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True/False
Indicate whether the sentence or statement is true or false. |
| | 1. | Lack of sufficient oxygen in saturated soil inhibits root growth and normal functioning. |
| | 2. | Height of the water table has no affect on air and water movement in the subsoil. |
| | 3. | Management practices which overcome soil limitations on a site do not change the land class. |
| | 4. | The most restricting classification of a soil feature indicates the classification to be used for the land. |
| | 5. | Erosion is the main limitation on “somewhat poorly drained”, “poorly drained”, “very poorly drained”, and swampy soils with slopes less than 2 percent. |
| | 6. | Lime and fertilizer should be applied according to crop needs as determined by soil tests on classes I,II, IV, and VI land. |
| | 7. | Soil texture is the physical condition of the soil as related to tillage, seedbed preparation, seedling emergence, and root penetration. |
| | 8. | Loam is dark colored, finely divided, well decomposed organic soil material. |
| | 9. | Fragipan is a layer of solid rock or jointed rock. |
| | 10. | Soil depth is defined as the thickness of all contiguous layers of soil from the surface downward which do not have favorable permeability and water holding capacity. |
| | 11. | Sandy soils feels and sounds gritty and ball usually breaks in your hand. |
| | 12. | The four soil texture classes are loamy, clayey, sandy, and gravelly. |
| | 13. | Moderate erosion refers to areas where the original topsoil is gone. |
| | 14. | A 24 foot rise over 200 feet off horizontal distance is a 6% slope. |
| | 15. | Land capability and land class are the same. |
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Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question. |
| | 16. | The arrangement of primary soil particles into compound particles or aggrates is _____. | a. | Soil horizon | b. | Soil structure | c. | Soil profile | | | | | | | | |
| | 17. | A tillage systems that does not invert the soil but leaves a protective amount of crop residue on the surface throughout the year is ________________ | a. | Ridge tillage | b. | Strip cropping | c. | Conservation tillage | | | | | | | | |
| | 18. | The depth of a moderately deep soil is: | a. | 10 to 20 inches to root restrictive layer | | b. | 20 to 40 inches to root restrictive layer | | c. | 40 inches or more to root restrictive layer | | | | |
| | 19. | Determination of the best cropping system or use of land based upon its texture, drainage, slope, and organic matter content is land ______________ | a. | Capability | b. | Description | c. | Conservation practices | | | | | | | | |
| | 20. | Texture of surface soil that is fine and very sticky when wet is _____________. | a. | Loam | b. | Silt | c. | Sand | d. | Clay | | | | | | | | | | |
| | 21. | The difference in elevation of the land surface from one location to another usually expressed as a percentage which is the feet of rise or fall in 100 ft. of horizontal distance is the _____________. | a. | Soil horizon | b. | Soil zone | c. | Slope | | | | | | | | |
| | 22. | Strip cropping with contour tillage should be used on land that has a slope of: | a. | 6 to 15% | b. | 18 to 25% | c. | 2 to 6% | | | | | | | | |
| | 23. | A ridge of earth, generally a terrace, built to protect down slope areas by run off from it’s natural course is a _______________. | a. | Watershed | b. | Grass waterway | c. | Diversion channel | | | | | | | | |
| | 24. | The wearing away of the land surface by water, wind, ice, or other geologic agents and by such processes as gravitational creep is_________________. | a. | Erosion | b. | Infiltration | c. | Leaching | | | | | | | | |
| | 25. | Analyzing by chemical and physical tests the makeup of a particular soil sample as one step in determining land capacity is a _____________. | a. | Plant analysis | b. | Soil test | c. | Soil texture | | | | | | | | |