Titlebook: Evaluation of Soil Organic Matter Models; Using Existing Long- David S. Powlson,Pete Smith,Jo U. Smith Conference proceedings 1996 Springer

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Spannungs- und Drehmomenterzeugungin of scientific findings. This paper gives an overview of 50 selected long-term fertilisation experiments all of which are older than 30 years in Germany and Eastern Europe. Examples of evaluation are given. From the combined results from 13 long-term field experiments, the range of optimum mineral

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,Die Nevanlinnaschen Hauptsätze,edicting the effects of global environmental change on soil organic matter has been identified as a high priority within the Global Change and Terrestrial Ecosystems (GCTE) programme of the International Geosphere-Biosphere Programme (IGBP). The objectives of GCTE Task 3.3.1., “Soil Organic Matter”

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,Elektronische Fermi-Flüssigkeit,the former case, we assume that the measurements we make are the best representation of nature, and that model structure should follow. While this may simplify model testing, it may not yield a particularly useful description of SOM dynamics. There is no question that most of our knowledge about SOM

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Begriffe der Entscheidungstheorieduced by the model with actual values from field experiments. Such methods provide an immediate qualitative description of the differences, highlighting trends, different types of errors and distribution patterns of simulated and measured values. However, model evaluations or comparisons should idea

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