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Mettälä, A., Koponen, M., Pirinen, H. and Korkman, J. 1982. The effect of fertilization and crop rotation on soil chemical and biological properties. Field trials on a clay soil in Southern Finland. Agricultural and Food Science. 54, 5 (Dec. 1982), 331–344. DOI:https://doi.org/10.23986/afsci.72114.