Landscape Design Soil Science and Site Analysis

Question 1

What are the three primary soil texture classes in the USDA soil texture triangle?

Accepted Answer

Sand, silt, and clay

Answer

Clay, silt, and gravel

Answer

Topsoil, subsoil, and bedrock

Answer

Loam, humus, and peat

Question 2

What does a soil percolation test measure in landscape site analysis?

Accepted Answer

The rate at which water drains through the soil

Answer

Soil pH

Answer

Soil nutrient levels

Answer

Compaction depth

Question 3

Which soil amendment is commonly added to heavy clay soil to improve drainage and aeration?

Accepted Answer

Coarse sand or grit, along with organic matter

Answer

Peat moss alone

Answer

Lime

Answer

Topsoil

Question 4

What is the purpose of a 'topographic survey' in landscape design site analysis?

Accepted Answer

To map existing grade elevations and slopes across the site

Answer

To identify plant species on site

Answer

To test soil chemistry

Answer

To locate underground utilities

Question 5

What does a 'soil compaction test' using a penetrometer measure?

Accepted Answer

The resistance of soil to penetration, indicating compaction level

Answer

Soil moisture content

Answer

Soil pH

Answer

Presence of soil pathogens

Question 6

Which landscape condition is indicated by a high water table near the soil surface?

Accepted Answer

Poor drainage and risk of root suffocation for non-wetland plants

Answer

Drought stress potential

Answer

High nutrient availability

Answer

Sandy soil texture