“…Small angle neutron scattering studies of soils showed that the colloidal component of soils has a fractal organization [4][5][6][7]. More recent studies per formed by electron, atomic force, and tunnel micro scopy [8] imply that the humic matrix in soil gels (hereafter referred to as the humic gel matrix) consists of fractal clusters having sizes of 100-200 nm, which are built of primary particles of humic substances (hereafter, referred to as humic particles) having sizes of 2-12 nm.…”