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１９８９～１９９０年在大田条件下，对杂交籼稻和常规籼、粳稻等１２个品种的颖花分化形成等穗部性状进行了观察。结果表明，不同品种每穗颖花分化数差异很大，组成上主要为２次分化颖花。１，２次颖花分化数分别主要取决于第１，２次枝梗分化数。不同品种每穗２次枝梗分化数、每个１次枝梗上２次枝梗分化数均主要决定于每穗１次枝梗分化数，故认为在品种间１次枝梗分化数是决定每穗颖花分化数的首要因子。
Under the field conditions from 1989 to 1990, spike traits such as spikelet formation of 12 indica hybrids, conventional indica and japonica cultivars were observed. The results showed that there were significant differences in the numbers of spikelets per spike between different cultivars. The first and second spikelet differentiation numbers mainly depend on the first and second branch number. Differentiation numbers of 2 stems per panicle for different varieties and 2 stems per 1 stem are mainly determined by the number of 1 stems per panicle. Therefore, it is considered that the number of primary stems differentiations among varieties is decided The main factor of spikelet differentiation per spike.