UNI101Y1 Chapter Notes - Chapter 4: Cation-Exchange Capacity, Soil Horizon, Soil Fertility
16 Feb 2013
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In arid regions, parent material breaks down slowly and plants add little organic detritus. Where decomposed bedrock and detritus erode as rapidly as they form. On alluvial deposits where fresh layers of silt deposited each year by floodwaters bury older material. Formation proceeds rapidly in parts of the humid tropics where chemical alteration of parent material may extend to depths of 100m. Most soils of temperate zones are intermediate in depth (1m) Wweeaatthheerriinngg is the physical and chemical alteration of rock material near the earth"s surface. The repeated freezing and thawing of water in crevices breaks rock into smaller pieces, exposing a greater surface area to chemical action initial chemical alteration occurs when water dissolves soluble nacl and caso4. Granite made up of feldspar, mica, and quartz (minerals) Consists various combinations of oxides of al3+, fe2+, si4+, mg2+, ca2+, k+, and other less abundant compounds.
