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１９８９～１９９１年的研究表明：青皮３号叶形的转换是在一定叶龄基础上发生的，根据叶龄与叶形结合来划分生长阶段比传统的株高法和生长速度法更为稳定和准确；苗期和旺长初期与纤维细胞的慢速分化期和旺盛分化初期相对应，分别为心叶期（０～８叶龄）和３裂叶期（９～１２叶龄）；旺长盛期包括纤维分化盛期及积累盛期，分别与５裂叶初（１３叶龄）至５０叶龄左右（３０片７裂叶）和５０叶龄左右至９月底。１９９２年的分期收获试验表明，９月底以后，纤维产量及强力均提高很少，收获期只与光、温有关，与叶龄无关。因此，提前播种和早施旺长肥（提高出叶速度）以及延长纤维积累盛期是高产优质的关键。
The results from 1989 to 1991 showed that the conversion of leaf shape of Qingpi No. 3 occurred on the basis of a certain leaf age. The division of growth stages according to leaf age and leaf shape was more stable than that of traditional plant height and growth rate methods Accurately; seedling and Mongolian early and early phase of fibroblasts and differentiation of the rapid differentiation of the initial phase correspond, respectively, the leaf phase (0 ~ 8 leaf age) and 3 leaf stage (9 ~ 12 leaf age) Including the peak period of peak fibrosis and accumulation of peak, respectively, 5 cracked leaf early (13 leaf age) to 50 leaf age (30 7 cracked leaf) and 50 leaf age to the end of September. Staged harvest tests in 1992 showed that after the end of September, fiber yield and strength increased little, the harvest only with light and temperature, has nothing to do with leaf age. Therefore, it is the key to high yield and good quality that early sowing and early sowing of long-fat fertilizer (increasing the leaf-out speed) and prolonging the accumulation of fiber.