The PACE Turf growth potential equation has one variable (the actual air temperature) and two constants. The constants are optimum air temperature and a term for variance that controls the shape of the curve as the actual temperature moves away from the optimum temperature. It's a little more complicated than that, because the constants change depending on whether you are making the calculation for cool-season grass, warm-season grass, and on whether you are using the Fahrenheit temperature scale or the Celsius temperature scale.

• The blog post discussed is https://www.asianturfgrass.com/post/calculating-gp/
• PACE Turf climate appraisal forms at: https://www.paceturf.org/journal/climate
• More about GP and the variance term at https://www.asianturfgrass.com/post/what-is-variance-in-growth-potential-equation/

• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
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• Turfgrass information and decision-making tools at https://www.paceturf.org/
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• ATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/