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 earths 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. |