Performance is as good as that of soils that do not have the limitations or even better. For other soils and uses, however, no corrective measures are available at an acceptable cost. For many situations, practices may substantially lessen the effects of soil properties, but problems still remain. To express soil potentials numerically, values are assigned to those soil properties and site conditions that influence performance. Some approaches assign penalty points to limiting soil properties or site conditions, and others assign points based on favorable properties or conditions.
CM is an index of cost of the needed corrective measures.
Finally, CL is an index of the extent to which the feasible corrective measures are not fully successful. It reflects costs for annual or periodic maintenance, for inconvenience or aggravation, or for substandard yield. Alternatively, qualitative ratings of soil potential may be employed. The soil has few limitations, or practices for overcoming the limitations are available at a reasonable cost. Crop production is profitable and at least average for the area.