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CIKCULAE, 17 8, U. S. DEPARTMENT OF AGEICULTUE-E 



farther north with even a smaller amount. It is impractical, be- 

 cause of cost, to give such soil treatment on range lands, although 

 such measures should be taken advantage of in seeding abandoned 

 dry farm lands to range plants. 



Even with IT inches of precipitation, properly distributed, only 

 the more favorable sites where the soil remains fairly moist most of 

 the growing season should be chosen. Such localities include moun- 

 tain meadows that are irrigated by run-off from surrounding terri- 



FiGDRE 1. — Approximate precipitation in the western part of the United States. 

 (Hatched areas represent national forests) 



tory, fairly level parks protected against high winds and excessive 

 evaporation, moderate north slopes having a fairly deep, fine-textured 

 soil, and any other sites that do not dry out readily. Areas to be 

 avoided are steep slopes ; slopes exposed much of the day to the sun 

 or to the prevailing wind ; areas of coarse, loose, or shallow soils or 

 soils low in organic matter ; and sites where other conditions are un- 

 favorable for the retention of moisture in the soil. 



