Carrying a formulation of 0-3-0. Phosphate fertilizers are obtained from phosphorites of sedimentary or magmatic origin. Contains 3 percent available and 24 percent total phosphate. Organic rock phosphate provides phosphorous for all flowering plants. Our CalPhos comes from phosphate rock mined in Florida, which was formed millions of years ago from the mineralized remains of marine creatures. Rock phosphate contains about … Phosphate mined from rock mineral deposits is usually granulated for ease of application, it contains 20 percent phosphorous and 48 percent calcium, this can raise soil pH so use needs to be avoided if your soil is already alkaline. Promotes root growth. Rock phosphates from some areas (e.g., Curacao) are low in fluorine, whereas those from other areas must be defluorinated before they can be used. Used as a soil conditioner. Sedimentary phosphate rock usually is strip-mined and contains high concentrations of 238 U (800–5200 Bq/kg), 230 Th (200–16,000 Bq/kg), 232 Th (5–170 Bq/kg), and 226 Ra (25–900 Bq/kg). Defluorination of rock phosphate is an industrial process that is suitable only for large-scale production. Soft Rock Phosphate should not be confused with Hard Rock Phosphate. Mined from phosphorous rich natural deposits. As a mineral resource, “phosphate rock” is defined as unprocessed ore and processed concentrates that contain some form of apatite, a group of calcium phosphate minerals that is the primary source for phosphorus in phosphate fertilizers, which are vital to agriculture. Comes in 7.25-pound bag. All natural and pelletized for easy application. Soft rock phosphate, also called CalPhos or colloidal phosphate, is a great source of potassium and calcium for your plants.