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Questions and Answers
Which soil class is characterized by being unfit for cultivation and having severe limitations for pasture or forestry use?
Which soil class is characterized by being unfit for cultivation and having severe limitations for pasture or forestry use?
- Class VI (correct)
- Class VIII
- Class V
- Class VII
Which soil class is characterized by being very wet, usually found in small and nearly level drainageways, and not subject to erosion but having drainage problems and frequent flooding?
Which soil class is characterized by being very wet, usually found in small and nearly level drainageways, and not subject to erosion but having drainage problems and frequent flooding?
- Class V (correct)
- Class VIII
- Class VII
- Class VI
Which soil class is only suited for wildlife or recreation purposes and is usually extremely stony, sandy, or wet?
Which soil class is only suited for wildlife or recreation purposes and is usually extremely stony, sandy, or wet?
- Class V
- Class VII
- Class VIII (correct)
- Class VI
Which soil class requires extensive management of conservation practices to control erosion and has major hazards of severe erosion and/or slope?
Which soil class requires extensive management of conservation practices to control erosion and has major hazards of severe erosion and/or slope?
How is slope calculated?
How is slope calculated?
What does the term 'erosion' refer to in land evaluation?
What does the term 'erosion' refer to in land evaluation?
What is the surface texture of the topsoil determined by?
What is the surface texture of the topsoil determined by?
What does the term 'permeability of subsoil' refer to in land evaluation?
What does the term 'permeability of subsoil' refer to in land evaluation?
How many land capability classes are there?
How many land capability classes are there?
What does the classification of erosion depend on?
What does the classification of erosion depend on?
How is topsoil texture determined?
How is topsoil texture determined?
What does permeability rate measure?
What does permeability rate measure?
What does effective depth refer to?
What does effective depth refer to?
Which land capability class is very good for crop production with ideal soils and no restrictions?
Which land capability class is very good for crop production with ideal soils and no restrictions?
What are the two groups into which land capability classes are divided?
What are the two groups into which land capability classes are divided?
How many slope categories does Texas have?
How many slope categories does Texas have?
What does drainage influence after rainfall?
What does drainage influence after rainfall?
What does the classification of Class IV land indicate?
What does the classification of Class IV land indicate?
What is the classification of land capability classes with higher numbers?
What is the classification of land capability classes with higher numbers?
What influences the soil's tillability after rainfall?
What influences the soil's tillability after rainfall?
Class V soils are subject to severe erosion and slope hazards
Class V soils are subject to severe erosion and slope hazards
Class VI soils may be suitable for cultivation with extensive management of conservation practices
Class VI soils may be suitable for cultivation with extensive management of conservation practices
Class VII soils require extensive management of conservation practices to control erosion
Class VII soils require extensive management of conservation practices to control erosion
Class VIII soils are suitable for crop production with ideal soils and no restrictions
Class VIII soils are suitable for crop production with ideal soils and no restrictions
Is slope determined by estimating the number of feet the land rises or falls over 100 feet and expressed as a percent?
Is slope determined by estimating the number of feet the land rises or falls over 100 feet and expressed as a percent?
To calculate slope, you divide the amount of vertical change in elevation by the horizontal distance the change takes place over, and then multiply that number by 100 to get a percentage.
To calculate slope, you divide the amount of vertical change in elevation by the horizontal distance the change takes place over, and then multiply that number by 100 to get a percentage.
Erosion refers to a percentage of the original topsoil which has suffered the harmful effects of water and wind.
Erosion refers to a percentage of the original topsoil which has suffered the harmful effects of water and wind.
The permeability of subsoil refers to the ability of air and water to move through the subsoil.
The permeability of subsoil refers to the ability of air and water to move through the subsoil.
Land capability classes are divided into three groups for crop production, permanent vegetation, and wildlife habitat.
Land capability classes are divided into three groups for crop production, permanent vegetation, and wildlife habitat.
Class II land is very good for crop production, with ideal soils and no restrictions.
Class II land is very good for crop production, with ideal soils and no restrictions.
There are six slope categories in Texas, ranging from nearly level to very steep.
There are six slope categories in Texas, ranging from nearly level to very steep.
Erosion is classified based on the percentage of original topsoil remaining, ranging from none to slight, to very severe.
Erosion is classified based on the percentage of original topsoil remaining, ranging from none to slight, to very severe.
Permeability rates the movement of water or air through the soil as rapid, moderate, or slow, based on the topsoil type.
Permeability rates the movement of water or air through the soil as rapid, moderate, or slow, based on the topsoil type.
