The Storie index is a method of soil rating based on soil characteristics that govern the land's potential utilization and productivity capacity. Developed by R. Earl Storie at University of California Berkley in the 1930s as a method of land valuation, it is independent of other physical or economic factors that might determine the desirability of growing certain plants in a given location. The Storie index is a method of soil rating based on soil characteristics that govern the land's potential utilization and productivity capacity. Developed by R. Earl Storie at University of California Berkley in the 1930s as a method of land valuation, it is independent of other physical or economic factors that might determine the desirability of growing certain plants in a given location.