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Message * Nitrogen Turnover in the Soil-Crop System Modelling of Biological Transformations, Transport of Nitrogen and Nitrogen Use Efficiency. Proceedings of a Workshop help at the Institute for Soil Fertility Research, haren, The Netherlands, 5–6 June 1990 : Proceedings of a Workshop held at the Institute for Soil Fertility Research, Haren, the Netherlands, June 5-6, 1990 - 0792311078 - 9780792311072