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Custom Soil Resource Report <br /> Rangeland Productivity and Plant Composition-Weld County,Colorado,Southern Part <br /> Map unit symbol and soil name Ecological site Total dry-weight production Characteristic vegetation Rangeland <br /> composition <br /> Favorable year Normal year Unfavorable <br /> year <br /> Lb/ac Lb/ac Lb/ac Pct <br /> 1—Altvan loam,0 to 1 percent <br /> slopes <br /> Altvan Loamy Plains 1,600 900 400 Needleandthread 125 <br /> Western wheatgrass 20 <br /> Prairie sandreed 15 <br /> Blue grama — <br /> 2—Altvan loam,1 to 3 percent <br /> slopes <br /> Altvan Loamy Plains 1,600 900 400 Needleandthread i 25 <br /> Western wheatgrass 20 <br /> v <br /> N Prairie sandreed 15 <br /> Blue grama — <br /> 3—Aquolls and Aquents,gravelly <br /> substratum <br /> -1 <br /> Aquolls Salt Meadow 2,600 1,900 1,400 Western wheatgrass 25 <br /> Plains bluegrass 10 <br /> Switchgrass 10 <br /> Miscellaneous perennial grasses 5 <br /> Rush 15 — <br /> Alkali sacaton — <br /> Aquents,gravelly substratum Salt Meadow 3,000� 2,500� 1,000 Switchgrass 15 <br /> Western wheatgrass T15 <br /> Alkali sacaton - <br /> 10—Ellicott-Ellicott sandy-skeletal <br /> complex,0 to 3 percent slopes, <br /> rarely flooded <br />