提高不育系的异交结实率是杂交小麦种子生产技术研究的关键。在不同时期对K型 (粘果山羊草细胞质 )小麦不育系K76 6 4A用不同浓度九二○ (赤霉酸钾盐 )喷施处理。结果表明 :孕穗末期叶面喷施 45g/hm2 九二○ ,能提高不育系的柱头生活力 ,延长柱头授粉能力持续时间 ,从而使不育系的异交结实率增加 ,喷施时期太迟或剂量太大会产生负效应 Increasing the outcrossing rate of sterile lines is the key to the research of hybrid wheat seed production technology. K-type male sterile line K76 6 4A was sprayed with K 2 O 4 (gibberellic acid potassium salt) at different times. The results showed that spraying 45g / hm2 9202 at the end of booting stage could improve the stigma viability of male sterile lines and prolong the duration of stigma pollination, thus increasing the outcrossing rate of sterile lines and the spraying period too late Or too much dose will have a negative effect