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杂交水稻幼穗分化开始时叶龄余数值到底是３．０还是３．５或４．０？笔者认为，不管是常规水稻还是杂交水稻，绝大多数品种或组合幼穗分化开始时其叶龄余数值应是３．０，不是３．５，更不是４．０。
When the spikelet differentiation of hybrid rice begins, what is the residual leaf age value is 3.0 or 3.5 or 4.0? In my opinion, the remnant of leaf age should be 3.0, not 3.5 or even 4.0 when most of the cultivars or combinations panicle differentiation begin no matter conventional rice or hybrid rice.