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Score ______________ / 30 Quiz #4
(return to Turf
Home or Old Exams)
Multiple choice. (12 pts.) Please read these carefully. Only one response
correctly answers the question, or completes the statement. Circle the corresponding
letter (a, b, c, d, or e). 1. In class we observed that fine soil particles, i.e., silt and clay, fall slower in water than coarse particles, i.e., sand. This demonstrates that: a. fine soils tend to shrink and swell b. fine particles are lighter than coarse particles c. heavy soils tend to dry out more than light sandy soils d. fine particles have a higher surface area to volume ratio e. fine soil particles are not different from coarse soil
particles 2. Which plant nutrient is present in the atmosphere, but plants generally take it up through their roots, from the soil solution? a. carbon b. nitrogen c. sodium d. all of the above e. none of the above 3. What is true of soil reaction? a. the lower the pH the higher the acidity b. the higher the pH the lower the acidity c. pH is proportional to the negative log of the concentration of hydrogen ions d. all of the above e. none of the above 4. Which nutrient is often limited in availability at high soil pH? a. aluminum b. nitrogen c. sulfur d. iron e. calcium 5. Which of the following problems is associated with a sandy soil? a. poor drainage b. poor aeration c. leaching of nutrients d. all of the above e. none of the above 6. K is the chemical symbol for a. phosphorus b. kryptonite c. potassium d. manganese e. calcium Short answer.
(18 pts.) 7. What are the four factors that soil provides to
turfgrass roots? (4 pts.) _________________________________________________________________
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8. What is the preferred pH range for most turfgrasses? (2
pts.) _________________________________________________________________
9. Which nitrogen source has the greatest acid-forming
ability? (2 pts.) _________________________________________________________________
10. Which soil problem was pointed out during our tour, at
each three turf installations? (2 pts.) _________________________________________________________________
11. Which source of nitrogen is both organic and
synthetic? (2 pts.) _________________________________________________________________
12. What is the difference between macropores and
micropores in the following characteristics (choices in parentheses)? (6 pts.)
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