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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

T. McM. Adams
T. McM. Adams
Affiliation:
Agricultural and Food Chemistry Department, The Queen's University of Belfast and Agricultural and Food Chemistry Research Division, Department of Agriculture for Northern IrelandNewforge Lane, Belfast, BT9 5PX
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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.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 98 , Issue 2 , April 1982 , pp. 335 - 342
Copyright
Copyright © Cambridge University Press 1982

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References

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