When are K-Mag Fertilizer and dolomitic lime used?
K-Mag works best to supply sulfur, potassium and magnesium when the soils are deficient or the fertilizer is desired for other reasons. Dolomitic limestone, which contains 12% or less magnesium in a form that is not water soluble, is applied to soils when the soil pH is lower than desired. K-Mag can be used any time magnesium is needed. Dolomite provides magnesium only when applied to raise the soil pH. The magnesium availability to the crops is slow and only at the same rate that the lime reacts to raise the soil pH. Therefore, K-Mag is recommended on low pH soils along with dolomite, so the crop will have a readily available source of magnesium before the dolomitic lime releases magnesium.
