Comparative Determination of the Spectral Properties and Colloidal Behaviour of Humic Acids of Sal Forest Soils of Doon Valley Planted with Eucalyptus

The conditions of Eucalyptus monoculture has promoted the formation of humic acids in soils with a clearly expressed aromatic rings as comapared to surrounding sal. Correspondingly the number of peripheral chains has decreased and the hydrophillic nature is less marked; humic acids are only slightly dispersed and coagulate even with small amounts of electrolyte.