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District 9 Rural Soils Test



True/False
Indicate whether the sentence or statement is true or false.
 

 1. 

Percent slope is defined as feet fall or rise in 200 feet.
 

 2. 

Soil texture refers to the aggregation of soil mineral particles.
 

 3. 

Clay is the smallest mineral soil particle.
 

 4. 

Loamy soils contain sand
 

 5. 

A clayey textured soil may contain sand in the mineral mixture.
 

 6. 

A profile is a cross section of soil from the surface downward.
 

 7. 

Most fields with 5 inches of topsoil are not considered eroded.
 

 8. 

A present topsoil which has 25 to 75% of subsoil material mixed with the original topsoil material is moderately eroded.
 

 9. 

Erosion will not take place on land with 1.5% slope.
 

 10. 

Coarse sand and gravel, occurring as a thick layer in the soil profile, are considered restrictive to root growth.
 

 11. 

A fragipan is a layer of solid rock.
 

 12. 

There are four soil depth classes.
 

 13. 

Soil that has a depth of 40” or more is a deep soil.
 

 14. 

Soil tilth refers to the workability of soil.
 

 15. 

An intensive cropping system can be used only on class I land.
 


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 16. 

The darker color of topsoil is usually caused by:

a.

The organic matter in the soil

c.

Soil texture

b.

Oxidation of soil minerals

 

 17. 

Irregular color patterns or mixtures of colors in the subsoil are called:

a.

Restricted

b.

Oxidation

c.

Mottling

 

 18. 

A somewhat poorly drained soil usually has a subsoil which is:

a.

Bight and uniform in color

b.

Splotched with a mixture of gray, yellow, or brown

c.

Red in color

 

 19. 

Crop residues plowed under improve:

a.

Soil tilth

b.

Soil drainage

c.

Soil texture

 

 20. 

An intensive cropping system is where:

a.

Sod crops predominate

b.

Row crops predominate

c.

Neither predominate

 

 21. 

A moderate cropping system which includes row crops half the time and meadow or soil-conserving crops half the time is the most intensive cropping system that can be used on land in:

a.

Class I

b.

Class II

c.

Class III

 

 22. 

When drain tile is installed on nearly level, somewhat poorly drained land with loamy textured deep soil, the land class:

a.

Changes to Class I

b.

Changes to Class III

c.

Changes to Class II

 

 23. 

The depth of a shallow soil is:

a.

40” or more to a restrictive layer

c.

10 to 20” to a restrictive layer

b.

20 to 40” to a restrictive layer

 

 24. 

The minimum depth of topsoil on land with little or no erosion is:

a.

5”

b.

6”

c.

7”

 

 25. 

Land which has a 2.5% complex slope and is well drained should have:

a.

Strip cropping with contour tillage

c.

Conservation tillage management

b.

Contour tillage

 

 26. 

A cropping system with occasional row crops is the most intensive agricultural use that can be made of:

a.

Class III land

b.

Class IV land

c.

Class V land

 

 27. 

Surface draining should be used on land that is:

a.

Somewhat poorly drained

b.

Very poorly drained

c.

Moderately well drained

 

 28. 

An earth ridge or embankment constructed on a slight grade across a slope with a channel above which carries water to an outlet is a:

a.

Sod waterway

b.

Diversion channel

c.

Terrace

 

 29. 

Strip cropping with contour tillage should be used on land that has a slope of:

a.

18 to 25%

b.

6 to 18%

c.

2 to 6%

 

 30. 

Soil should be tested for plant nutrient content:

a.

Every year

b.

Every crop rotation

c.

Every six years

 



 

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