Humates are natural, safe materials that exist at varying levels in all soils. Most soils, however, are depleted and lack the amounts of organic matter and biological activity necessary for optimal plant growth. Humates contain their own stable culture of microbes that assist in transferring and releasing nutrients that are trapped in the soil. Humic Acid increases water holding capacity, provides carbon to the soil, reduces soil erosion, and promotes growth of living cells. Use Humic Acid to encourage healthier plants, faster growth, and increased yields. 4 lb. bag covers 400 square feet when used as a top dressing.