GP finally = 0!! Growth Potential Fertility (GP) is still a relatively new concept in turfgrass management. For the past 2 years I have been using it as the main method to determine rates and timing of fertilizer applications. If you haven't already read this excellent article by Dr. Micah Woods, I highly suggest you do otherwise this post won't make much sense. I currently use GP to fertilize greens, tees, and fairways. My main motivation to use GP fertility is to reduce the incidence of disease and to reduce or eliminate any excess or waste in my operation. That is the main purpose of GP, to only apply as much nutrients as the plant needs at the correct times. I have had quite a few questions how I use GP in practice. Here is a brief overview of how I use GP on each area of my golf course. For Greens I apply simple soluble source nutrients weekly applied through my sprayer. Every Monday I check the forecast and from this I get the average temperature for the following week.