GDDs April 21, 2021
Erik Smith, Area Field Crop Specialist/Team Leader
Central New York Dairy and Field Crops
What a difference a week makes! Soil temps were holding at or below 50, but those and GDD accumulations should be at a stand-still until Friday. Remember, GDD are calculated by taking the average daily temperature ((high + low)/2), then subtracting the 'base' temperature for the development of a particular crop or pest. During this phase of spring, we're using a base of 32 degrees F to look at grass growth, and 41 F for alfalfa growth. GDD are not especially reliable at predicting forage harvest timing in our area, but they can give you an idea of how the season is progressing. Harvest grass or top your pastures at the flag or boot stage (Feekes 8-9), which might be soon for some of us. There is some nuance for harvesting alfalfa since most of our alfalfa crops are mixed with grass (harvest pure alfalfa at 28", but 50/50 stands when alfalfa is 22"), so stay tuned for our alfalfa 1st cutting monitoring program in the coming weeks.
The entire region has been experiencing a mild water deficit this spring, but this week's precipitation will bring most of us back up toward capacity. See the Climate Smart Farming Water Deficit Calculator for more information.
Below is this week's GDD table with data current as of April 19. So far, our entire region is 25-50% above normal, with some locations double the normal accumulation. See the Climate Smart Farming Growing Degree Day website for more information.
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