Landscape Design Soil Science and Site Analysis 2

Question 1

What does 'N-P-K' stand for on a fertilizer label?

Accepted Answer

Nitrogen-Phosphorus-Potassium

Answer

N-P-K represents the three primary macronutrients — nitrogen, phosphorus, and potassium — listed as percentages by weight.

Question 2

What soil condition does a low pH (below 5.5) most commonly cause in landscape plants?

Accepted Answer

Nutrient deficiencies due to reduced availability of key elements

Answer

At pH below 5.5, phosphorus, calcium, and magnesium become less available, causing nutrient deficiencies even when present in the soil.

Question 3

What is the purpose of organic matter (compost) in landscape soil preparation?

Accepted Answer

To improve soil structure, water retention, drainage, and nutrient availability

Answer

Organic matter improves both drainage in clay soils and water retention in sandy soils while feeding soil microorganisms.

Question 4

Which site analysis factor must be determined before locating any underground irrigation or electrical lines?

Accepted Answer

Underground utility locations via 811 (Call Before You Dig)

Answer

Calling 811 is legally required before digging in most US states to locate buried utility lines and prevent damage.

Question 5

What is 'solar aspect' and why does it matter in landscape site analysis?

Accepted Answer

The direction a slope faces, determining sun exposure intensity and duration

Answer

A south-facing slope receives more intense sun and heat, while north-facing slopes stay cooler and moister, influencing plant selection.

Landscape Design Practice Test