Dirt M.D.’s major components are humic (4.5% by volume) and fulvic acids (2.3% by volume). Both of these organic compounds have a large concentration of binding sites that allow them to act like “sponges“. They bind to not only soil and water particles but also to nutrient ions, thus localizing all these near the root zone.1 These complexes breakdown over time with microbial activity allowing for slow-release of nutrients.
This feature allows nutrient ions to not leech away but be present to allow plants to uptake them over time improving their use efficacy. This helps growers save money as their nutrient additions will go longer.
Additionally, fulvic substances, more active than humic acids, are readily taken up into the plant through foliage and root systems,and linked to increased plant cell division.2
1 – Stevenson F.J. 1982. Humus Chemistry-Genesis, Composition, Reactions. John Wiley and sons, New York
2 – Sladky Z. 1967. Effect of hyumus acids on the growth of isolated roots. In Humus et Planta IV, 286-287