An intuitive understanding of ppm in the turfgrass rootzone

Fertilizer added to the soil surface is in units of mass per area. Pounds per 1000 square feet, pounds per acre, kg per hectare, grams per square meter, that type of unit. Soil is a three-dimensional space, and we can think of the turfgrass rootzone as having both a volume and a mass. There's the area of the soil surface, multiplied by the rootzone depth, and that gives us the volume of the soil. Then multiply the volume of the…