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Published in Soil Sci Soc Am J 60:472-476 (1996)
© 1996 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Fertilization Effects on Soil Organic Matter Turnover and Corn Residue C Storage

E. G. Gregorich* and B. C. Liang

Agriculture and Agri-Food Canada, Center for Land and Biological Resources Research, Ottawa, ON, K1A 0C6, Canada

B. H. Ellert

Agriculture and Agri-Food Canada, Research Centre, Lethbridge, AB, T1J 4B1, Canada

C. F. Drury

Agriculture and Agri-Food Canada, Research Centre, Harrow, ON, N0R 1G0, Canada

*Corresponding author.

ABSTRACT

Soil organic matter turnover is influenced by N; thus long-term fertilization of corn (Zea mays L.) may significantly affect soil organic matter levels. Effects of fertilization on soil organic matter turnover and storage of residue C under continuous corn were evaluated using soils from a long-term field experiment in Ontario. Total organic C and natural 13C abundance measurements indicated that fertilized soils had more organic C than unfertilized soils, the difference accounted for by more C4-derived C in the fertilized soils. About 22 to 30% of the soil C in the plow layer had turned over and was derived from corn in the fertilized soils; in unfertilized soils only 15 to 20% was derived from corn. Assuming that organic matter turnover follows first-order kinetics, the half-life of C3-derived C in the surface 10 cm of both soils was the same, about 19 yr. Natural 13C abundance measurements and estimates from a soil organic matter model indicate that 10 to 20% of the added residue C was retained in the soil. Fertilized soils had more light fraction (LF) C than unfertilized soils. More than 70% of the C in the LF of fertilized soils was derived from corn; in unfertilized soils only 41% was derived from corn. The half-life of C3-derived C in the LF was shorter than 10 yr. These results indicate that adequate fertilization increases crop yields, in turn leading to greater C storage, and that fertilization does not significantly alter the rate of turnover of native soil organic matter.

Received for publication February 15, 1995.


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