Risk assessment of subsoil compaction for arable soils in Northwest Germany at farm scale.

Horn, Rainer and Fleige, H. (2009) Risk assessment of subsoil compaction for arable soils in Northwest Germany at farm scale. Soil & Tillage Research, 102 (2). pp. 201-208. DOI 10.1016/j.still.2008.07.015.

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The physically defined concept "precompression stress (Pc)" is presented at farm scale, including two operation methods in order to define precaution and critical values for the legislation and executive level according to the German Soil Protection Law. The first step is the prevention of subsoil compaction in general by the definition of the mechanical strength of soils, which is defined by the Pc. This Pc value is used as the precaution value, to ensure site-adjusted land use. The second step is to predict the change of soil functions after exceeding the Pc and furthermore to assess if critical values (test and action values) caused by subsoil compaction are reached or already exceeded. Criteria for the definition of critical values by subsoil compaction concerning crop production are discussed in order to also establish such values in the European Soil Framework Directive. The "Pc" concept, which includes predicted and regionalized "Pc"-maps, was verified on a research farm in the weichselian moraine landscape in Northern Germany for areas resistant or susceptible to soil deformation at the given water content throughout the year. Furthermore, the stress-dependent changes of the air capacity after exceeding the Pc was predicted by peclotransfer functions and linked with the farm soil map. As an additional proof for the validity of the Pc concept, a field experiment on a Stagnic Luvisol was also conducted in order to measure the stress distribution up to 60 cm depth using the Stress State Transducer (SST) system at two different wheel loads (3.3 and 6.5 Mg) using a tractor-pulled mono-wheeler. According to the effective soil strength, the wheel load should not exceed 3.3 Mg at field capacity to avoid subsoil compaction. (C) 2008 Published by Elsevier B.V.

Document Type: Article
Keywords: subsoil compactionprecompression stress stress distribution air capacity luvisol farm scale soil protection law physical-properties load deformation strength database fluxes impact n2o co2
Research affiliation: Kiel University
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.still.2008.07.015
ISSN: 0167-1987
Projects: Future Ocean
Date Deposited: 11 Feb 2011 12:16
Last Modified: 23 Sep 2019 19:43
URI: http://oceanrep.geomar.de/id/eprint/9460

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