Chart of the week: GP variances

I received a question about warm-season growth potential (C4 GP) and whether the GP is really less than 20% when the average air temperature is in the mid-60s °F, or just under 20 °C. I know most PACE Turf members make regular use of GP, so I checked that inquiry immediately, to make sure there was no bug in the calculation. This chart shows what I calculated, with the green line the standard GP from the PACE turf equation, and…