GAIA GREEN® ORGANICS Rock Phosphate is a naturally occurring mineral, which has been ground to a fine powder. Plants with high cation exchange root systems (legumes and grains) are found to be effective in obtaining phosphorous from soil and rock phosphate. This product can be very effective when used in conjunction with cover cropping. A natural mined mineral finely ground to improve nutrient availability. An excellent source of slow-release phosphorus to improve long-term soil fertility. Available in both powder and pelleted forms.