Exam3_Sp00 - AGRN 2203 - Soil Science Exam III Tuesday,...

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AGRN 2203 - Soil Science Exam III Tuesday, April 18, 2000 Your Name____________________________ TA_________________________________ 1. All of the following are aspects of the "phosphorus problem" in soil fertility except: _____ a) the total phosphorus level of soils is low. b) much of the phosphorus in soils is insoluble and not available to plants. c) phosphorus compounds are highly volatile and are readily lost from soils through volatilization. d) the P in soluble phosphorus fertilizers is "fixed", or converted into insoluble forms, when P fertilizers are added to the soil. e) none of the above. 2. Nematodes are an example of soil: _____ a) microflora. b) fungi. c) bacteria. d) microfauna. e) macrofauna. 3. When the phosphorus fixation capacity of a soil has been exceeded: _____ a) crops growing on the soil are likely to exhibit P deficiency symptoms. b) runoff from the soil is likely to contain elevated levels of soluble P. c) the P in added fertilizers will be rapidly fixed. d) the soil pH will drop rapidly. e) the soil will become anaerobic. 4. Riparian buffer strips are effective in: _____ a) preventing nutrients and sediment contained in runoff from entering streams and lakes. b) moderating soil pH. c) reducing concentrations of subsoil aluminum. d) reducing ammonia volatilization from soils. e) increasing the rate at which organic phosphorus is mineralized. f) all of the above. 5. Probably the most important function of soil organisms is: _____ a) moderating soil temperature. b) production of molecular oxygen. . c) production of methane and hydrogen sulfide. d) decomposition of organic residues. e) accumulation and subsequent detoxification of metals such as cadmium, nickel,and chromium. 6. The formal oxidation state of N in NO 3 - is: _____ a) -5. b) -3. c) 0. d) +3. e) +5.
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7. All of the following would tend to reduce the amount of nitrate lost from a soil through leaching except: _____ a) applying N fertilizer in several smaller splits instead of all at once. b) raising the pH by liming. c) seeding the soil in the fall to a non-leguminous winter cover crop. d) use of a nitrification inhibitor. e) none of the above.
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This note was uploaded on 04/28/2008 for the course CSES 2203 taught by Professor Miller during the Fall '07 term at Arkansas.

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Exam3_Sp00 - AGRN 2203 - Soil Science Exam III Tuesday,...

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