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The effects of agronomy on C and N distribution in soil organo-mineral fractions
Published online by Cambridge University Press: 27 March 2009
Summary
Soils from grass-arable cropping sequences and from an experiment where grassland had been treated with slurry were dispersed by shaking as a soil-water mixture, followed by ultrasonic treatment. Organo-mineral particle size fractions were separated by sieving and by sedimentation.
Generally, concentration of C and N in the fractions decreased with increasing particle size. However, when expressed as weight of C per fraction maximum contents were in the 2–10 μm range. With N, maximum contents occurred about 2 μm. Largest differences in C and N contents between soils were found in the 0·2–20 μm size range.
Identification of the source of the materials in the various fractions was attempted by interpretation of the C/N ratios, but was generally inconclusive.
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