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SWES 200 exam 3 2007

SWES 200 exam 3 2007 - 1 SWES 200 Introduction to Soil...

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1 SWES 200 Introduction to Soil Science Name ____________________ 20 November 2007 Exam III True/False - 1 point each 1. or F If elemental sulfur (S) is added to soil, microbial sulfur transformations result T in increased soil acidity. 2. or F In “classic” soil sampling, between 15 and 25 soil cores (sub-samples) are T recommended to get a reliable, representative soil sample. 3. T or Zinc deficiency is more likely to occur in low pH, rather than high pH, soils. F 4. or F Addition of organic materials with a high carbon to sulfur ratio (C:S) can T lead to sulfur immobilization. 5. T or Soil salinity occurs only as a result of human activity. F 6. T or Soils in southern Arizona are likely to be acidic. F 7. T or Organic fertilizers are better than inorganic fertilizers because the nitrogen F absorbed by plants fertilized with organic fertilizers is already in an organic form. 8. or F Agricultural soils in southern Arizona are likely to contain sufficient K for T plants. 9. or F The primary reason for liming acid soils is to reduce aluminum toxicity. T 10. or F When sampling soils for agricultural purposes, we are usually most interested in T bioavailable rather that total levels of chemical elements. Multiple Choice - 2 points each (select the single best answer) 11. Which of the following are concerns associated with application of sewage sludge to agricultural lands? a. Elevated levels of heavy metal b. The presence of human pathogens c. The presence of pharmaceuticals d. B and C e. All of the above
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2 12. Which of the following nutrients would be most commonly applied as a foliar fertilizer? a. Nitrogen b. Zinc b. Phosphorus c. Sulfur d. Potassium 13. Sulfur dioxide in the atmosphere a. Can be an important source of sulfur nutrition for plants b. Is a major contributor to “acid rain” c. Comes from burning fossil fuels d. B and C e. A, B and C 14. If one can afford only to put a limited amount of triple superphosphate on a calcareous soil with low P availability, the best plant growth will be obtained if P fertilizer is applied as follows: a. Several months in advance of the plant’s main period of nutrient uptake b. Broadcast evenly and mixed thoroughly with the soil in the root zone
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SWES 200 exam 3 2007 - 1 SWES 200 Introduction to Soil...

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