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研究了早稻茎数消长和叶龄增长，以及叶面积增长和抽穗率的变化，分析了叶龄与积温、氮肥水平及茎数之间的关系，以及不同类型品种间分蘖力的差异，分别组建了叶龄与积温、茎数的数学模型，不同施氮量与茎数消长的数学模型，以及叶面积增长和始穗率数学模型。结果表明，早稻常规品种的茎数消长主要与叶龄增长的关系密切，同时受品种的分蘖力潜能、总叶片数以及不同施氮量的影响，叶龄增长主要与积温有关，而与施氮量关系不明显。
The growth and decline of stems, leaf area and heading rate of early rice were studied. The relationship between leaf age and accumulated temperature, nitrogen fertilizer and stalks, and the differences of tillering ability between different types of cultivars were analyzed. The mathematical model of leaf age, accumulated temperature and number of stalks, the mathematical model of different nitrogen rates and the number of stalks, and the mathematical model of leaf area growth and initial spike rate were established. The results showed that the growth of stems of conventional rice varieties was closely related to the growth of leaf age, and at the same time, the tillering potential, the total number of leaves and the amount of nitrogen application had different effects on leaf age, The relationship is not obvious.