Leaf RGR of early and medium ripening varieties was very small or even reached negative in 30 days after FBA while late type reached negative in 50 days after FBA.

• 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。