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Organic matter as a factor in classification of the soils of dry regions
- Shaw, C.F.
- Agronomy journal 1932 v.24 no.7 pp. 565-577
- soil classification, arid zones, soil color, soil depth, nitrogen content, soil pH, soil water content, soil parent materials, altitude, rain, air temperature, climatic zones, vegetation, soil organic matter, textural soil types, humus, California
- We must conclude from these studies that the organic matter content is not dominant in determining the color of the soils in regions of periodic precipitation with hot dry summers and cool moist winters, and that it occupies a very minor place in determining the characteristics of soil profiles. Of much more importance in profile development, and consequently to soil classification, are the mineralogical composition of the parent material, the degree of oxidation of the metals, especially iron, the intensity and duration of leaching, and the extent of downward migration and subsoil accumulation of colloidal clays and cementing materials.