P fertilizer recommendations: there's a big difference between methods

There are four steps to a soil test. First is sampling, then laboratory analysis, then interpretation of the results, and finally the calculation of a fertilizer requirement based on the results. For a specific turfgrass site, a key thing to be certain of is that the soil test interpretation and recommendation ensure that deficiencies are prevented. Once we are certain that the amount of fertilizer recommended is enough to prevent deficiencies, that's about the end of that round of soil…