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Custom Soil Resource Report <br /> Land Capability Classification—Arapaho-Roosevelt National Forest Area,Colorado,Parts of Boulder,Clear Creek,Gilpin, <br /> Grand,Park and Larimer Counties <br /> Map unit symbol and name Pct.of Component name Land Capability <br /> map unit Subclass <br /> Nonirrigat Irrigated <br /> ed <br /> 2705D—Ratake-Cathedral families-Rock <br /> outcrop complex,40 to 150 percent slopes <br /> 50 Ratake family — — <br /> 1 20 Cathedral family — — <br /> 15 Rock outcrop 8 — <br /> 2706D—Cypher family-Rock outcrop complex, <br /> 40 to 150 percent slopes <br /> 50 Rock o tc crop <br /> - - T — <br /> YP Y <br /> Soil Chemical Properties <br /> This folder contains a collection of tabular reports that present soil chemical <br /> properties. The reports (tables) include all selected map units and components for <br /> each map unit. Soil chemical properties are measured or inferred from direct <br /> observations in the field or laboratory. Examples of soil chemical properties include <br /> pH, cation exchange capacity, calcium carbonate, gypsum, and electrical <br /> conductivity. <br /> Chemical Soil Properties <br /> This table shows estimates of some chemical characteristics and features that <br /> affect soil behavior. These estimates are given for the layers of each soil in the <br /> survey area. The estimates are based on field observations and on test data for <br /> these and similar soils. <br /> Depth to the upper and lower boundaries of each layer is indicated. <br /> Cation-exchange capacity is the total amount of extractable cations that can be held <br /> by the soil, expressed in terms of milliequivalents per 100 grams of soil at neutrality <br /> (pH 7.0)or at some other stated pH value. Soils having a low cation-exchange <br /> capacity hold fewer cations and may require more frequent applications of fertilizer <br /> than soils having a high cation-exchange capacity. The ability to retain cations <br /> reduces the hazard of ground-water pollution. <br /> Effective cation-exchange capacity refers to the sum of extractable cations plus <br /> aluminum expressed in terms of milliequivalents per 100 grams of soil. It is <br /> determined for soils that have pH of less than 5.5. <br /> Soil reaction is a measure of acidity or alkalinity. It is important in selecting crops <br /> and other plants, in evaluating soil amendments for fertility and stabilization, and in <br /> determining the risk of corrosion. <br /> 20 <br />