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On-Farm Assessment of Soil Quality in California's Central Valley

^a USDA-ARS, Natl. Soil Tilth Lab., Ames, IA 50011
^b Dep. of Vegetable Crops and Weed Sci., Univ. of California, Davis, CA 95616
^c Dep. of Soils and Biogeochem., Univ. of California, Davis, CA 95616
^d Dep. of Crop Prod., Univ. of Tuscia, 01100, Viterbo, Italy
^e Univ. of California Coop. Ext., 1720 S. Maple Ave., Fresno, CA 93702

View larger version (21K): [in a new window]   Fig. 1. The scoring functions used to transform the measured indicator values into performance-based scores for the soil quality index (SQI) where the y-axis represents soil quality value (or performance of soil function) and the x-axis is the site-dependent expected range for each indicator.

View larger version (36K): [in a new window]   Fig. 2. Soil quality index (SQI) results for management comparisons at Farm 7 in 1998. Stacked bars show the component (scored and weighted) indicator means added to derive the overall index values. Error bars denote standard deviation of overall index values. Significant differences between treatments are denoted by different letters at = 0.10. BD, bulk density; WSA, water-stable aggregates; EC, electrical conductivity; SOM, soil organic matter.