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Exam+3 - Soil Science 10 Midterm Exam#3 Mark each statement...

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Soil Science 10 Midterm Exam #3 Mark each statement true or false. Each correct answer is worth 2 points (20 points total). 1. Most “soil” organisms are heterotrophs. 2. Phytoremediation refers to the use of microorganisms to remove pollutants from soils . 3. The addition of gypsum (CaSO 4 · 2H 2 O) is an important step in reclaiming sodic soils. 4. Among wind erosion mechanisms, saltation results in the greatest loss of soil. 5. Crop rotation leads to a lower diversity of soil organisms compared to monoculture ( e.g., continuous planting of corn). 6. Since 1982, erosion on croplands in the United States has decreased by nearly 50%. 7. Profits from farms practicing sustainable agricultural are typically lower than from those practicing conventional farming. 8. The major source of phosphorus in soils is from the chemical weathering of rocks/minerals. 9. Plants experiencing “hidden hunger” from the lack of nitrogen will display chlorosis in their foliage. 10. Saline soils will have a higher osmotic potential than non-saline soils. (Points) (2) 11. Which cation has especially damaging effects on both soil permeability and toxicity to crops?
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