Empirical equation to describe the effect of pH on organic matter release from mucks
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Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin 27, Poland
Int. Agrophys. 2005, 19(4): 323–328
The effect of high pH values on release of organic matter from mucks was investigated. This study was conducted on homoionic hydrogen forms of 13 meadow muck samples (Terric Histosols). States of secondary transformation were estimated using the water holding capacity index, W1 which is the ratio of the centrifuge moisture equivalent measured after predrying at 105°C and one week rewetting to the centrifuge moisture equivalent of fresh sample. Concentrations of dissolved organic matter (DOM) released were determined colorimetrically at 465 nm. The dissolution of soil organic matter was significantly affected by pH. The relationship could be satisfactorily described by the equation: DOM = 0.01 exp(b1 pH). The b1 parameter quantified the DOM release process in relation to the changes in soil pH.