Organic Fertilizer # 100 mesh very fine sandstone ( dolomite ) calcium 22.99 % magnesium 12.35 % Cd 3.74 ppm Pb 33.00 ppm Superfined (# 100 mesh ) for faster soil pH correction and availability of Ca & Mg nutrients. It's the only way lime is really effective! Coarse - sized lime takes years to react! FACT: Acidic soil decreases fertilizer effectiveness. You're wasting 33% of your NPK Fertilizer inputs if your soil pH is 5.5 With GRD Orgadol Fertilizer is made from carefully selected dolomite mineral with an optimally-balanced. Magnesium & calcium Nutrients Superfined using state-of-the-art pulverizing technology to ensure faster soil pH correction and Magnesium & calcium uptake by plants.