1. Kansas Corn: Seed to STEM
Growing Degree Days
Kansas Corn: Seed to STEM

2. Where Do We Grow Corn In The U.S.?

3. Growing Degree Days Equation

4. Example of Growing Degree Day Calculation
On a sunny May day, our high temperature was 70°F, and our low temperature was 54°F, our equation would look like this and we would end up with 12 GDDs from that one day:
GDD ℉= 70 ℉+54 ℉ −50 ℉

5. Growing Degrees Practice: Calculate How Many GDDs We Get Each Day…

6. Growing Degrees Practice: Calculate How Many GDDs We Get Each Day…

7. Growth Stage Chart Based on Accumulated Growing Degree Days

8. Rules To Remember If Calculating Growing Degree Days:
Rule #1: If your minimum or maximum temperature is below 50°F, set it to 50°F in the equation.
Rule #2: If you maximum temperature is above 86°F, set it to 86°F in the equation.

9. On Your Own: Calculate How Many GDDs We Get Each Day….

10. On Your Own: Calculate How Many GDDs We Get Each Day….

11. Now, let’s look at real world data:
Go to:
Your Job:
Back out the map
Click on 3 fields (from different areas)
Use the chart for each field to determine when corn would mature… write it on sheet
Complete reflection questions on back after you are done