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田间推断杂交稻制种花期的方法很多,如“抽长叶”、“叶龄余数”、“叶龄指数”等等。虽然各种方法都有一定的准确性,但其准确度并不十分理想,尤其在两系、三系各类长短新组合不断涌现的当今,用常规叶龄指数等法推断幼穗分化进程误差更大、方法更难掌握。日本水稻专家松岛先生等人经过对大量水稻品种幼穗分化研究后,提出“叶龄指数校正值”的概念。他认为主茎16叶的水稻品种其叶龄指数才是标准的叶龄指数,而主茎叶片数低于15叶或高于17叶则需要经过校正后,其叶龄指数值才是准确的叶龄指数,并且校正后的叶龄指数值同幼穗分化进程呈相对应关系。校正式为
There are many ways to infer the flowering of hybrid rice seedling in the field, such as “pumping long leaves ”, “leaf age residue ”, “leaf age index ” and so on. Although all the methods have certain accuracy, their accuracy is not very satisfactory. Especially in the continuous emergence of new combinations of two or three lines, the method of conventional leaf age index is used to infer the error of spike differentiation process Bigger, the method is harder to master. Japanese rice expert Mr. Matsushima and others after a large number of rice panicle differentiation studies, put forward the “leaf age index correction value” concept. He believes that the leaf index of the 16-leaf varieties of the main stem is the standard leaf age index, while the number of the main stem leaves less than 15 leaves or more than 17 leaves need to be corrected, the leaf age index value is accurate Leaf age index, and the corrected leaf age index value correlated with the process of spike differentiation. The formula is