Grape phenology and GDD accumulation

We usually begin grape phenology on April 1st, but since development is a bit early this year, we began earlier.

GDD base 50 accumulation count begins April 1 in this resource. We will calculate the March data by hand and add it to our April 1 count  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

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