The reporting of regional or provincial soil test summaries has varying degrees of value depending
on the individual using the data. The monitoring of yearly data will give indications of “average”
soil nutrient supply changes over time. As well, year to year differences can provide the
fertilizer industry signals of anticipated demand. The relevance to an individual field is quite
limited. The data presented here is a summary of fall 2011, and a three year comparison of N, P,
K, and S soil supply rates as measured by PRS (Plant Root Simulator)™-Probe Technology at
Western Ag Labs Ltd.