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对杂交中粳８０优１２１在８个不同播期下的生育期、产量因素、理论产量与影响产量因素总积温、光照时数的相关研究。结果表明８０优１２１为中感温、中感光组合；随播期的推迟其全生育期缩短，播期每推迟１０ｄ，全生育期缩短５～７ｄ，播始历期缩短４～６ｄ；构成８０优１２１产量因素的单株有效穗、每穗总粒数与影响该因素的生育时段总积温相关极显著，相关系数分别为０．８４１和０．７０４，结实率不仅与影响该因素的生育时段总积温相关，而且与影响该因素的生育时段光照时数相关，相关系数分别为０．８０３和０．７７１，均达显著水平。千粒重与总积温、光照相关不显著。合肥地区适宜播期为５月上中旬。
RELATIONSHIP BETWEEN GROWTH TERMINATION, YIELD FACTORS, THEORETICAL YIELD AND THE INFLUENCING THE TOTAL ACCUMULATION, LIGHT TIME AND WHOLE COEFFICIENT OF THE YIELD OF ZHONGJI 80 YOU 121 IN 8 STREAMS. The results showed that 80You 121 was medium temperature sensitive and medium sensitive. The whole growth period shortened with the sowing date delayed, the sowing period shortened 10 ~ 7d, the whole growth period shortened 5 ~ 7d, and the sowing duration shortened 4 ~ 6d. The correlation between the effective panicle per panicle, total panicles per panicle and the total accumulated temperature during the growth period was0.841and0.704, respectively. The seed setting rate was not only related to the growth period Total accumulated temperature, but also correlated with the number of hours of photoperiod in the reproductive period, the correlation coefficients were 0.803 and 0.771 respectively, reaching significant levels. Thousand grain weight and total accumulated temperature, light is not significant. Hefei suitable for sowing on the middle of May.