Class IV land is borderline cultivatable land with severe limitations.
Class IV land is borderline cultivatable land with severe limitations.
Topsoil texture is determined by the proportion of sand, silt, and clay, with fine, medium, and coarse textures having specific characteristics.
Topsoil texture is determined by the proportion of sand, silt, and clay, with fine, medium, and coarse textures having specific characteristics.
Drainage is categorized as excessive, well-drained, moderate, somewhat poor, poorly drained, or wet, influencing the soil's tillability after rainfall.
Drainage is categorized as excessive, well-drained, moderate, somewhat poor, poorly drained, or wet, influencing the soil's tillability after rainfall.
Effective depth refers to the depth to which plant roots can easily penetrate and is classified as deep, moderately deep, shallow, or very shallow.
Effective depth refers to the depth to which plant roots can easily penetrate and is classified as deep, moderately deep, shallow, or very shallow.
Land capability classes are a system designed to classify land based on its best use and are divided into two groups for crop production or permanent vegetation.
Land capability classes are a system designed to classify land based on its best use and are divided into two groups for crop production or permanent vegetation.
There are eight land capability classes, with higher numbers indicating less suitability for crop production.
There are eight land capability classes, with higher numbers indicating less suitability for crop production.
Class V-VIII are suited only for permanent vegetation as pasture or forest and have increasing limitations for crop production.
Class V-VIII are suited only for permanent vegetation as pasture or forest and have increasing limitations for crop production.
Study Notes
Soil Classification and Land Capability
- Slope categories are based on the percentage of elevation change over a given distance, with Texas having six categories ranging from nearly level to very steep.
- Erosion is classified as none to slight, moderate, severe, or very severe based on the percentage of original topsoil remaining.
- Topsoil texture is determined by the proportion of sand, silt, and clay, with fine, medium, and coarse textures having specific characteristics.
- Permeability rates the movement of water or air through the soil as rapid, moderate, or slow, based on the subsoil type.
- Drainage is categorized as excessive, well-drained, moderate, somewhat poor, poorly drained, or wet, influencing the soil's tillability after rainfall.
- Effective depth refers to the depth to which plant roots can easily penetrate and is classified as deep, moderately deep, shallow, or very shallow.
- Land capability classes are a system designed to classify land based on its best use and are divided into two groups for crop production or permanent vegetation.
- There are eight land capability classes, with higher numbers indicating less suitability for crop production.
- Class I land is very good for crop production, with ideal soils and no restrictions, while Class II has some limitations but is suitable for crop production.
- Class III may be used for crop production with certain conservation practices, and Class IV is borderline cultivatable land with severe limitations.
- Class V-VIII are suited only for permanent vegetation as pasture or forest and have increasing limitations for crop production.
- Each land capability class has specific characteristics related to slope, topsoil thickness, erosion, texture, permeability, drainage, and effective depth.
Soil Classification and Land Capability
- Slope categories are based on the percentage of elevation change over a given distance, with Texas having six categories ranging from nearly level to very steep.
- Erosion is classified as none to slight, moderate, severe, or very severe based on the percentage of original topsoil remaining.
- Topsoil texture is determined by the proportion of sand, silt, and clay, with fine, medium, and coarse textures having specific characteristics.
- Permeability rates the movement of water or air through the soil as rapid, moderate, or slow, based on the subsoil type.
- Drainage is categorized as excessive, well-drained, moderate, somewhat poor, poorly drained, or wet, influencing the soil's tillability after rainfall.
- Effective depth refers to the depth to which plant roots can easily penetrate and is classified as deep, moderately deep, shallow, or very shallow.
- Land capability classes are a system designed to classify land based on its best use and are divided into two groups for crop production or permanent vegetation.
- There are eight land capability classes, with higher numbers indicating less suitability for crop production.
- Class I land is very good for crop production, with ideal soils and no restrictions, while Class II has some limitations but is suitable for crop production.
- Class III may be used for crop production with certain conservation practices, and Class IV is borderline cultivatable land with severe limitations.
- Class V-VIII are suited only for permanent vegetation as pasture or forest and have increasing limitations for crop production.
- Each land capability class has specific characteristics related to slope, topsoil thickness, erosion, texture, permeability, drainage, and effective depth.
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Description
Test your knowledge of soil classification and land capability with this quiz. Explore slope categories, erosion classifications, topsoil texture, permeability, drainage, effective depth, and land capability classes. Understand the characteristics and best uses of different land capability classes for crop production or permanent vegetation.
