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本试验的目的是明确：（１）株型对各生殖生长阶段长度的影响；（２）各生殖生长阶段长度的遗传力及其与产量和种子质量的相关。试验用２５个生育期不同的品种于１９９２和１９９３年的雨季进行。除Ｒ１－Ｒ２期外，株型不影响其它生殖生长阶段长度。所有生殖生长阶段长度的遗传力都较高（＞０．７４）。鼓粒期（Ｒ２－Ｒ７）长度与种子寿命呈不显著负相关，与种子产量及种子大小呈不显著正相关。总生殖生长期长度可作为选择长鼓粒期品系的初始选择指标。种子寿命与开花前日数间存在显著的正相关。
The purpose of this experiment is to clarify: (1) the effect of plant type on the length of each reproductive growth stage; (2) the heritability of each reproductive growth stage length and its correlation with yield and seed quality. The experiment was conducted in 25 rainy seasons with different growing periods in the rainy seasons of 1992 and 1993. Except for the R1-R2 period, the plant type does not affect the length of other reproductive growth stages. The heritability of all reproductive growth stages was high (> 0.74). There was no significant negative correlation between the length of R2-R7 and seed life, and no significant positive correlation with seed yield and seed size. The length of the total reproductive growth period can be used as the initial selection index for the selection of the long-grain stage. There was a significant positive correlation between seed life and days before flowering.