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found in semiarid to moist areas Come from leached clay minerals make up 10% of of worlds surface
(Name the soil order) |
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- high water and nutrient holding capacity
- found in cool areas with moderate precipitation especially near volcanic materials
- highly productive soils
-make up 1% of world
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- lack of moisture restricts rapid weathering
- common in deserts of the world
-accumulates gypsum, salt and calcium carbonate (which are easily leached from soils)
- make up 12% of world
(name the soil order) |
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- little or no evidence of horizon development
- occur in areas where parent material had been recently deposited or where erosion is faster than soil development.
- have ochric epipedon
-make up 8% of world
-examples are dunes, or floodplains
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- have permafrost near soil surface
-common in higher latitudes and elevations
- make up 9% of world soil
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- high organic matter content
- saturated year-round
- form in decomposed plants that accumulate more than they decay
-make up 1% of worlds soils
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-from semi-arid and humid environments
-moderate weathering and development
- Lack of development due to erosion, resistant PM, or recent deposition
- make up 9% of the worlds soils
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-high organic matter in upper horizons
-very fertile
- form under grass from climates that have moderate seasonal moisture deficit
- make up 7% of the worlds soils
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- highly weathered soil from tropic to sub-tropic areas
-have indistinct horizons
- low activity minerals (ir kaolinite, quartz and iron oxides)
- low natural fertility and low ability to retain additions and fertilizer
- make up 8% of worlds soils
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- form form weathering process that strip organic matter
-commonly occur in areas course-textured deposits, forests and humid regions
-tend to be acidic and infertile
- make up 4% of the worlds soils
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- high leaching and weathering
leaving clay-enriched subsoil
- found in humid areas
-acid soils with nutrients found in top
few inches of soil
-make up 8% of worlds soils
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-high content of expanding clays
- swell when wet, transmit water slowly meaning slow leaching
-high in natural nutrients
- make up 2% of the worlds soils
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