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Research article - Peer-reviewed, 2005

Nitrogen and phosphorus limitations of microbial respiration in a tropical phosphorus-fixing acrisol (ultisol) compared with organic compost

Ilstedt U, Singh S


We studied the nutrient I imitations of microbial respiration over time after the addition of glucose (G), glucose + nitrogen (G + N) or glucose + phosphorus (G + P) to a phosphorus-fixing tropical acrisol down to a depth of 80 cm, compared with those from compost. In the acrisol, the initial rate of respiration increase was higher when P was added together with glucose than when P was excluded. Without N, respiration reached a plateau faster and at a lower level than when N was added in excess. With glucose alone, the respiration kinetics followed the lower of the curves with G + N or G + P at any given time. Thus, nitrogen limited the maximum level of microbial respiration in the acrisol if ample carbon was available, but the initial respiration rate was limited by phosphorus. In contrast, for compost respiration was always lowest when N was not added. In conclusion, microbial respiration depended on the P-fixing properties of the soil, the time scale and the carbon availability. © 2005 Elsevier Ltd. All rights reserved

Published in

Soil Biology and Biochemistry
2005, Volume: 37, number: 7, pages: 1407-1410

    SLU Authors

    • Ilstedt, Ulrik

      • Department of Forest Ecology, Swedish University of Agricultural Sciences

    UKÄ Subject classification

    Environmental Sciences related to Agriculture and Land-use

    Publication Identifiers


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