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夏播小麦幼穗分化的各个时期与生育时期具有一定的对应关系。其全过程经历的时期为18—19天,比春播小麦缩短8天左右。其幼穗分化是在高温条件下(日平均气温26℃)完成的,是分化过程缩短的主要原因,但其分化期间所需的总积温(450℃)与春播小麦大体接近。其分化期间日平均可见光照时数(14小时)与春播小麦接近,完全可以满足小麦对光照的要求。夏播小麦二棱初期以前各分化期间隔时期与春播小麦相接近,二棱初期以后间隔时期比春播小麦缩短1—3天。其幼穗分化时期虽然比春播小麦缩短了近(1/3),但对穗部发育性状影响不大,而且结实小花数却增加了(每穗平均0.8个),结实率提高到70％左右,其原因可能与夏播生态条件下幼穗分化强度较大有关。
Summer sowing of wheat spike differentiation of each period and reproductive period has a certain correspondence. The whole process of the period of 18-19 days, shorter than spring wheat about 8 days. Differentiation of panicle spikelets was performed at high temperature (average daily temperature 26 ℃), which was the main reason for the shortening of differentiation. However, the total accumulated temperature (450 ℃) during the differentiation period was generally close to that of spring sowing wheat. The average daily number of visible light hours (14 hours) during differentiation was close to that of spring sowing wheat, which could meet the requirement of wheat for light. Summer sowing wheat two edges before the beginning of the differentiation period interval and spring sowing wheat is close to the two edges after the initial period later than the shortened wheat shortened 1-3 days. Although the young spike differentiation period was shortened by nearly one third of that of spring wheat, it had little effect on the development of panicle, but the number of fruiting floret increased (average of 0.8 per panicle) and the seed setting rate increased to about 70% , The reason may be related to summer sowing ecological conditions spike differentiation is relatively large.