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Custom Soil Resource Report <br />Breast height <br />An average height of 4.5 feet above the ground surface; the point on a tree where <br />diameter measurements are ordinarily taken. <br />Brush management <br />Use of mechanical, chemical, or biological methods to make conditions favorable <br />for reseeding or to reduce or eliminate competition from woody vegetation and <br />thus allow understory grasses and forbs to recover. Brush management increases <br />forage production and thus reduces the hazard of erosion. It can improve the <br />habitat for some species of wildlife. <br />Butte <br />An isolated, generally flat-topped hill or mountain with relatively steep slopes and <br />talus or precipitous cliffs and characterized by summit width that is less than the <br />height of bounding escarpments; commonly topped by a caprock of resistant <br />material and representing an erosion remnant carved from flat -lying rocks. <br />Cable yarding <br />A method of moving felled trees to a nearby central area for transport to a <br />processing facility. Most cable yarding systems involve use of a drum, a pole, and <br />wire cables in an arrangement similar to that of a rod and reel used for fishing. To <br />reduce friction and soil disturbance, felled trees generally are reeled in while one <br />end is lifted or the entire log is suspended. <br />Calcareous soil <br />A soil containing enough calcium carbonate (commonly combined with <br />magnesium carbonate) to effervesce visibly when treated with cold, dilute <br />hydrochloric acid. <br />Caliche <br />A general term for a prominent zone of secondary carbonate accumulation in <br />surficial materials in warm, subhumid to and areas. Caliche is formed by both <br />geologic and pedologic processes. Finely crystalline calcium carbonate forms a <br />nearly continuous surface -coating and void -filling medium in geologic (parent) <br />materials. Cementation ranges from weak in nonindurated forms to very strong in <br />indurated forms. Other minerals (e.g., carbonates, silicate, and sulfate) may occur <br />as accessory cements. Most petrocalcic horizons and some calcic horizons are <br />caliche. <br />California bearing ratio (CBR) <br />The load -supporting capacity of a soil as compared to that of standard crushed <br />limestone, expressed as a ratio. First standardized in California. A soil having a <br />CBR of 16 supports 16 percent of the load that would be supported by standard <br />crushed limestone, per unit area, with the same degree of distortion. <br />Canopy <br />The leafy crown of trees or shrubs. (See Crown.) <br />22 <br />