APPENDIX D 



Subclass (s) is made up of soils where root zone limitations are 

 the dominant hazard or limitation in their use. Soils in this subclass 

 have such limitations as shallow depth, stoniness, low moisture-holding 

 capacity or slow permeability. 



Subclass (c) climate limitations is made up of soils where climate 

 (temperature and/or lack of moisture) is the only major hazard limiting 

 their use. Much of Montana has a growing season of less than 120 days 

 and the annual rainfall over much of the state is less than 15 inches 

 at elevations below 5,000 feet. 



Limitations imposed by erosion, excess water, shallow soils, stones 

 or low moisture-holding capacity can be modified or partially overcome 

 and will take precedence over climate in determining subclasses. The 

 dominant kind of limitation or hazard to the use of the land determines 

 the assignment of capability units to the e, w, s and c subclasses. 



Where two kinds of limitation which can be modified or corrected 

 are essentially equal, the subclasses have the following priority: e, 

 w, s, c. For example, there is a need to group a few soils that have 

 both an erosion hazard and an excess water hazard, with these two 

 limitations being equal, (e) takes precedence over the (w), soils 

 having brth an excess water limitation and a root zone limitation 

 the (w) takes precedence over the (s), etc. 



168 



