SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 34:610-612 (1970)
© 1970 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Organic Matter Content and Composition as Related to Ley Clipping Management and Fertilization1

K. H. Tan, J. H. Edwards, Jr., E. R. Beaty and R. A. McCreery2

ABSTRACT

Soil organic matter content' and composition, with particular attention to C/Porg and C/N relationship, were investigated under clipping and fertility treatments applied to Pensacola bahiagrass (Paspalum notatum, Flugge) grown on a Eustis loamy sand.

The results indicated that soil organic matter accumulation was influenced by the interaction of nitrogen fertilization and clipping management. Nitrogen fertilization alone had some effect, whereas clipping only had no influence on the organic C content of the surface soil. The C/N ratio decreased with depth in the profile with weekly clipping, but remained relatively constant from the surface to 30–40 cm depth with monthly clipping intervals.

The C/Porg ratio in the surface soil increased with increasing N-fertilization as well as by monthly and 6-weeks clippings. The effect of interaction of N-fertilization and clipping frequency on the C/Porg ratio was greater than the influence of clipping frequency or N-fertilization alone. The C/Porg ratio of the subsoil was unaffected by either.

NOTES

1 Journal Series Paper no. 679 of the University of Georgia, College of Agricultural Experiment Stations, College Station, Athens, Ga. 30601.

2 Assistant Professor, Graduate Assistant, Professor, and Associate Professor, University of Georgia, Athens, respectively.

Received for publication December 1, 1969. Accepted for publication March 18, 1970.






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