CPESC Vegetative Stabilization 2

Question 1

What is the minimum recommended seeding rate for tall fescue (Festuca arundinacea) when used as a permanent erosion control cover on disturbed slopes?

Accepted Answer

6-8 lbs PLS/acre

Answer

Tall fescue is typically seeded at 6-8 lbs pure live seed per acre for permanent erosion control applications on disturbed slopes.

Question 2

Which soil amendment is most commonly added to highly acidic soils (pH below 5.5) prior to seeding to promote vegetative establishment?

Accepted Answer

Agricultural lime

Answer

Agricultural lime (calcium carbonate) is applied to raise soil pH in acidic soils, creating more favorable conditions for seed germination and plant growth.

Question 3

A contractor needs to establish vegetation on a cut slope with a 3:1 gradient. Which seeding method would provide the best seed-to-soil contact on this steep surface?

Accepted Answer

Hydraulic seeding with tackifier

Answer

Hydraulic seeding with tackifier suspends seed in a slurry and adheres it to steep slopes where mechanical incorporation is impractical.

Question 4

What is the primary reason warm-season grasses are preferred over cool-season grasses for erosion control seedings in the southeastern United States during summer?

Accepted Answer

They are drought-tolerant and actively grow during hot summer months

Answer

Warm-season grasses like bermudagrass and bahiagrass thrive during summer heat and drought conditions common in the southeastern US, establishing quickly when seeded in late spring.

Question 5

When establishing vegetation on a site with highly compacted subsoil, which practice is most critical BEFORE seeding?

Accepted Answer

Deep tillage or scarification to a minimum of 4 inches

Answer

Deep tillage or scarification breaks up compaction layers that restrict root penetration, water infiltration, and nutrient availability essential for vegetative establishment.

(CPESC) Certified Professional in Erosion and Sediment Control Practice Test

(CPESC) Certified Professional in Erosion and Sediment Control Practice Test

CPESC Vegetative Stabilization 2