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Predicting Cation Exchange Capacity for Soil Survey Using Linear Models

USDA-NRCS, National Soil Survey Center, 100 Centennial Mall North, Federal Building, Room 152, Lincoln, NE 68508

View larger version (40K): [in a new window]   Fig. 1. A decision tree selects which cation exchange capacity (CEC) predictive model should be used for a soil layer, based on soil pH (in water), organic carbon content, and taxonomic soil classification. The equation numbers are referring to those in Table 1. ECEC, effective cation exchange capacity.

View larger version (25K): [in a new window]   Fig. 2. A scatter plot of the measured vs. predicted cation exchange capacity (CEC) of 793 horizons from 150 pedons from across the United States.