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于１９９４～１９９６年在天水地区观察了不同播种时期对冬小麦幼穗分化进程及主要农艺性状的影响。结果表明：①在适期播种情况下，冬性品种在越冬前进入伸长期，半冬性品种进入单棱期，但二棱期均在返青后出现；②不同播期对半冬性品种幼穗分化的影响主要表现为单棱期持续时间不同；③不同播期小麦的叶片数不同，播期每推迟１０ｄ，大约减少１个叶片；④适期播种情况下，小麦幼穗分化时间早，前期分化速度缓慢，持续时间长，后期分化快，持续时间短
The effects of different sowing dates on spike differentiation and agronomic traits of winter wheat in 1994 ~ 1996 were observed in Tianshui area. The results showed that: ①In winter sowing varieties, the winter varieties entered the elongation stage before winter, and the semi-winter varieties entered the single-edge stage, but both sides appeared after returning to green; ②For the semi-winter varieties (1) the duration of single-ridged stage differed significantly; (3) the number of leaves in different sowing dates was different; the sowing date was reduced by about 10 days for each sowing date; (4) Early differentiation is slow, long duration, late rapid differentiation, short duration