Simulation of nitrogen behaviour of soil-plant systems : 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 Soils Plant-soil relationships 631 CEN 1981 A052 Or. Workshop sponsored by IUBS (International Union of Biological Sciences [and others] Wageningen, Netherlands : Centre for Agricultural Publishing and Documentation, 1981 1981 Text 277 p. :