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通过“四严”规程的纯化选育，把Ⅱ─３２不育系的不育株率从９５％提高到１００％，不育度从９４％提高到９９．９％，使混杂退化的 Ⅱ─３２Ａ育性达到标准，并取得大面积制种的成功。
Through the purification and selection of the “Four Strict” regulations, the rate of sterile plants in line Ⅱ-32 was increased from 95% to 100% and the sterility increased from 94% to 99.9% 32A fertility reached the standard, and made a success of large-scale seed production.