corn hybrid maturity, maturity rating, growing degree day (gdd), relative maturity (rm)
In recent years, delayed seeding and replanting following killing spring frosts have caused many corn growers to consider whether they are using the right maturity rating system to select the proper hybrid maturity for their area. The most common methods for rating corn hybrid maturity include: • The “relative maturity” (RM) rating system • The “growing degree day” or “heat unit” system (GDD)
Hall, Robert, "Using the Relative Maturity Rating System for Selecting Corn Hybrid Maturity" (1995). SDSU Extension Extra Archives. 313.