GDDs June 19,2020
Kevin Ganoe, Area Field Crop Specialist
Central New York Dairy and Field Crops
Each week we will be offering the air Growing Degree Days (GDDs) for corn that have accumulated to date from 13 locations across the team 8 county area. A thank you to our intern Peter Burritt for pulling this information together.
Four planting dates will be listed and included will be:
GDDs Season To Date
15 Year Average GDDs
30 Year "Normal" GDD
Period of Record - Max and min recorded GDDs for that time period
Growing Degree Days for corn are Base 86/50 degree F and calculated by taking the average daily temperature, ((Daily Max Temp - Daily Min Temp)/2) - 50. But the maximum temperature cannot be more than 86 degree F and the minimum less than 50 degree F.
GDDs are close to the 15 year average and 30 year "normal" for the date, with the May 1 planting still lagging some and later planting actually ahead.
V6 stage should be reached at around 475 GDDs and V12 around 815 GDDs. The potential number of kernels per row is developed at the V12 stage so yield can be limited by drought and or nutrient deficiencies at that time.
See the attached tables for more of the the June 19, 2020 results.
See the attached pdf for a good guide on corn development and our reference for growth stages.
GDDs June 19, 2020 (pdf; 435KB)
Visual Guide to Corn Development (pdf; 21544KB)
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