soybean floral growth stage, maturity, yield
Weather in recent years has caused many growers to delay seeding or to replant following a killing frost. As a result, growers in late summer ask whether their soybeans at a given growth stage will mature before the first killing frost.
Hall, Robert, "Relationship of Soybean Floral Growth Stage to Maturity and Yield" (1995). SDSU Extension Extra Archives. 315.