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10566. Wilson, J.P., S.P. Sandor, and G.A. Nielsen. 1991. Productivity index model modified to estimate variability of Montana small grain yields.. Soil Sci. Soc. Amer. J. 55: 228-234.
The productivity index (PI) model estimates crop productivity by characterization of the soil rooting environment and evaluates a soil's vulnerability by simulated removal of surface soil and consideration of three soil properties: available water-holding capacity, bulk density, and pH. Evaluation of the PI model in Cascade County, MT, revealed a weak relationship between PI and small grain yield. Results indicate that model performance can be improved by addition of the content and location of organic matter and CaCO3 in the soil profile. Inclusion of cropping history further improves prediction.