ranges according to Forest Service standards 
and criteria.° 
4. Soils were rated as to their probable or 
expected response or suitability to a number of 
desired cultural or management practices. 
a. Practices considered were: Potential 
fertilizer response; suitability for terracing, 
pitting, water impoundments, plowing and 
seeding, and deep furrow drilling; and proba- 
ble response to plant control, interseeding, and 
intensive management systems. 
b. Ratings and recommendations for these 
practices were tabulated by soil mapping units. 
The ratings and recommendations for each 
unit were explained in notes appended to the 
table. 
HOW THE MODEL HAS BEEN USED 
The range analysis showed a large acreage 
of secondary range in good condition on the 
Cow Creek Allotment. A portion of the second- 
ary range was on soils with a high production 
potential and with a relatively low erosion haz- 
ard. This part of the secondary range can be 
safely developed into primary range. Another 
part of the secondary range was occupied by 
°Standards and criteria for range condition and 
trend classes and for primary and secondary range are 
given in FSH 2209.21 R1, Range Environmental Anal- 
ysis Handbook. 
220 
low-producing soils with very high erosion 
hazards. This part should not be converted into 
primary range. 
The proper location of fences has been fa- 
cilitated. The allotment management plan called 
for an intensive management system with sev- 
eral pastures. As originally planned, one pas- 
ture cross-fence would have intersected the 
boundary fence on a soil with a very high ero- 
sion hazard. Because livestock often congregate 
in fence corners, sorespots would probably de- 
velop soon. The fence location was changed so 
that the intersection was on soils with a much 
lower erosion hazard. 
The model has also been used to estimate 
probable response of an area to sagebrush con- 
trol by herbicides. Potential productions of pa- 
latable forage were estimated, and likely prob- 
lem areas were pinpointed. 
SUMMARY 
A model has been developed to integrate 
data from soil surveys and range allotment 
analyses into a simple, useful tool for planning 
by the resource manager. The method consists 
of classifying soils into production and poten- 
tial erosion hazard classes, mapping ranges by 
condition classes, and classifying them as pri- 
mary or secondary range. Soil mapping units 
are then rated as to probable response to cer- 
tain cultural and management practices. 
yy U.S. GOVERNMENT PRINTING OFFICE: 1970 O0—356-352 
