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Range Production (Favorable Year)— Summary by Map Unit — La Plata County Area, Colorado <br />Map unit symbol <br />Map unit name <br />Rating (pounds per <br />acre per year) <br />Acres in A01 <br />Percent of AOI <br />46 <br />Nordicol very stony sandy loam, 6 to 25 <br />percent slopes <br />208.5 <br />19.8% <br />49 <br />Pastorius cobbly loam <br />2000 <br />41.9 <br />4.0% <br />50 <br />Pescar fine sandy loam <br />3750 <br />8.5 <br />0.8% <br />57 <br />Riverwash <br />11.4 <br />1.1% <br />71 <br />Valto -Rock outcrop complex, 12 to 65 <br />percent slopes <br />92.9 <br />8.8% <br />Subtotals for Soil Survey Area <br />527.6 <br />50.1% <br />Totals for Area of Interest <br />1,052.7 <br />100.0% <br />• <br />• <br />• <br />Custom Soil Resource Report <br />Rating Options —Range Production (Favorable Year) <br />Units of Measure: pounds per acre per year <br />Aggregation Method: Weighted Average <br />Component Percent Cutoff: None Specified <br />Tie -break Rule: Higher <br />Interpret Nulls as Zero: Yes <br />Range Production (Normal Year) <br />Total range production is the amount of vegetation that can be expected to grow <br />annually in a well managed area that is supporting the potential natural plant <br />community. It includes all vegetation, whether or not it is palatable to grazing animals. <br />It includes the current year's growth of leaves, twigs, and fruits of woody plants. It does <br />not include the increase in stem diameter of trees and shrubs. It is expressed in pounds <br />per acre of air -dry vegetation. In a normal year, growing conditions are about average. <br />Yields are adjusted to a common percent of air -dry moisture content. <br />In areas that have similar climate and topography, differences in the kind and amount <br />of vegetation produced on rangeland are closely related to the kind of soil. Effective <br />management is based on the relationship between the soils and vegetation and water. <br />62 <br />