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Fig. 6. Soil management assessment framework (SMAF) outcomes for the four case studies including ANOVA and Student's t results: (a) Natural Resources Inventory (NRI) data for all land uses and soil types; (b) NRI cropped Xerolls only, grouped by tillage type and cropping system; (c) Iowa (IA) data grouped by watershed (WS) or tillage type and sampling year; (d) California (CA) data grouped by vegetable production system (org = organic; low = low input; conv 4 = 4-yr conventional rotation; conv 2 = 2-yr conventional rotation); and (e) Georgia (GA) data grouped by site (or soil order) and amendment treatment (trt). Treatments or land uses labeled with different letters are significantly different at 
= 0.05. Error bars represent one standard deviation from the mean.
