Determination of humic substances in different types of compounds
DOI:
https://doi.org/10.6008/CBPC2179-6858.2018.007.0025Keywords:
Composting, Humic Acids, Fulvic AcidsAbstract
The humic substances present in soil organic matter represent the most reactive compartment in soils. Thus measuring the changes occurring in soil organic matter (SOM), which originate the humic substances (humic acids (AH), fulvic acids (AF) and humina (H)), helps in the process of differentiation between organic compounds and vermicompost that have passed through composting systems. Thus, the aim of this study was to determine the humic substances present in two types of organic compounds, being the commercial substrate and a commercial substrate added to the vermicomposting of fruits and vegetables, as well as to perform a comparative and to define the differences as the contents of the fractions of the humic substances found in them. The methodology used to determine the humic substances and their fractionation, the infrared spectroscopic analysis to characterize the different compounds was based on Antunes (2009). The commercial compound added to vermicomposting of fruits and vegetables had a higher humification index and humification percentage. On the other hand, the commercial compound presented the highest fractions of AH and FA and higher contents of aromatic compounds. The predominance of humic acids over fulvic in both compounds indicated that the processes of proper humification of the residues for the two compounds evaluated occurred.
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