24 



CIRCULAR 870, U. S. DEPARTMENT OF AGRICULTURE 



SWALE 

 1 GENTLE SLOPE 

 H OPEN, ROLLING SLOPE 



ROCKY BRUSHY, ROLLING SLOPE 

 Ulil ROCKY BRUSHY, STEEP SLOPE 

 STEEP ROCKY BLUFFS 



Figure 12. — Map showing different kinds of land (site classes) in pastures 1 to 6. 



Table 5. — Pasture size, productivity, degree of grazing, and grazing capacity 



on six pastures 



Range 

 pasture 

 number 



3 

 1 

 5 



4 

 6 



2 



Size 



Acres 

 155 



154 



250 



309 



316 



230 



Productivity 



Swale-acres 

 43 



60 



68 

 78 

 89 

 90 



Degree of 



grazing 



obtained 2 



Close 



Moderate to close. 



Moderate 



Light to moderate 

 Light 



_.__do___ 



Grazing 

 capacity < 



Animal units 

 12.3 



17.1 



19.4 



22.3 



25.4 



25.7 



1 Sum of the acreages of all site classes in the pasture after the acreage of each site 

 class had been reduced to its swale-equivalent in herbage production; based on relative 

 herbage yields shown in table 4. 



2 11-year average obtained when each pasture was stocked with approximately 

 19 animal units for an average grazing season of 6 months. 



3 The number of animal units that the pasture would support for 6 months under 

 moderate grazing. 



