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  1. 1
    The effect of fertilization and crop rotation on soil chemical and biological properties. Field trials on a clay soil in Southern Finland

    The effect of fertilization and crop rotation on soil chemical and biological properties. Field trials on a clay soil in Southern Finland by Aila Mettälä, Maarit Koponen, Heikki Pirinen

    Published 1982-12-01
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    Article
  2. 2
    Measuring methods for soil microbial activity and biomass

    Measuring methods for soil microbial activity and biomass by Helvi Heinonen-Tanski, Aila Mettälä, Riitta Silvo

    Published 1984-09-01
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    Article

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