Humic Acid Elemental Composition and Ratios
Carbon content of humic acid was highest in the case ofAzadirachta indica followed by Dalbergia sissoo andGmelina arborea . It had increased from 34.95% to 41.96%, 16.31% to 28.65% and 18.50% to 21.16% under Azadirachta indica, Dalbergia sissoo and Gmelina arborea with increase in year of reclamation for surface soil(Table-6). Humic acid nitrogen content was highest in the case of Azadirachta indica followed byDalbergia sissoo and Gmelina arborea . C/N ratio had increased with increase in year of reclamation except in case ofGmelina arborea . Highest C/N ratio was observed in case ofGmelina arborea . C/H ratio was highest in case of