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Overconsolidation in Agricultural Soils: II. Pedotransfer Functions for Estimating Preconsolidation Stress

1996; Wiley; Volume: 60; Issue: 2 Linguagem: Inglês

10.2136/sssaj1996.03615995006000020007x

1435-0661

R. A. McBride, Pamela Joosse,

Soil Geostatistics and Mapping

A series of soil survey interpretive procedure, or pedotransfer functions (PTFs), are presented that follow from the hypothesis corroborated in the companion paper that the satureated compressive behavior of structured and of corresponding remolded agricultural soils in southern Outario were strongly related. The three PTFs were useful in characterizing the degree of overconsolidation as a physical indicator of soil quality on a regional basis. PTF1 identified soils as being highly overconsolidated when the void ratio difference between the normal compression line (NCL) at unit stress and e0 exceeded 0.36. The preconsolidation stress (ρ'c) of a soil was estimated from the dry bulk density measured in situ and from other soil properties needed to estimate the NCL of remolded soils (PTF2) or the virgin compression line of structured soils (PTF3). The PTFs sere tested on a data set comprised of soil horizons characterized in five county-level soil inventories that met the minimum PTF data requiremetns and other defined criteria (n = 210). All PTFs showed that the degree of soil overconsolidation increased significantly (P 150 kPa), whereas the coarser textured soils appeared to be closer to a normally consolidated condition. PTF3 corroborated most of these findings.