杂交早稻亲本系生育特性的观测研究

对 7个早籼恢复系和 7个不育系分期播种的观测表明 ,在合肥地区 4月 6～ 16日播种 ,一般 6月下旬～ 7月初始穗 ;播期每推迟 5d ,播始历期缩短 2～ 4d ,主茎叶片数呈略减趋势或变化不大 ,穗粒性状无明显规律性变化。根据本地气候特点和各亲本系播始历期的长短 ,提出其春播复制的播期只宜安排在 4月 5～ 2 0日 ,抽穗扬花期在 6月 3 0日前后 ;父、母本行比 2∶10～12 ,每穴栽双株

Studies on the Growth Characteristics of Parents of Early Hybrid Rice

The experiments were carried out to observe the character of seven restorer lines and seven CMS lines and the results were as follows: in Hefei region, seeding date was usually from April 6th to 16th;the initial heading, from the last ten days of June to the first ten days of July;and if seeding date was five days late,there was a reducing tendency or no obvious change in the main stem leaves.Based on the climatic conditions in Hefei region,it was proposed that the seeding date in the Spring should be arranged from April 5th to 20th;the heading date and flowering date,in about June 30th;the line rate of male to female parents should be 2 to 10-12 and there were two plants in each hill.