Classic leaf nutrient ranges vs. PACE nutrient normals

We have been sharing some updated leaf nutrient normal ranges based on leaf nutrient analyses from golf course putting greens. The reason for these updates is simple. The existing ranges are not very specific. Take, for example, the excellent "Turfgrass Fertilization: A Basic Guide for Professional Turfgrass Managers" from Penn State. The first table in that document "lists the 16 essential nutrients, the form in which grass plants are able to use them, and the approximate amounts of each found…