Bentgrass grows more—or at least it produces more clippings for a while—when temperatures are higher than optimum for net photosynthesis. This means that you’ll typically see more clippings when the temperature is above the optimum for cool-season grass, even though the growth potential (GP) goes down at those high temperatures.
I watched the Greenkeeper App meeting about organic matter, and I recommend you do too. The video has Doug Soldat, Bill Kreuser, and Roch Gaussoin talking about soil organic matter, rootzones, sand topdressing, and turf performance.
I’ve sometimes explained the temperature-based turfgrass growth potential (GP) of PACE Turf in relation to the grass conditions at the Masters Tournament.
The playing conditions at the Masters are superb, and the cool-season grass in that season is growing at near optimum temperatures.
I put the series of genki level (GL) blog posts together into this 17 page pamphlet.
The pamphlet explains how one can calculate the genki level from the actual N supplied as fertilizer compared to a standard amount of N for any time duration.
In this series of posts, I’ve showed how one can start with temperatures and go all the way to a standardized comparison of growth in response to nitrogen supply. In this one, I want to emphasize which of these are real, which aren’t real but are useful, and to make an argument that this is a lot easier than it might seem.
The amount of nitrogen (N) supplied over a certain time duration, compared to a standard amount, is what I call the genki level (GL). And the amount of clippings harvested over a certain time duration, compared to a standard amount, is what Jason Haines calls the turfgrass speedo.
I showed in part 1 how one can go from temperature to a temperature-based growth potential to a standard N amount.
By looking at the actual N applied, and comparing that amount to the standard N for any location, one gets what I call the genki level.