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Precision Agriculture

, Volume 7, Issue 5, pp 309–326 | Cite as

Evaluation of the soil penetration resistance along a transect to determine the loosening depth

  • H. Domsch
  • D. Ehlert
  • A. Giebel
  • K. Witzke
  • J. Boess
Original Paper

Abstract

The objective of this study was to evaluate the distribution of soil strength (measured as cone index, CI) along a 600 m transect and to determine the soil loosening depth necessary to eliminate zones with soil strengths exceeding a threshold value down to a depth of 0.6 m. The transect was located at a site in a glacial drift area which was characterised by sandy deposits overlying boulder clay. A tractor-mounted multi-penetrometer array consisting of four hydraulically driven single vertical penetrometers was used to determine CI at 1-m sampling intervals as a measure of penetration resistance. The spatial fluctuation of the CI readings in general and that of repeatedly averaged readings along the transect was examined. Furthermore, the relationships between the penetration resistance of several soil layers and the relationships between the CI of single penetrometers were identified. Averaged CI values over 5-m intervals were used to determine the depth of soil loosening required. By using various data sub-sets based on the averaged data of the four array mounted penetrometers and simulating several different sampling intervals, treatment intervals and threshold values of soil strength, a sampling interval of about 10 m proved to be sufficiently accurate to determine the loosening depth required.

Keywords

Soil strength Cone index Site-specific soil loosening Penetrometer Sampling interval Soil layers 

Notes

Acknowledgements

The authors thank the ATB staff members U. Frank, M. Heisig, H.-J. Horn, and S. Kraatz for assisting the investigations in many ways. Furthermore, thanks goes to W. B. Herppich for helpful comments on an early draft of this paper.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • H. Domsch
    • 1
  • D. Ehlert
    • 1
  • A. Giebel
    • 1
  • K. Witzke
    • 1
  • J. Boess
    • 2
  1. 1.Leibniz Institute of Agricultural Engineering Bornim (ATB)PotsdamGermany
  2. 2.Geological survey of Lower Saxony (NLfB)HannoverGermany

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