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