This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...of a protecting granular surface mulch, it loses moisture rapidly through evaporation. The soil is relatively high in organic matter. In places it contains small amounts of gritty material. The subsoil is compact, brown to gray in color, heavy in texture, and contains much lime. In many places lime occurs as ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...of a protecting granular surface mulch, it loses moisture rapidly through evaporation. The soil is relatively high in organic matter. In places it contains small amounts of gritty material. The subsoil is compact, brown to gray in color, heavy in texture, and contains much lime. In many places lime occurs as conspicuous marly concentrations in seams, streaks, or pockets and as lenses and nodules. The substratum, usually extending to a depth of many feet is similar in most respects to the subsoil, but may consist of layers of clay, silt, and gravel. The Montezuma clay loam adobe is very much like the clay adobe, except in its slightly lighter texture. The adobe structure normally is less pronounced, and as a whole the structure is more friable and the soil easier to till. It is slightly less sticky when wet than the clay adobe and absorbs water more readily. It apparently contains somewhat less organic matter than the heavier soil. Some variations are noted in the soils of this group. These occur in most cases near the margin of the soil areas. In a few places the soil is brown, the subsoil contains little lime, and the type resembles the Ramona and Antioch soils, into which they merge in places. Near areas of recent alluvial soils, the group includes small areas cf the Dublin clay loam and clay, while near the mountains the subsoil of a few areas differs from typical in containing quantities of gravel and being rather gritty. Location.--The Montezuma adobe soils are most extensive in the western part of the survey near the coast. The largest area, consisting mainly of the clay adobe, extends from the southern part of Nigger Slough northwest to Inglewood. Smaller areas of the clay adobe are situated north of the San Pedro Hills, near Howard Summit, and north...
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