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通过１９９４～１９９５年对扬麦１５８高产群体的培育及其调控技术的研究，明确了扬麦１５８高产的适宜穗数为２８万左右，攻取大穗的关键首先是增加每穗可孕花数，其次是提高可孕花结实率。在适宜穗数范围内提高成穗率，有利于增加高效功能叶面积，降低花后绿叶消亡速度，增加齐穗期单茎茎鞘重和花后干物质积累量，提高粒叶比，增加可孕花数、可孕花结实率、每穗粒数、千粒重，从而提高产量。把成穗率提高到６０％以上，是培育扬麦１５８高产群体的一个重要指标。同时对生产实践中如何提高小麦成穗率进行了探讨
Through the research of cultivating high-yielding population of Yangmai 158 from 1994 to 1995 and its regulation technology, it is clear that the suitable spike number of high-yielding Yangmai 158 is about 280,000. The key to gain big spike is to increase the number of fertile flower per ear, The second is to increase the rate of seed setting. Increasing the percentage of spikelets in the range of appropriate spike numbers is beneficial to increasing the effective leaf area, decreasing the rate of leaf extinction after anthesis, increasing the stem, sheath and sheath dry weight, and post-anthesis dry matter accumulation, increasing the grain-leaf ratio and increasing Pregnancy number, pregnancy rate can be fertilized, grains per spike, 1000 grain weight, thereby increasing production. Increasing the ear rate to more than 60% is an important indicator for cultivating the high-yield population of Yangmai 158. In the meantime, how to increase the percentage of spikelets of wheat in production practice was discussed