Land and Soil Analysis Quiz

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Questions and Answers

Which statement correctly differentiates land from soil?

Land is more important for plant growth than soil.

Land is a non-renewable resource, while soil can be regenerated.

Soil is primarily composed of weathered rocks, while land includes various elements like climate and vegetation. (correct)

Soil covers the entire surface of the earth, while land includes areas permanently covered by water.

What is indicated by the term 'land cover'?

The legal designation of land ownership and use.

The physical material present at the earth's surface, such as vegetation and asphalt. (correct)

The methods through which land is utilized by humans.

The economic value assigned to various types of land.

Which of the following best describes a watershed?

A geographic zone that houses various species of vegetation.

An area characterized by its urban land use and human activities.

A piece of land identified for agricultural purposes only.

A geographical area that drains to a common point or outlet. (correct)

What distinguishes land use from land cover?

Land cover pertains to the physical elements of the land, while land use refers to its socio-economic activities. Signup and view all the answers

Why is soil considered a non-renewable resource?

The formation process occurs too slowly for human timescales. Signup and view all the answers

What is NOT considered a permanent characteristic of land?

Stumps Signup and view all the answers

Which of the following factors does NOT determine land capability?

Plant species Signup and view all the answers

Land suitable for cultivation falls under which land suitability group?

Group A Signup and view all the answers

Which land capability class indicates increasing limitations for land use?

Class VIII Signup and view all the answers

What symbol is used to indicate excess water or wetness as a limitation?

w Signup and view all the answers

Which of the following characteristics is an internal or inherent soil feature?

Surface soil texture Signup and view all the answers

What is the final step in land capability classification referred to as?

Land capability unit Signup and view all the answers

Under which condition should soils in a capability unit produce similar potential productivity?

Within 25% variation Signup and view all the answers

What slope class corresponds to a range of 10-15%?

Class E Signup and view all the answers

Which erosion class is associated with moderate erosion characterized by sheet and rill?

e2 Signup and view all the answers

What proposed LC class is assigned to a slope class with a range of 3-5%?

II Signup and view all the answers

Which class of slope has a range of slope greater than 100%?

Class J Signup and view all the answers

What is the erosion class code for no erosion or slight erosion?

e1 Signup and view all the answers

Which slope class is associated with a 0-1% slope range?

Class A Signup and view all the answers

What proposed LC class does severe erosion belong to?

III Signup and view all the answers

What slope class has a range of 5-10%?

Class D Signup and view all the answers

What is the land capability classification for table lands with a slope of 3-5% located more than 6 meters from the gully rim?

Class III (b) Signup and view all the answers

Which of the following describes a semi-arid climate?

Frequently reduced crop yield due to drought Signup and view all the answers

What is the most accurate description of land with excessive wetness?

Wetness that continues after drainage Signup and view all the answers

What land capability classification would you assign to marginal land with a slope of 0-15% located 9 meters from the gully rim?

Class III Signup and view all the answers

Which salinity and alkalinity category corresponds to land that exhibits slight salinity?

Slight Signup and view all the answers

What type of land is classified as Class I with a slope between 0-1%?

Table land located more than 60m from the gully Signup and view all the answers

Which feature characterizes a very severe erosion classification?

Deep gully formation Signup and view all the answers

Which classification refers to land characterized by a slope of 1-3% and more than 60m from the gully?

Class II Signup and view all the answers

What method is used to determine the texture of top soil?

Feel method Signup and view all the answers

Which land capability class has a slope of 0-1%?

Class I Signup and view all the answers

Which of the following soil textures can belong to Class II?

Clay loam Signup and view all the answers

How is erosion hazard assessed according to the provided classification system?

By visual judgment Signup and view all the answers

Which characteristic does NOT apply to Class IV soils?

Soil depth >90 cm Signup and view all the answers

Determine the correct mapping unit for silty clay with a depth greater than 90 cm.

sil - d5 Signup and view all the answers

Which class has the least severe erosion hazard in the classification table?

