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In the present investigation, different tillage and management practices interventions were assessed to note the changes in the composition of humic substances using Fourier transform infrared (FTIR) techniques, optical density (E4/E6) measurement and elemental composition of humic acid. One uncultivated and four reclaimed alkali surface (0-0.15 m) soil samples after adoption of four years different tillage and management practices were collected from Central Soil Salinity Research Original Research Article Suman et al.; CJAST, 39(37): 12-22, 2020; Article no.CJAST.63371 13 Institute, Karnal. Optical density (E4/E6) of fulvic acid was higher than that of humic acid. This was due to the more condensed and more matured nature of humic acid than fulvic acid. The trend of E4/E6 ratio was farmers practices in rice-fallow-wheat cropping system with puddled rice and conventional tillage wheat without crop residue addition (FP in R-F-W) > integrated crop and resource management in rice-wheat-mungbean cropping system (ICRM in R-W-M)> futuristic and diversified (CA) based system of maize-wheat-mungbean cropping system (FDCA in M-W-M) >UnK> Conservation agriculture (CA) based system in rice-wheat-mungbean cropping system (CA in R-W-M). The highest stability was recorded in CA in R-W-M and the lowest in FP in R-F-W. Elemental composition of extracted humic acid revealed that carbon content in humic acid varied from 47.53% in uncultivated soils to 51.32% in ICRM in R-W-M. The nitrogen content in humic acid varied from 4.38% in FDCA in M-W-M to 4.89% in CA in R-W-M. Soils having the lowest C/N value was observed 10.03 in CA in R-W-M and the highest C/N ratio of value 11.72 was recorded in FDCA in M-W-M. Wave no. (cm) & proposed functional group of extracted humic acid revealed that FTIR peak at 1507-1508 cm -1 in CA in R-W-M, aromatic -C=Cpeak was absent in FDCA in MW-M and in FP in R-F-W it was replaced by aliphatic C-H stretch.

current journal of applied science and technology

FTIR Spectroscopy and Optical Density Characterization of Humic Substances Extracted from Reclaimed Alkali Soils under Different Tillage and Management Practices