CFB Soil Science & Amendments

Question 1

What sand particle size range does the USGA recommend for sports field root zones?

Accepted Answer

0.25–1.0 mm (medium to coarse sand)

Answer

USGA specifications recommend sand predominantly in the 0.25–1.0 mm range to balance adequate drainage with structural stability.

Question 2

Which soil texture classification is generally considered most problematic for natural grass sports fields without significant amendment?

Accepted Answer

Clay

Answer

Clay soils have poor drainage, high compaction potential, and become very slippery when wet, making them the most problematic for sports fields.

Question 3

What does the Standard Proctor Test determine?

Accepted Answer

Maximum dry density and optimum moisture content for compaction

Answer

The Proctor test identifies the optimum moisture content at which a soil achieves its maximum dry density when compacted, which is used to set compaction specifications.

Question 4

What is the optimal soil pH range for most cool-season turfgrasses used on sports fields?

Accepted Answer

6.0–7.0

Answer

Cool-season grasses thrive at pH 6.0–7.0, the range at which macro and micronutrients are most available and soil microbial activity is optimized.

Question 5

Which amendment is most commonly added to heavy clay subsoils to improve drainage on sports fields?

Accepted Answer

Coarse sand

Answer

Coarse sand is added to clay soils to increase macropore space, which improves infiltration and drainage rates.

(CFB) Certified Field Builder Practice Test

(CFB) Certified Field Builder Practice Test

CFB Soil Science & Amendments