Class I Signup and view all the answers

The soil depth classification for Class III ranges from?

22.5-45 cm Signup and view all the answers

What type of land capability class could have severe erosion hazard (e3)?

Class IV Signup and view all the answers

Which mapping unit represents a land slope of 5-10%?

d3 Signup and view all the answers

Which color is associated with a Class II land capability?

Yellow Signup and view all the answers

What is the mapping color indicating land with very far distance from active gully heads?

Green Signup and view all the answers

Study Notes

Land vs. Soil

Land: An area of ground that is not permanently covered by water.
Soil: Material on the upper earth crust primarily used for growing plants.
Watershed: A geographical area draining to a common point.

Land use vs. Land cover

Land cover: The physical material at the surface of the earth (e.g., grass, asphalt, trees).
Land use: How people utilize the land.

Factors determining land capability

External features of land: Slope, erosion features, water-logging.
Internal/Inherent soil characteristics: Surface soil texture, effective soil depth, permeability, drainage, salinity, alkalinity, fertility.
Environmental factors: Rainfall, temperature, wind velocity, evapotranspiration.

Land capability classification

Land suitability group:
- Land suitable for cultivation
- Land not suitable for cultivation
Land capability classes: I, II, III, IV, V, VI, VII, VIII - Increasing intensity of hazard and limitations of land use.
- Classes I-IV are suitable for cultivation.
- Classes V-VIII are not suitable for cultivation.
Sub-classes: Kind of limitation/ problem
- Erosion and runoff (e)
- Excess water/ wetness (w)
- Root zone limitation (s)
- Climatic limitations (c)
Land capability units: The final step in the land capability classification. Land with similar management requirements and conservation treatment under the same kind and condition of vegetation is designated as a land capability unit.
- Similar crops and pasture can be grown with similar management practices.
- Similar conservation treatment and management are required.
- Have comparable potential productivity.

Mapping units or symbols

Information for classification is recorded as mapping units: Soil series, texture of topsoil, effective soil depth, land slope, erosion hazard.
Mapping units can also be written as: Texture - depth, slope - erosion.
Mapping unit examples:
- loam (l) -d4: Soil texture - loam, Effective soil depth - 45-90 cm (d4)
- A – e1: Slope - 0-1% (A), Erosion hazard - Absent/very slight (e1)

Rating table for land capability classification

Attributes evaluated: Soil texture, soil depth, slope, erosion status, other attributes (e.g., climate, conductivity).
Classes and corresponding mapping units:
- I: sicl, cl, l, sl, sil, scl, >90 cm (d5), 0-1%, e1, Humid with well distributed rainfall
- II: sicl, cl, sl, sil, scl, 45-90 cm (d4), 1-3%, e1, Humid with occasional dry spell, sub-humid
- III: sc, sic, c, ls, 22.5-45 cm (d3), 3-5%, e2, Sub-humid, semi-arid
- IV: s, c, 7.5-22.5 cm (d2), 10-15%, e3, Semi arid and arid
Slope classes: A (0-1%), B (1-3%), C (3-5%), D (5-10%), E (10-15%), F (15-25%), G (25- 33%), H (33-50%), I (50-100%), J (>100%)
Erosion classes: e1 (No or slight erosion), e2 (Moderate erosion), e3 (Severe erosion), e4 (Very severe erosion)

Land capability classification in ravine lands

Land form:
- Table land
- Wide humps in between wide gullies
- Marginal land between the gully rim and LCC for ravine
Slope: 0-15%
Distance from gully rim: >60 m, 6-60 m, ≤ 6 m
Land capability class: I, II, III, IV, VI

Land capability classification mapping units

Boundaries of the area are delineated with black lines.

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Description

Test your knowledge on the differences between land and soil, the factors that determine land capability, and classifications of land use and cover. Explore key concepts related to environmental and agricultural practices.