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为便于生产中应用,观察了春小麦幼穗发育进程和外部形态间的关系。结果是:河西春小麦在三叶期左右开始幼穗分化。目前生产中应用的品种,在叶龄为5.5左右时,进入小花分化期,节间伸长达1厘米以上,头水必须在这以前浇完。四分子期正是外形上的孕穗期,旗叶和倒二叶间的叶耳距为2—3厘米。适时浇水可有效地防止小穗、小花退化,增加穗粒数。灌浆速度测定说明,在河西春小麦灌浆的主要时期,千粒重每天平均增加1.7克左右。灌浆的适宜温度为20℃左右。连续出现25℃以上的高温天气,会使灌浆减慢或停止。
In order to facilitate the application in production, the relationship between the development of young wheat and the external morphology was observed. The result is: Hexi spring wheat began spike differentiation in about three-leaf stage. Currently used in the production of varieties, when the leaf age of 5.5 or so, enter the floret differentiation, internality elongation of 1 cm or more, the head must be poured before this end. Four molecules is the shape of the booting stage, the flag leaf and the distance between the leaves of the second leaf 2-3 cm. Timely watering can effectively prevent the spikelets, floret degradation, increased grains per spike. Filling speed measurement shows that in the main period of Hexi spring wheat grouting, grain weight per day increased by an average of about 1.7 grams. The appropriate temperature of grouting is about 20 ℃. Continuous emergence of hot weather above 25 ℃, the filling will slow down or stop.