Landscape Design Soil Science and Site Preparation

Question 1

What is the ideal soil texture for most landscape plantings, balancing drainage and water retention?

Accepted Answer

Loam

Answer

Loam, a balanced mixture of sand, silt, and clay, provides ideal porosity, drainage, and water-holding capacity for most landscape plants.

Question 2

What soil test result is most important before amending soil for a new landscape installation?

Accepted Answer

pH and nutrient levels (N, P, K)

Answer

A baseline soil test for pH and macronutrient levels guides amendment decisions and prevents over or under fertilizing.

Question 3

What does soil compaction do to plant root development?

Accepted Answer

Restricts oxygen flow and root penetration, stunting growth

Answer

Compacted soil has reduced pore space, limiting oxygen availability and making it mechanically difficult for roots to penetrate, resulting in shallow, stressed root systems.

Question 4

Which organic matter amendment is most commonly incorporated into planting beds to improve soil structure?

Accepted Answer

Compost

Answer

Compost improves soil structure, drainage in clay soils, water retention in sandy soils, and adds organic matter that feeds beneficial soil microorganisms.

Question 5

What is a soil horizon relevant to landscape grading and planting?

Accepted Answer

A distinct vertical layer of soil with different characteristics

Answer

Soil horizons are distinct horizontal layers with different textures, organic matter, and colors that develop over time and affect drainage and rooting.

Landscape Design Practice Test

Landscape Design Practice Test

Landscape Design Soil Science and Site Preparation