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水稻的主茎叶片数,在正常的气候和栽培管理条件下作为品种特性是相对稳定的。在生育某一时期主茎已长出的叶片数,称为当时该植株的叶龄。杂交水稻制种时,通常把两亲本叶龄差作为调节花期相遇措施的依据。1983年我区开始进行杂交稻秀优57制种时,就是按照沈阳水稻生长季节的气温和宁夏引黄灌区基本相同的情况作根据的。据沈
The number of main stem leaves of rice is relatively stable as a variety trait under normal climatic and cultivation management conditions. The number of leaves that the main stem has grown at a given period of growth is called the leaf age of the plant at that time. Hybrid rice seed production, usually the difference in leaf age of the parents as the basis for measures to meet the flowering period. In 1983, the district began to carry out the hybrid rice Xianyou 57 seed production, that is, according to the Shenyang rice growing season temperature and Ningxia Yellow River Irrigation Area based on the same situation. According to Shen