CGM Turf Management & Sports Field Maintenance 1 — Questions and Answers
Question 1: What is the optimal soil pH range for most cool-season turfgrass species?
- 5.0–5.5
- 6.0–7.0 (Correct answer)
- 7.5–8.0
- 4.5–5.0
Correct answer: 6.0–7.0
Most turfgrass species perform best at a soil pH of 6.0–7.0, which optimizes nutrient availability and microbial activity.
Question 2: Which warm-season turfgrass is most commonly used for sports fields in the southern United States?
- Kentucky bluegrass
- Tall fescue
- Bermudagrass (Correct answer)
- Perennial ryegrass
Correct answer: Bermudagrass
Bermudagrass is the most widely used warm-season turfgrass for sports fields in the South due to its durability, heat tolerance, and rapid recovery from wear.
Question 3: What is 'thatch' in turfgrass management?
- A layer of decomposed organic matter below the soil surface
- A layer of dead and living organic matter between the soil and grass blades (Correct answer)
- A type of fungal disease affecting turfgrass roots
- A soil compaction layer that restricts water infiltration
Correct answer: A layer of dead and living organic matter between the soil and grass blades
Thatch is the layer of living and dead organic matter (stems, roots, rhizomes) that accumulates between the soil surface and the green grass blades.
Question 4: What is the primary purpose of core aerification in sports turf management?
- To apply fertilizer more efficiently to the root zone
- To relieve soil compaction and improve air, water, and nutrient movement (Correct answer)
- To remove thatch by mechanically cutting through it
- To level uneven playing surfaces
Correct answer: To relieve soil compaction and improve air, water, and nutrient movement
Core aerification relieves soil compaction by removing soil cores, which improves the movement of air, water, and nutrients to the root zone.
Question 5: Which macronutrient is primarily responsible for turfgrass color and shoot growth?
- Phosphorus (P)
- Potassium (K)
- Nitrogen (N) (Correct answer)
- Calcium (Ca)
Correct answer: Nitrogen (N)
Nitrogen is the primary macronutrient responsible for shoot growth and the green color of turfgrass, as it is a key component of chlorophyll.
Question 6: What is the typical mowing height range for bermudagrass maintained on a high-traffic sports field?
- 3.0–4.0 inches
- 2.5–3.5 inches
- 0.5–1.5 inches (Correct answer)
- 4.0–5.0 inches
Correct answer: 0.5–1.5 inches
Bermudagrass sports fields are maintained at 0.5–1.5 inches to provide a firm, smooth playing surface and encourage dense lateral growth.
Question 7: What does 'topdressing' refer to in turf management?
- Applying a pre-emergent herbicide to the turf surface
- Applying a thin layer of sand or soil mixture to the turf surface (Correct answer)
- Applying granular fertilizer to the top of the grass canopy
- Trimming the edges of the turf to maintain clean borders
Correct answer: Applying a thin layer of sand or soil mixture to the turf surface
Topdressing involves applying a thin layer of sand, compost, or soil mixture to the turf surface to smooth the surface, dilute thatch, and improve soil structure.
CGM Turf Management & Sports Field Maintenance 1
What is the optimal soil pH range for most cool-season turfgrass species?