GDD base 50 accumulated since April 1 = 206
http://agebb.missouri.edu/weather/reports/gddTable.asp
Phenology stages according to the Modified E-L system
http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf
Things started moving with a few shoots up to 4 inches long. We fertilized the mature grapes with 75 pounds per acre 46-0-60. The one year old grapes received 1/2 46-0-60 per plant and the two year old grapes received 1 cup per plant.