GDUs: Growing degree units which are calculated by {HEAD ~ the Barger Method}, where the heat units for {TAIL ~ a 24 h period} are calculated as GDUs=−50 
GDUs : Growing degree units which are calculated by { HEAD ~ the Barger Method } , where the heat units for { TAIL ~ a 24 h period } are calculated as GDUs=−50
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH