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True/False
Indicate whether the sentence or statement is true or false. |
| | 1. | Land class depends only on slope. |
| | 2. | A loamy soil forms a long, narrow ribbon. |
| | 3. | Surface drainage is used mainly on nearly level soils. |
| | 4. | Tiling a field changes its capability. |
| | 5. | Chunks of subsoil material in the plow layers, indicates erosion. |
| | 6. | A soil 20-40 inches deep over rock is moderately deep. |
| | 7. | The “A” horizon of a soil is also considered to be the subsoil. |
| | 8. | Clay is the smallest mineral soil particle. |
| | 9. | Clay particles in the soil are easily seen with the naked eye. |
| | 10. | Row crops should never be grown in class IV land. |
| | 11. | If the subsoil is mottled above a depth of 16 inches, it is assumed that air and water movement is slow or very slow. |
| | 12. | Somewhat poorly drained soil has poorly developed structure and is dominantly gray or gray mottled with yellowish or reddish brown. |
| | 13. | Depth of soil is very shallow when the root restrictive layer is 10-20 inches. |
| | 14. | A slope of 18-25 percent is considered steep. |
| | 15. | Rill erosion is characterized by shallow channels cut into the surface layer of soil. |