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我国北方晚熟冬麦区,近廿年来,高产育种工作尚未育成一个大面积稳产千斤的小麦品种。如何突破限制产量的因素,这是育种工作者一直关心和探讨的问题。根据产量三因素——穗、粒、重的分析,亩穗数是较易控制的因子,除品种本身的遗传性之外,完全可靠播量来调节。因此,品种本身成穗率的高低不是主要矛盾。穗粒数因受气候条件的限制,幼穗分化期较短,育成大穗品种较为困难,借助穗整齐度、穗型和小穗着生
In late 20 years of winter wheat region in northern China, high-yielding breeding has not yet bred a large area of wheat varieties with stable yield. How to break the limit of yield factors, which is breeders have been concerned about and explore the issue. According to the three factors of yield - spike, grain and heavy analysis, the number of ears per acre is a more controllable factor, except for the heredity of the species itself, and is completely and reliably sown. Therefore, the rate of varieties of their own spike is not the main contradiction. Spike grain number due to climatic conditions, short spike differentiation, breeding larger ears varieties more difficult, with the ear uniformity, panicle and spike