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The char fraction was separated from the <53 um fraction using high-energy ultra violet (UV) photo-oxidation... Figure 3 shows the changes in OC in the three fractions >200 um, 200-53 um and <53 um for the Waite soil with the equivalent of 30 and 0 tC ha -1(a and c) and the Lemnos loam soil (b and d) after the addition of plant residues... A knowledge of the chemistry of the fractions is essential if they are to be used to accurately predict soil properties and behaviour...
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