制种田父母本花期预测的方法很多,通常采用的有叶龄余数法、幼穗剥检法。幼穗剥检法最困难的是幼穗分化前期(如幼穗分化一、二期),在形态上不易识别,镜检时又不方便,加之有时切片技术不高也难以正确判断。用叶龄余数法来预测花期的困难是,各个亲本的主茎总叶片数由于受各因子影响,有一定的变化幅度,主茎总叶片数弄不清是难以把叶龄余数计 There are many ways to forecast the flowering date of parents in farming. There are leaf age remainder method and young spike inspection method commonly used. Young spike stripping method is the most difficult pre-spike differentiation (such as spike differentiation stage one and two), not easy to identify in morphology, microscopic examination is not convenient, combined with sometimes not high slice technology is also difficult to judge correctly. The leaf age remainder method to predict the flowering of the difficulties is that each parent main stem of the total number of leaves due to the impact of various factors, there is a certain degree of change, the main stem of the total number of leaves is unclear is the leaf age residual number