CFB Soil Science & Amendments 2

Question 1

Which soil texture has the highest water-holding capacity per unit volume?

Accepted Answer

Clay

Answer

Clay has the smallest particles, the greatest surface area, and the smallest pore spaces, allowing it to retain the most water per unit volume.

Question 2

On a soil penetrometer, readings consistently above 300 psi typically indicate:

Accepted Answer

Severe compaction that significantly restricts root growth

Answer

Penetrometer readings above 300 psi signal severe compaction that physically prevents root penetration and reduces turfgrass vigor.

Question 3

Calcitic limestone is applied to sports field soils primarily to:

Accepted Answer

Raise soil pH by neutralizing acidity

Answer

Calcitic limestone (calcium carbonate) reacts with hydrogen ions in acidic soils to raise pH toward the optimal range for turfgrass.

Question 4

According to USGA green construction specifications, approximately what percentage of the root zone mix is sand?

Accepted Answer

80–100%

Answer

USGA-specification root zones are predominantly sand (80–100%) with a small peat fraction to achieve the required infiltration rates of at least 6 inches per hour.

Question 5

Which amendment improves both drainage AND cation exchange capacity in sports field soils?

Accepted Answer

Calcined clay (e.g., Turface)

Answer

Calcined clay products like Turface have a highly porous structure that improves drainage and also possess elevated CEC for nutrient retention.

(CFB) Certified Field Builder Practice Test

(CFB) Certified Field Builder Practice Test

CFB Soil Science & Amendments 2