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1995 Ohio State Rural Soils Test



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

 1. 

A uniform gray in color in the soil is not always an indicator of seasonal saturation with water.
 

 2. 

Five (5) percent slope does not refer to 5 feet rise or fall in 100 feet of horizontal distance.
 

 3. 

The subsoil is the C horizon.
 

 4. 

Severe erosion has more than 75% of the original topsoil removed.
 

 5. 

A shallow soil is 20 to 40 inches deep to a restrictive layer.
 

 6. 

A moderately well drained soil has gray mottling below a depth of 40 inches.
 

 7. 

Soils that are sandy throughout are always well drained.
 

 8. 

Of the three (3) primary soil particles, sand is the largest.
 

 9. 

Land is one of the most valuable resources and covers about 50 percent of the earth’s surface.
 

 10. 

Surface drainage is usually not needed on very poorly drained soils.
 

 11. 

There are more than 400 different series or contrasting kinds of soil in Ohio.
 

 12. 

Rill erosion is characterized by shallow channels cut into the surface layer of the soil.
 

 13. 

Clayey textured soils often have more water available to plants than loamy soils.
 

 14. 

The color of a moist subsoil is the best indicator of air and water movement in the subsoil.
 

 15. 

Nearly level land in Capability Classes II and III Soils, when drained, can be row cropped intensively.
 

 16. 

Crop residues incorporated in sandy textured soils do not increase the moisture and plant-nutrient-holding capacity.
 

 17. 

Soil depth refers to the relative thickness of the topsoil.
 

 18. 

Coarse sand and gravel is not considered root restrictive since it may be easily penetrated by roots.
 

 19. 

Contouring is most effective on Class III somewhat poorly drained soils having slopes up to 6 percent.
 

 20. 

Lack of sufficient oxygen in a saturated soil inhibits root growth.
 

 21. 

A loamy soil forms a long, thin ribbon when pressed between the thumb and index finger.
 

 22. 

Stones and rock fragments 10 to 24 inches in diameter.
 

 23. 

A somewhat poorly drained soil is mottled immediately below the plow layer.
 

 24. 

The plow layer of a soil may consist entirely of subsoil.
 

 25. 

Fragipans usually have a clayey texture.
 



 

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