Nitrogen efficiency in agricultural soils : a Seminar on Nitrogen Efficiency in Agricultural Soils and the Efficient Use of Fertilizer Nitrogen, held in Edinburgh, 16-18 September 1987, as part of the EC Programme for the Coordination of Agricultural Research / ed. by D.S. Jenkinson and K.A. Smith. Seminar on Nitrogen Efficiency in Agricultural Soils and the Efficient Use of Fertilizer Nitrogen (1987 : Edinburgh, Scotland) Jenkinson, D. S. (David S.) Smith, Keith A., 1940- Commission of the European Communities. Coordination of Agricultural Research. Nitrogen fertilizers Congresses. Soils Nitrogen content Congresses. Plants Effect of nitrogen on Congresses. Crops Nutrition Congresses. S651 .S44 1987 631.84 19 JEN "Sponsored by the Commission of the European Communities, Directorate-General for Agriculture, Coordination of Agricultural Research Division." Includes bibliographies. London : Elsevier Applied Science, c1988. c1988. 1988 Text ix, 450 p. : eng