Describe one way that soil is used by humans Bell Work.
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Describe one way that soil is used by humans
Bell Work
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{
Soil Purposes and Land Capability Classes
Soil Science and Management, Sixth Edition.Edward J. Plaster, Delmar Cengage Learning
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Describe one way that soil is used by humans
Discussion
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Soil use can be broken into two categories Agricultural Nonagricultural
Uses of Soil
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Cropland Annual Crops Perennial Crops
Can be an erosion issue
Agricultural Uses - Cropland
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Rangeland – Native grass and shrubs
Vast quantities needed for adequate grazing land
Management
Agricultural Uses - Grazing
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Agroforestry (Silviculture) Least destructive to the soil, but there are still concerns What are these concerns?
Agricultural Uses - Forest
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Huge trend, especially in urban centers
Small scale farms, in the middle of the city Highly Intensive Soil must be taken care of
Agricultural Uses – Urban Agriculture
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Parks, Ball Fields, Golf Courses, etc Turfgrass Management
Natural Resources Hunting Fishing
Non-Agricultural Uses - Recreation
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Soil must support whatever we put on it Leaning Tower of Pisa
Load-bearing Capacity Shrink-Swell Potential
Non-Agricultural Uses - Construction
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Landfills Environmental issue
Soil used as a filter Leaching
Non-Agricultural Uses – Waste Disposal
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24%
8%8
%3%
2%
27%
24%Rangeland PasturelandUrban Land Other LandConservation Reserve Land
Forestland
Cropland
Land Use in the USA – 2007, Soil Science and Management
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There are 8 Land Capability Classes as set by the NRCS
I = least restricted VIII = most restricted
Land Capability Classes
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Can be: Cropped Pastured Managed for Woodlands and
Wildlife Good water-holding capacity Relatively flat and well drained Best cropland
Class I
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Gentle Slopes (2%-6%) Moderate erosion hazards Shallow topsoil Slightly poor drainage Suitable for all uses
Class II
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Moderately steep slopes (6%-12%)
High erosion hazards Poor drainage Very Shallow Topsoil Unstable Structure Special conservation methods
are needed for growing crops
Class III
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Row crops cannot be grown
Slopes (12%-18%) Cover crops are best Erosion controls MUST be practiced
Class IV
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Unsuitable for cultivation Can be used for range, pastureland, woodlands, recreation
Limited by: flooding, rockiness, short growing season
Class V
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Same as Class V Steep slope (18%-30%)
Class VI
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Relatively unsuitable for production
Preserved only for recreation, wildlife or beauty
Examples: Sandy beaches, rock outcroppings, flooded river bottomsClass VII and Class
VIII
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What are the five soil forming factors, excluding humans?
Exit Slip