Sara F. Wright, a soil scientist with the ARS (Agricultural Research Service) in the USA has show that Glomalin is structurally different from any other component of organic matter in soils. It is a metabolic bi-product of symbiotic fungal. As the plant roots grow, Glomalin sloughs off into the soil where it acts as a "super glue," helping sand, silt and clay particles to stick to each other and to other organic matter. It is Glomalin that helps give good soil its smooth clumpy feel and it does much of what 'humus' has been credited with; there is much more Glomalin in the soil than Humic acid. It is calculated that Glomalin holds 27% of total soil carbon, compared to humic acid's 8%. It also provides nitrogen to soil and gives it the necessary structure needed to hold water, for proper aeration and for stability to resist erosion. www.ars.usda.gov