papers of a workshop, models for the behaviour of nitrogen in soil and uptake by plant, comparison between different approaches, Wageningen, the Netherlands, January 28 - February 1, 1980 Frissel, M. J Veen, J. A. van International Union of Biological Sciences text Wageningen, Netherlands Centre for Agricultural Publishing and Documentation 1981 monographic 277 p. : ill. ; 25 cm Workshop sponsored by IUBS (International Union of Biological Sciences [and others] Soils Plant-soil relationships 631 CEN 1981 A052 Or. 9022007359