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14—Colby loam, 0 to 1 percent slopes. This is a deep,
well drained soil on uplands at elevations of 4,850 to 5,050
• feet. It formed in calcareous eolian deposits.
Typically the surface layer is pale brown loam about 12
inches thick. The underlying material to a depth of 60
inches is very pale brown silt loam.
Permeability is moderate. Available water capacity is
1 high. The effective rooting depth is 60 inches or more.
- Surface runoff is slow, and the erosion hazard is low.
- This soil is used almost entirely for irrigated crops. It
is suited to all crops commonly grown in the area includ-
Sog IS
ing corn, sugar beets, beans, alfalfa, small grain,
It t p o r potatotes, and onions. An example of a suitable cropping
D^ system is 3 to 4 years of alfalfa followed by corn, corn for
/i C S silage, sugar beets, small grain, or beans. Few conserva-
k tion practices are needed to maintain top yields.
pen IAAll methods of irrigation are suitable, but furrow ir-
7 7� t= I rigation is the most common. Barnyard manure and com-
76 mercial fertilizer are needed for top yields.
1 ;a Windbreaks and environmental plantings of trees and
shrubs commonly grown in they area are generally well
' „76 suited to this soil. Cultivation to control competing
' ` a e vegetation should be continued for as many years as
-} possible following planting. Trees that are best suited and
l1 l (. ; c- have good survival are Rocky Mountain juniper, eastern
' Y4101-11-171r.-17/-Hr
' , =a t 9 ' redcedar, ponderosa pine,'Siberian elm, Russian-olive, and
14 t# 31 hackberry. The shrubs best suited are skunkbush sumac,
E , 9 lilac, Siberian peashrub, and American plum.
' w 17 Openland wildlife, such as pheasant, mourning dove,
`, 4-6 and cottontail, are best suited to this soil. Wildlife habitat
i
1 ;, development, including tree and shrub plantings and
( ? , r rtr grass plantings to serve as nesting areas, should be suc-
3 ��+ , w e 60 cessful without irrigation during most years. Under ir-
b Din' rigation, good wildlife habitat can be established, benefit-
lucerne , ilti_
6 > ing many kinds of openland wildlife.
\�l{ « 76 This soil has good potential for urban and recreational
developments. Road design can be modified to compen-
r
� e,�, � �, ' sate for the limited capacity of this soil to support a load.
e ( 39 Capability class I irrigated.
15 15—Colby loam, 1 to 3 percent slopes. This is a deep,
14 ,a. , a °`!I well drained soil on uplands at elevations of 4,850 to 5,050
` � m� feet. It formed in calcareous eolian deposits.
- ® 1 52 ` Typically the surface layer is pale brown loam about 12
-
inches thick. The underlying material is very pale brown
c 1 silt loam to a depth of 60 inches.
> ¶ 39, Permeability is moderate. Available water capacity is
-' ' 31 e
1-Ski ,. , { ' high. The effective rooting depth is 60 inches or more.
Surface runoff is medium, and the erosion hazard is
i •`- moderate.
• ` . � i ( In irrigated areas this soil is suited to all crops corn6,1
-
s-
&H'' monly grown in the area, including corn, sugar beets,
' 2008-0097 beans, alfalfa, small grain, potatoes, and onions. An exam-
P „S! '" ple of a suitable cropping system is 3 to 4 years of alfalfa
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