Methodological choices in size and density fractionation of soil carbon reserves - A case study on wood fiber sludge amended soils.

Distribution of fiber-sludge derived SOC in size and density fractions The fiber amendment was found to increase C in the free POM fractions excluding the coarse POM in the clay soil, whereas in the mineral associated fractions differences between treatments did not turn significant though an increasing trend was apparent in the clay soil ( Table 4 , Fig. 3 ).

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