid rice tillering ability, but the tiller can not all become spike, but can not all become big spike. To explore the relationship between tillering rate, panicle weight, panicle weight, and accumulated temperature, we can find the accumulated temperature index of panicle size, panicle rate and empty space, so as to obtain the high and stable yield of hybrid rice with corresponding measures. In this experiment, the data of field experiment and field survey of “Youyou No.2” from 1981 to 1982 were used to carry out statistical analysis with its economic characters and temperature data.