HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Hétier, J. M. Articles by Marol, C. Search for Related Content PubMed Articles by Hétier, J. M. Articles by Marol, C. Agricola Articles by Hétier, J. M. Articles by Marol, C.

Organic Matter Inputs to Soil After Growth of Carbon-14-Nitrogen-15 Labeled Maize¹

ABSTRACT

After growth of doubly labeled (¹⁴C and ¹⁵N) maize (Zea mays L.), two loamy soils were labeled by root exudation and rhizodeposition, and by direct microbial immobilization of N. Fresh roots were then carefully separated and washed, eliminating organic and organomineral cementing agents by acid and alkaline solubilizing reagents, and the remaining insoluble humin was water dispersed in order to separate coarse, medium, and fine fractions. At harvest time, fresh roots represented 85% of the total C input, and rhizodeposition 15%. Sixty to 70% of the N input was still in living roots at this time, and other organic forms of N were more a result of microbial activity than of rhizodeposition. The largest and most homogeneous organic fraction was the finest insoluble fraction, in which about half of the label for both C and N was found.

¹ Contribution from the Centre de Pédologie Biologique, CNRS, B.P. 5 54501, Vandoeuvre-lés-Nancy, Cedex, France, and from the Service de Radio-agronomie, Dép. de Biologie, C.E.A., B.P. 1 13115 Saint-Paul-lez-Durance, France.

² Research Soil Scientists (CNRS), Soil Chemist (CNRS), and Soil Chemist (CEA), respectively.

Received for publication June 5, 1984. Accepted for publication August 15, 1985.

This article has been cited by other articles:

				B. Amos and D. T. Walters Maize Root Biomass and Net Rhizodeposited Carbon: An Analysis of the Literature Soil Sci. Soc. Am. J., August 3, 2006; 70(5): 1489 - 1503. [Abstract] [Full Text] [PDF]

				D. Ginting, A. Kessavalou, B. Eghball, and J. W. Doran Greenhouse Gas Emissions and Soil Indicators Four Years after Manure and Compost Applications J. Environ. Qual., January 1, 2003; 32(1): 23 - 32. [Abstract] [Full Text] [PDF]