Humic acid has been shown to enhance soil structure and fertility, alter root architecture and improve nutrient uptake. Water soluble powder that can be mixed with soil or used as a foliar spray. Base 5% Humic Acid concentrate - Add 65 grams/1 litre or 6.5 kilograms/100 litres of EZ-Gro 0-0-5 Humic Acid (80%) to water and mix vigorously.