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Plate 5. Relationship of particle-size distribution statistics and soil cation-exchange capacity (CEC) in (A) the USDA12 and (B) the ISSS systems. Note that (A) and (B) display only the fine earths with 10, 30, 50, and 70% clay intervals and sand from 0 to 90%. (C) The relationship of CEC with soil samples that contain rock separates are presented in the USDA5 trajectory system
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