平果县从1985年以来,对杂交稻制种技术进行不断摸索改革,使大面积制种产量提高到300多公斤,高产田块超过400公斤.其主要制种技术要点及体会:一是提高田间花粉密度,把母本开花期安排在父本开花期的前一天,大大地提高母本的异交结实率,二是建立强大的母本群体,采用定向栽培的方法使每亩母本有效穗达到24-25万穗以上;三是合理使用植物激素,在父母本始穗达5-10%时每亩使用九二○15克,Ⅱ型九二○增 Pingguo County has been constantly exploring and reforming the technology of hybrid rice seed production since 1985, raising the yield of large-scale seed production to over 300kg and over 400kg of high-yielding plots. The main technical points and experience of seed production are as follows: First, Field pollen density, the female parent flowering period arranged in the male parent flowering period, greatly improve the female parent outcrossing rate, the second is to establish a strong female population, the use of directional cultivation method to make effective per mu of female parent Spikes reached 24-25 million spikes or more; third is the rational use of plant hormones in the parent spike up to 5-10% when the use of 20920 grams per acre, Ⅱ type 920