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Gewählte Doctoral Thesis:

Peter Hamedinger (2004): Beurteilung der Druckbelastung auf den Boden durch unterschiedliche Ernteverfahren bei der Zuckerrübenernte.
Doctoral Thesis, BOKU-Universität für Bodenkultur. UB BOKU obvsg

Data Source: ZID Abstracts
A field trial on a typical site for sugar beet growing was carried out in Tulln (Lower Austria). The aim of this trial was to investigate the soil loading caused by an one-row pulled sugar beet harvester and six-row self propelled sugar beet harvester with different axle load (8.5/24/32.5/41 t) during harvest. The soil (wet tschernosem) has a pre-compaction zone at the depth of 25 cm. Soil resistance measurements were made with fast, non-destructive, cheap and repeatable methods, which have a great importance in this investigation area. Measurements with a soil penetrometer causes a high data-variability. Due to a complex trial design and statistical modelling, the explanatory power of results could be strengthen. The frequency of passing and the significant higher contact pressure of an one-row harvest-system causes in dry harvest condition a plastic deformation in the top soil. This result could not be reached by the six-row sugar beet harvester with the different axle loads. The six-row sugar beet harvester has a load-optimisation through broad tyre and adjusted inflation pressure. On certain plots with the highest load (41 t) a tendential increasing trend of soil penetration resistance and bulk density beneath the plough pan was measured. The analysis of the soil penetration data was carried out with a descriptive method (like box-plot), trendline-method and 3D-scatterplot. The increasing influence of high axle load on bulk density in zone beneath the plough pan could be proved. The result of this investigation shows the difficulty to develop a comprehensive awareness for the different effects of soil stress and their consequences. With increasing moisture content and axle load the risks for soil compaction in the deeper zones increases in spite of the technical development of the used tyres.

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