Jackie Guevara did an experiment that compared no P or K fertilizer, those elements as recommended by MLSN, and those elements as recommended by SLAN. The results? MLSN and SLAN were both better than nothing. But MLSN used a lot less fertilizer.
Jackie's thesis at Michigan State University was titled "Effects of Different Soil Testing Philosophies on Creeping Bentgrass and Annual Bluegrass Putting Greens." She looked at how much P and K were applied by different interpretation philosophies, how the grass stood up to traffic, and what happened to the elements that were applied.
I'm chief scientist at the Asian Turfgrass Center and director of the @paceturf information service. Some current projects include #OM246, #ClipVol, and #MLSN.
What is ATC Office Hours?
I discuss technical turfgrass topics with turfgrass managers, scientists, greenkeepers, and whoever drops by the ATC office hours. There's a lot of talk about the work done to create playing surfaces for golf, and also about growing grass for sporting surfaces of all sort, and also some talk of lawns.