Claypan

Claypan is a dense, compact, slowly permeable layer in the subsoil.^[1] It has a much higher clay content than the overlying material, from which it is separated by a sharply defined boundary. The dense structure restricts root growth and water infiltration. Therefore, a perched water table might form on top of the claypan.^[2] In the Canadian classification system, claypan is defined as a clay-enriched illuvial B (Bt) horizon.^[3]

^ Conway, L. S.; Yost, M. A.; Kitchen, N. R.; Sudduth, S. (2017). "Using topsoil thickness to improve Site‐Specific phosphorus and potassium management on claypan soil". Agronomy Journal. 109 (5): 2291–2301. doi:10.2134/agronj2017.01.0038.
^ Hsiao, C.; Sassenrath, G. F.; Zeglin, L. H.; Hettiarachchi, G. M.; Rice, C. W. (2018). "Vertical changes of soil microbial properties in claypan soils". Soil Biology & Biochemistry. 121: 154–164. doi:10.1016/j.soilbio.2018.03.012. S2CID 90573070.
^ Government of Canada (13 December 2013). "Glossary of terms in soil science".

[Conway_et_al_2017-1] Conway, L. S.; Yost, M. A.; Kitchen, N. R.; Sudduth, S. (2017). "Using topsoil thickness to improve Site‐Specific phosphorus and potassium management on claypan soil". Agronomy Journal. 109 (5): 2291–2301. doi:10.2134/agronj2017.01.0038.

[auto1-2] Hsiao, C.; Sassenrath, G. F.; Zeglin, L. H.; Hettiarachchi, G. M.; Rice, C. W. (2018). "Vertical changes of soil microbial properties in claypan soils". Soil Biology & Biochemistry. 121: 154–164. doi:10.1016/j.soilbio.2018.03.012. S2CID 90573070.

[3] Government of Canada (13 December 2013). "Glossary of terms in soil science".

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