A rapid method for estimating the carbon concentration of fulvic acids

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Abstract
A simple method was developed for estimating the carbon concentration of fulvic acid from soil extracts at pH 2. Visible absorbance (410 nm) was measured in 20 samples of fulvic acids from different regions of Argentina. Linear regression analysis of absorbance as a function of carbon concentration yielded a high correlation coefficient (r = 0.983**). The proposed method is expected to be useful in assessing changes in organic matter content as a result of different tillage systems, erosion, plant residues, etc.