Humic acids are the humified organic substances which provide nutrition to the ground and soil life. Organic matter falls to the ground and underground roots die off in nature. This organic matter does not decompose but humificates. This causes the forming of the substance humus after a long process. Humus is formed by the decomposition of vegetable or animal carbon. The humification process is mainly carried out by bacteria. Humus can be built up in the soil for a long time. Eventually it will be transformed into fulvic acid. This substance is much lighter than humus and has a different structure.