問題一覧
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soils and land Forms have limitations that preclude their use for commercial plant production.
Class VIII
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IS EXPRESSED AS A QUANTITY PER UNIT AREA AND TIME AND OFTEN APPLIES TO SMALL PLOTS
SOIL LOSS
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REPRESENTS SOIL LOSS DEPENDENT ON SLOPE STEEPNESS AND LENGTH. THE STEEPER AND LONGER THE SLOPE, THE GREATER THE RISK OF SOIL EROSION.
LS factor
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have some limitations that reduce the choice of plants or require moderate conservation practices
Class Il soils
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IS PRIMARILY INFLUENCED BY SOIL TEXTURE, BUT IT CAN ALSO BE IMPACTED BY STRUCTURE, ORGANIC MATTER, AND PERMEABILITY.
K factor
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have very severe limitations that restrict the choice of plants and or require very careful management
Class IV soils
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is a worldwide phenomenon leading to loss of nutrient rich surface soil, increased runoff from more impermeable subsoil and decreased water availability to plants
Degradation of agricultural land by soil erosion
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V factor
the vegetative cover Factor
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I factor
soil erodibility index
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have severe limitations that reduce the choice of plants or require special conservation practices
Class III Soils
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aims to identify those areas of land where the maximum sustained productivity From a given land use
Erosion hazard assessment
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is defined as the lowering of the soil's capacity to support human life.It is also described as the destruction and deterioration of the physical, chemical, and biological properties of the soil
Soil degradation
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2
wetness by poor drainage
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is useful for determining conservation measures' adequacy in farm planning and predicting non-point sediment losses.
The Universal Soil Loss Equation
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REPRESENTS HOW AN AGRICULTURAL SUPPORT PRACTICE WILL AFFECT SOIL LOSS.
P factor
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5
Fine or very fine texture
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C factor
climatic factor
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3
slow permeability
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IS THE SOIL ERODIBILITY FACTOR.
K factor
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S stands for
ROOTING ZONE LIMITATIONS (SHALLOW OR DROUGHTY)
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USLE FACTORS
R, K, LS, C, P
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K factor
soil surface roughness factor
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IS THE FLOW OF WATER ON THE GROUND WHEN IT CANNOT RAPIDLY INFILTRATE THE SOIL
RUNOFF
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6
salts or alkali
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COMBINES SOIL LOSS FROM A SPECIFIC CROP AND SOIL LOSS FROM A SPECIFIC LAND MANAGEMENT TECHNIQUE
C factor
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C stands for
CLIMATIC LIMITATION
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This method of estimating soil loss was developed from 1945 to 1965 based on statistical analyses of field plot data from small plots in many states in the U.S.
The Universal Soil Loss Equation
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0
sand and gravel in sub-stratum
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REPRESENTS THE EROSION POTENTIAL, BASED ON THE RAINFALL AND RUNOFF BY GEOGRAPHIC LOCATION.
R factor
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8
hard pan or near impervious bedrock
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E stands for
EROSION
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soils have few limitation restricting their use.
Class I soils
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REFERS TO THE AMOUNT OF ERODED MATERIAL THAT PASSES A DESIGNATED POINT AT THE OUTFLOW END OF A PLOT, FIELD. CHANNEL, OR WATERSHED
SEDIMENT YIELD
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is the portion of rainfall that makes its way toward stream channels, lakes, or oceans as surface or subsurface Flow. However, runoff usually refers to overland or surface Flow
Runoff
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FACTORS AFFECTING RUN-OFF
PRECIPITATION, WATERSHED FACTORS, TOPOGRAPHIC FEATURES, VEGETATION AND MANAGEMENT PRACTICES
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7
cobblestone, stone or rock
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L factor
the unsheltered distance
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1
erosion hazard
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SUB-CLASSES
E, W, S, C
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9
low fertility or toxicity
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have severe limitations that make them generally unsuited to cultivation and limit their use largerly to pasture or range woodland, or wildlife food cover.
Class VI soils
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have few or no erosion hazards but have other limitations impracticable to remove, that restrict their use to pasture or range, woodland, or wildlife Food cover
Class V soils
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4
coarse textured or excess gravel
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was developed by the United States Natural Resources Conservation Service as a method of assessing the extent to which limitations such as erosion, soil depth, wetness and climate hinder the agricultural use that can be made of the land.
Land capability classification
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have very severe limitations that make them unsuited to cultivation and also, restrict their use largely to grazing, woodland or wildlife
Class VII soils
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W stands for
WETNESS, DRAINAGE OR OVERFLOW