1987年,湖南零陵地区农技人员黄培劲及其同事,开展了“杂交稻父本散粉高峰期的发现及应用”一系列研究和大面积示范工作,发现了杂交稻父本开花散粉高峰期和母本柱头外露率高低的敏感期规律,首次将开花高峰期赶粉改为父本散粉高峰期赶粉,并辅之以提高母本柱头外露率,排除授粉障碍的配套技术,提高了杂交稻制种结实率和产量。1992年,他们利用该项技术在全区制种2万亩,亩产达350多公斤,为全区减少制种面积2.6万亩,增加经济效益1400多万 In 1987, Huang Peijin, an agricultural technician in Lingling, Hunan Province, and his colleagues conducted a series of studies and large-scale demonstration projects on “the discovery and application of the hybrid rice paddy-derived loose powder peak period” Female parent stigma exsertion rate of the sensitive period of the law, for the first time will flowering rush to change the fat powder to the male parent loose powder rush peak, supplemented by raising female stigma exsertion rate, excluding pollination barriers supporting technology to improve the hybrid rice Seed production rate and yield. In 1992, they used the technology to plant 20000 acres of the region, yielding more than 350 kilograms for the region to reduce seed production area of ​​26000 acres, an increase of more than 14000000 economic benefits