Nutrient Removal.

I recently received an article about using nutrient removal rates to calculate fertilizer needs.  It is an old concept that should be put to rest.  We find that a better concept is "what is the fertility of the soil, and is it enough to get through seasonal variations and produce a top yielding crop?" Nutrient removal also does not necessarily take into account variations within the field, although some people are looking at yield maps to determine fertility needs.  Looking at yield maps does no good unless you already know where your fertility levels are.  Also, keep in mind that the soil does not always do what the book says it will.  The best way to determine fertilizer needs is a good soil testing program.