Days to beginning maturity from emergence for the MGR (maturity group reference) soybeans in Heihe, China.

Soybeans with brackets are maturity group reference soybeans from North America. The others are from China. Letters E and L (in brackets) indicate that the soybean is relatively early- or late-maturing, respectively, in the corresponding maturity group; R4, R5 and R6, the growth stages of soybeans failing to mature at first frost.