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Annals of Botany 62: 531-536, 1988
© 1988 Annals of Botany Company

RESEARCH-ARTICLE

Nitrogen Fixation, Nodule Numbers Per Unit Ground Area and Bioenergetics

J. E. SHEEHY*, T. HOLLOWAY{dagger}, F. I. WOODWARD{dagger} and G. GOSSE{ddagger}

*The AFRC Institute for Grassland and Animal Production Hurley, Maidenhead, Berks SL6 5LR, UK*
{dagger}Department of Botany, University of Cambridge Cambridge, CB2 3EA UK{dagger}
{ddagger}INRA, Station de Bioclimatolgie 78850 Thiverval-Grignon, France{ddagger}

Accepted: 7 June 1988   

The utilization of dinitrogen by legumes is influenced by the genetic characteristics of both the plant and the Rhizobium resident in root nodules. The number of nodules required to meet the demand for nitrogen depends on the capacity of individual nodules to supply nitrogen and the availability of soil nitrogen. In this paper some simple equations are derived which enable the number of nodules per unit ground area to be calculated. Further calculations are made of nodule mass, specific nodule respiration and the work required to expand nodules against the impedance of the soil.

Nitrogen fixation, nodules, respiration, bioenergetics


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