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应用植物生长分析技术对春大豆早、中、迟熟类型的研究表明，生育期的差异主要在初花后的生殖生长期。在现蕾至现蕾后１０天内，株高和叶面积指数（ＬＡＩ）增加最快。早、中和迟熟品种的ＬＡＩ分别在现蕾后２０和３０天达到最大，比叶面积（ＳＬＡ）和叶重比（ＬＷＲ）随着生育进程而逐渐下降，ＳＬＡ处理间无多大变化，而ＬＷＲ早熟春大豆下降快，至生育后期已降至较低。早、中熟春大豆叶片的相对生长速度（ＲＧＲ）至现蕾后３０天即为较小或为负值，而迟熟类型则在现蕾后５０天才出现负值。产量以中、迟熟类型显著较高。
Studies on the types of early, middle and late ripening of spring soybean using plant growth analysis showed that the difference of growth period was mainly in the reproductive growth period after initial flowering. Within 10 days from budding to emergence, the plant height and leaf area index (LAI) increased the fastest. The LAI of early, middle and late maturity varieties reached the maximum at 20 and 30 days after budding respectively. The specific leaf area (SLA) and leaf weight ratio (LWR) decreased gradually with the growth process, and there was not much change in SLA treatment, LWR precocious spring soybeans decreased rapidly, to the late growth stage has dropped to low. The relative growth rate (RGR) of early and mid-maturing soybean leaves was smaller or negative 30 days after budding, while the late maturity type appeared negative 50 days after budding. Yield in the late maturity type was significantly higher.