Efficient use of fertilizers in agriculture / United Nations Economic Commission for Europe. Symposium on Research into Agro-technical Methods Aiming at Increasing the Productivity of Crops--Co-efficients for the Most Efficient Use of Fertilizer Nutrients and Means for Reducing the Losses of Nutrients to the Environment under the Conditions of Intensive Agriculture (1983 : Geneva, Switzerland) United Nations. Economic Commission for Europe. Agriculture Section. United Nations. Economic Commission for Europe. Fertilizers Congresses. Crops Nutrition Congresses. Crop yields Congresses. S631.3 .S96 1983 631.81 19 UNE English and French. "Proceedings of the Symposium on Research into Agro-technical Methods Aiming at Increasing the Productivity of Crops--Co-efficients for the Most Efficient Use of Fertilizer Nutrients and Means for Reducing the Losses of Nutrients to the Environment under the conditions of Intensive Agriculture; organized by the Agriculture Section of the United Nations Economic Commission for Europe; held at Geneva, Switzerland, 17-21 January 1983." "United Nations Economic Commission for Europe." Includes bibliographies. Boston : Martinus Nijhoff/Dr. W. Junk for the United Nations c1983. c1983. 1983 Text vi, 352 p. : eng engfre Developments in plant and soil sciences ; v. 10