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Plant and Soil

, Volume 215, Issue 1, pp 85–91 | Cite as

Estimating C inputs retained as soil organic matter from corn (Zea Mays L.)

  • M.A. Bolinder
  • D.A. Angers
  • M. Giroux
  • M.R. Laverdière
Article

Abstract

In agroecosystems, the annual C inputs to soil are a major factor controlling soil organic matter (SOM) dynamics. However, the ability to predict soil C balance for agroecosystems is limited because of difficulties in estimating C inputs and in particular from the below-ground part. The objective of this paper was to estimate the proportion of corn residue retained as SOM. For that purpose, the results of a 13C long-term (15 yr) field study conducted on continuous silage corn and two silage corn rotations along with data from the existing literature were analyzed. The total amount of corn-derived C (0–30 cm) was about 2.5 to 3.0 times higher for the continuous corn treatment (445 g m-2), compared to the two rotational treatments (175 and 133 g m-2 for the corn-barley-barley-wheat and corn-underseeded barley hay-hay rotations, respectively). Assuming that the C inputs to the soil from silage-corn was mainly roots and would have been similar across treatments on an annual basis, the total amount of corn-derived C for the two rotational treatments was approximately proportional to the number of years the silage-corn was present in the rotation (4 yr). The results from the current study indicate that about 17% of root-derived C is retained as SOM. This value is higher than those reported in the literature for long-term studies on shoot-derived C (range of 7.7 to 20%, average of 12.2%), which is in agreement with previous studies showing that more C is retained as SOM from roots than from shoots.

13corn (Zea mays L.) shoot:root ratio shoot- and root-derived C soil organic matter 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • M.A. Bolinder
    • 1
  • D.A. Angers
    • 1
  • M. Giroux
    • 2
  • M.R. Laverdière
    • 3
  1. 1.Centre de recherche et de développement sur les sols et les grandes culturesAgriculture et Agroalimentaire CanadaSainte-Foy (Québec)Canada
  2. 2.Centre de recherche et d'expérimentation en solsMAPAQ, Complexe ScientifiqueSainte-Foy (Québec)Canada
  3. 3.Département des sols et de génie agroalimentaireUniversité LavalSainte-Foy (Québec)Canada

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