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Water Retention of Soft Siltstone Fragments in a Ustic Torriorthent, Central Montana

Dep. of Plant and Soil Sci., Montana State Univ., Bozeman, MT 59717

J. Ruddell

American Colloid, HCR-69, Box 135, Belle Fourche, SD 57717

* Corresponding author.

ABSTRACT

Some soils in the western USA overlie or contain fragments of porous sedimentary rock. Estimations of plant-available water that neglect water retained in the rock may be in error. Using pressure-plate and newly modified tension-table techniques, we measured the water retained at nine water potentials ranging from 0 to –1500 kPa in fissile siltstone fragments from the Cr horizon of a Ustic Torriorthent developed on the Fort Union formation in central Montana. The siltstone fragments held 0.10m³ m^–3 plant-available water, assuming –1500 kPa (–15 bar) as the lower limit of water availability.

Contribution no. J-2386 from Montana Agric. Exp. Stn.

Received for publication January 11, 1991.

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