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cations) is base saturated with a predominance of calcium even though there is no free calcium or <br />• ma~ncsium carbonate in the solum (A and B2t horizons) or in at least the upper part of the C horizon. <br />No evidence o(deGciencies of any of the essential plant nutrients L apparent. <br />Natural fertility is slightly below normal (or the area. Low organic matter levels seem to be indicative of <br />low nitrogen levels. This would probably indicate low soil moisture which prevents heavy vegetative cover. <br />Phosphorus also is deficient according to indicated soil analysis (see Exhibit 26). Reclamation programs <br />will be enhanced greatly by supplemental fertilization including both nitrogen and phosphorus in early <br />stages of plant growth. <br />There is no es~dence of detrimental accumulation of sodium or other soluble salts in the soils of this unit. <br />t\tappinc Unit Number 20 - Moderately deep (20 to 4(1 inches to bedrock) and deep (more than 40 <br />inches to bedrock), dark colored, from poor to poorly drained soils having thick surface horizons (A <br />horizons) and mottled subsurface horizons (B2t horizons) of low chroma occurring in parrs of the stud}' <br />area in which the mean summer soil temperatures (June, July, and August mean temperature measured at <br />ZO inches) is 55°F or higher. <br />Classification of Major Components -The components listed below comprise the major part of the <br />mapping unit <br />A. Cumulic Haplaquoll (Humic-Glei Soils). <br />1. Fine-loamy, mixed, mesic. <br />(McClave Series) <br />2. Fine-loamy, mixed, frigid. <br />(Marshdale Series) <br />• B. Typic Haplaquoll (Humic•Glei Soils). <br />1. Fine-loamy, mixed, mesic. <br />(Broomfield Series) <br />2. Fine-loamy, mixed, frigid. <br />(Yampa Series) <br />Extent and 1`4aior Areas of Occurrence - Mapping unit number 20 has a small total acreage. It occurs on <br />the Iloodplain of the Dry Fork of Minnesota Creek or its tributaries and is associated with beaver activity. <br />Ch;tracteristic Tono~ranhv -These soils occur in nearly level to very gently concave por[ions of Ilood- <br />plains. Drainage has been restricted by beaver dams. <br />Physical Pronerties - Because of their nearly constantly saturated condition, measurement of physical <br />properties must be interpreted in light of their natural state. <br />It would be nearly impossible to handle the soils of this unit at any condition other than near saturation. <br />In consequence, irreversible puddling with complete loss of favorable structure cannot be avoided. The <br />degree to which favorable aeration and permeability could be restored to dried materials after relocation is <br />not known, but since these materials arc not highly organic it is probable that it would be a difficult task. <br />Chemical Pronerties and General Fertili« • - Chemically these soils are not abnormal. Organic matter <br />content is higher than normal in the surface horizon due to the absence of good aeration essential to <br />bacteriological breakdown. <br />• Thcsc soils arc neutral to mildly alkaline and ihe}~ do not have detrimental accumulations otsodium or <br />other soluble salts. <br />