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扬麦１５８和扬麦５号抽穗到成熟３７ｄ。扬麦１５８抽穗后干物质重增长日数为３４ｄ，扬麦５号为３１ｄ。扬麦１５８灌浆干物质积累前期１３ｄ，平均日增长量０．５６ｇ；中期１２ｄ，平均日增长量２．０６ｇ；后期１２ｄ，平均日增长量０．９８ｇ，呈一条前慢中快后缓的ｌｏｇｉｓｔｉｃ曲线。若与扬麦５号比较，日增长量扬麦１５８比扬麦５号前期高３．６％，中期高７．８５％，后期高１３９％。抽穗期干旱与渍害均影响千粒重。就品种而言，穗期抗逆（干旱、渍害）能力扬麦１５８强于扬麦５号。
Yangmai 158 and Yangmai 5 heading to maturity 37d. Yangmai 158 heading date after the heavy dry matter 34d, Yangmai 5 31d. In the first 12 days, the average daily growth was 0.56g. The average daily increment was 2.06g in the middle 12 days. The average daily growth was 0.98g in the late 12 days, showing a logistic curve. Compared with Yangmai 5, the daily growth of Yangmai 158 was 3.6% higher than the previous period of Yangmai 5, 7.85% in the middle period and 139% in the later period. Drought and waterlogging affect grain weight at heading stage. In terms of varieties, the ability to resist frost (drought, waterlogging) at the ear of Yang Mai 158 is stronger than that of Yang Mai 5.