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本文对冀粳８号和９０－３两个粳稻良种叶型和产量因素进行初步分析。结果表明：功能叶的比叶重以倒二叶最大，品种产量水平越高，各叶比叶重越大；抽穗期剪叶对结实率有显著影响，高产品种尤其明显；产量因素的进一步改良应在９０－３产量因素的基础上提高有效穗数。
The paper analyzed the leaf type and yield of two japonica rice varieties JiJing 8 and 90-3. The results showed that the specific leaf weight of the functional leaves was the largest in the second leaf, the higher the yield was, the greater the specific leaf weight was. The longer the leaf cutting stage, the higher the yield was, the higher the yield was. The number of effective spikes should be increased on the basis of 90-3 yield factors.