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A Procedure for Isolating Soil Organic Matter Fractions Suitable for Modeling

^a Agriculture and Environment Div., IACR-Rothamsted, Harpenden, Herts, AL5 2JQ, UK
^b Dep. of Chemistry, Queen Mary, University of London, London, E1 4NS, UK
^c AAT Consultants, 15 Clerk Street, Edinburgh, EH8 9JH, UK
^d Dep. of Soil Science and Agricultural Chemistry, Szent István University, 2103 Gödöll, Hungary

View larger version (34K): [in a new window]   Fig. 1. Organic matter recovered in (a) free and (b) intra-aggregate fractions at different separation densities and duration of ultrasonic dispersion (s.e.d. is the standard error in differences of means).

View larger version (51K): [in a new window]   Fig. 2. The effect of NaI density on yield of organomineral clay from heavy clay soil, with increasing duration of ultrasonic dispersion. Bars indicate the standard error.

View larger version (35K): [in a new window]   Fig. 3. A standard protocol for isolation of organic matter fractions suitable for modeling.

View larger version (73K): [in a new window]   Fig. 4. Contrasting appearance of (a) free and (b) intra-aggregate fractions isolated on glass fiber filters.

View larger version (94K): [in a new window]   Fig. 5. Carbon-13 nuclear magnetic resonance (NMR) spectra for fractions obtained by density–size versus size-only fractionation from (a) sandy loam (b) silty clay loam and (c) heavy clay soils.

View larger version (22K): [in a new window]   Fig. 6. Comparison of diffuse reflectance Fourier transform infrared (DRIFT) spectra for free and intra-aggregate organic matter fractions from (a) sandy loam (b) silty clay loam and (c) heavy clay soils.