推广利用杂交粳稻,是获得高产、稳产的技术措施之一。但以黎优57为主的现有组合,垩白(包括腹白、心白、背白)较多。据观察测定,在一般条件下,丰锦、喜峰的垩白率不超过10％,秋光不超过20％,其它多数常规种一般也能控制在30％以下。而当前有代表性的杂交稻组合,在京郊做中稻种植,黎优57和京引66A×300号,一般在60％以上,丰锦A× Promote the use of hybrid japonica rice is one of the technical measures to obtain high yield and stable yield. However, the existing combination of Leyou 57 is mainly chalky white (including belly white, heart white, back white) more. According to the observation and determination, under normal conditions, the chalkiness rate of Fengjin and Xifeng does not exceed 10% and the autumn light does not exceed 20%. The other most conventional species can generally be controlled below 30%. However, the current representative hybrid rice combination is medium-sized rice planting in the suburbs of Beijing, Liyou 57 and Beijing lead 66A × 300, generally above 60%. Fengjin A ×