18. Ultisols: Low Base Status Soils with Finer-Textured Subsoil Horizons

  1. S. W. Buol B.S., M.S., Ph.D.1,
  2. R. J. Southard B.S, M.S., Ph.D.2,
  3. R. C. Graham3 and
  4. P. A. McDaniel B.S., M.S., Ph.D.4

Published Online: 5 AUG 2011

DOI: 10.1002/9780470960622.ch18

Soil Genesis and Classification, Sixth Edition

Soil Genesis and Classification, Sixth Edition

How to Cite

Buol, S. W., Southard, R. J., Graham, R. C. and McDaniel, P. A. (2011) Ultisols: Low Base Status Soils with Finer-Textured Subsoil Horizons, in Soil Genesis and Classification, Sixth Edition, Wiley-Blackwell, Oxford, UK. doi: 10.1002/9780470960622.ch18

Author Information

  1. 1

    North Carolina State University, Raleigh, USA

  2. 2

    University of California, Davis, USA

  3. 3

    University of California, Riverside, USA

  4. 4

    University of Idaho, Moscow, USA

Publication History

  1. Published Online: 5 AUG 2011
  2. Published Print: 2 SEP 2011

ISBN Information

Print ISBN: 9780813807690

Online ISBN: 9780470960622

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Keywords:

  • Ultisols, low base status soils - with finer-textured subsoil horizons;
  • Ultisols, and clay content increase - with depth, identifying argillic or kandic horizon;
  • Ultisols, forming in acidic parent materials - in locations, precipitation exceeding potential evapotranspiration;
  • Ultisols, in southeastern Asia - the upper Amazon basin in South America, the Congo River basin in Africa;
  • Ultisols, some classified as latosols or laterites - red color, in intertropical regions;
  • pedogenic processes - extensive leaching, over a long period;
  • lessivage, and formation - of argillic and kandic horizons, very pronounced;
  • Ultisols, dominant soils - formed on piedmont of southeastern United States;
  • timber production - extensive on many Ultisols;
  • significant Ultisol features – abrupt, or a clay content increase

Summary

This chapter contains sections titled:

  • Setting

  • Pedogenic Processes

  • Uses of Ultisols

  • Classification of Ultisols

  • Perspective