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Productivity index model comparison for selected soils in North Central United States


, : Productivity index model comparison for selected soils in North Central United States. Journal of Soil and Water Conservation 47(6): 491-494

The productivity index (PI) model is a derived measure of soil productivity. The basic assumption of the model is that crop yield is a function of root development, which in turn is controlled by the soil environment. The PI model in conjunction with estimated soil property values contained in the SCS Soil Interpretation Record (SIR) database are the basis of formulating predictions of long-term productivity changes by soil erosion in soil series.

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Related references

Anonymous, 1965: Productivity of soils in the north central region of the United States

Chapman, Stanley, L., 1971: Quartz, vermiculite, and montmorillonite determination, and clay mineralogy of selected soils from the north central United States

Sharpley, A.; Smith, S.1; Reed, L., 1983: Selected properties of paired virgin and cultivated soils from major land resource areas Nutrient cycling in soils, models, evaluation, Erosion Productivity Impact Calculator, United States. Technical bulletin T Oklahoma Agricultural Experiment Station: 83 (T-159)

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Franzmeier, D.P.; Lemme, G.D.; Miles, R.J., 1985: Organic carbon in soils of north central United States. Organic carbon contents in the upper 0.2 m and upper 1.0 m of soils in the 12-state North Central Region are presented in this study with tables and maps. The information was summarized by pedologists in each state from laboratory analyses of pedo...

Labaugh, James W., 1995: Relation of algal biovolume to chlorophyll a in selected lakes and wetlands in the north-central United States. Algal chlorophyll a is commonly used as a surrogate for algal biomass. Data from three lakes in western Nebraska, five wetlands in north-central North Dakota, and two takes in north-central Minnesota represented a range in algal biovolume of over...

Mokma, D.L.; Fenton, T.E.; Olson, K.R., 1996: Effect of erosion on morphology and classification of soils in the North Central United States. The effects of erosion on morphology and classification of five Alfisols and nine Mollisols in north central USA were determined. Horizon thickness and solum thickness decreased with increasing amounts of erosion. Transitional horizons between Ap...

Grigal, D.F.; Brovold, S.L.; Nord, W.S.; Ohmann, L.F., 1989: Bulk density of surface soils and peat in the North Central United States. Relationships between bulk density (BD) and loss on ignition (LOI) for forest floor, shallow mineral soil (0-25 cm depth), and peat were described by exponential functions. The data were collected in forests across the North Central US. For forest...

Sarma, V.A., 1964: Mineralogy of some soils of north central United States in relation to their potassium release properties. Abstract of thesis from University of Wisconsin. Unfertilized silt-loam subsoil which released 449 Ib/acre K on oven-drying showed a higher proportion and crystallinity of expansible layer silicates than did its surface soil which released only 45...

Milford, M.H., 1962: Mineralogical analyses of some soils from the north central United States in relation to potassium availability. For soils whose available K supply was under cropping & leaching stress, the amount of exposed illite edge surface was closely related to K availability.