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By Edgar L Michalson; Robert I Papendick; John E Carlson; Solutions to Environmental & Economic Problems (Organization)

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662, Washington State University, Pullman, 1–7. , 1982. Solutions to Environmental and Economic Problems (STEEP), Science, 217, 904–909. , 1983. E. O. , Dryland Agriculture, Agonomy Monograph 23, American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Madison, WI, 273–290. , 1985. F. A. , Soil Erosion and Crop Productivity, American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Madison, WI, 305–320. L. , 1985.

Soils with profiles like those of the upper backslope and summit in the Pullman area are in the Garfield, Naff, and Staley series. These soils tend to shed water because of their landscape position and have low infiltration rates because of poor soil structure (Pierson and Mulla, 1990). This, in turn, increases water runoff to lower slope positions and decreases plant-available water on shallow soil sites. They can crust severely, which will reduce seedling emergence. , 1992). , 1995). In this precipitation zone, an albic (leached and white) subsoil horizon commonly overlies the argillic horizon on backslope, footslope, and toeslope positions of north-facing slopes (Rieger and Smith, 1955).

The watershed version contains additional components that deal with channel hydrology and hydraulics, channel erosion, and impoundments (Flanagan and Nearing, 1995). For the NWRR, WEPP includes winter routines that deal with snowmelt, effect of freezing and thawing on soil erodibility, and the transient nature of erosion processes in the region. WEPP is currently in the status of testing and validation for NWRR conditions. 2 PREDICTION ACTIVITIES IN THE NORTHWESTERN WHEAT AND RANGE REGION Soon after development of the USLE (Wischmeier and Smith, 1965), attempts were made to apply it to the NWRR.

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