CGM Assessment & Monitoring Methods 3

Question 1

Which irrigation audit metric expresses how uniformly water is distributed across a zone?

Accepted Answer

Distribution Uniformity (DU)

Answer

Distribution Uniformity (DU) measures how evenly water is applied across an irrigated area, calculated from catch-can data.

Question 2

What does a refractometer measure in the context of plant health monitoring?

Accepted Answer

Brix (sugar/soluble solids concentration) in plant sap, indicating plant vigor

Answer

A refractometer measures Brix, the concentration of dissolved sugars in plant sap, which correlates with overall plant health and nutritional status.

Question 3

When assessing pavement conditions adjacent to tree roots, which tool provides a non-destructive subsurface view?

Accepted Answer

Ground-penetrating radar (GPR)

Answer

Ground-penetrating radar sends electromagnetic pulses into the ground and maps subsurface features, including root intrusion, without excavation.

Question 4

A grounds manager suspects thatch buildup is reducing fertilizer uptake. What is the CORRECT assessment method?

Accepted Answer

Remove a 3-inch plug with a cup cutter and measure the thatch layer thickness with a ruler

Answer

Cutting a core plug and physically measuring the thatch layer between the green vegetation and the mineral soil is the standard thatch assessment method.

Question 5

Which statistical concept is MOST important when designing a monitoring grid for soil nutrient sampling on a large property?

Accepted Answer

Representative sampling to capture spatial variability across management zones

Answer

Representative sampling from multiple points within each management zone captures the actual spatial variability in soil nutrients, producing actionable data.

(CGM) Certified Grounds Manager Practice Test

(CGM) Certified Grounds Manager Practice Test

CGM Assessment & Monitoring Methods 3