AgriGrow 0-0-5 Humic Acid (80%) is 100% water-soluble and can be used as a soil or foliar application. It may enhance nutrient uptake by plants. It is compatible with most powdered and liquid fertilizers, biological and enzymatic formulations. To make a 5% humic acid solution, add 65 grams of AgriGrow Humic Acid powder to 1 liter of water.