Landscape Design Soil Science and Irrigation

Question 1

What are the three primary macronutrients found in most commercial fertilizers, represented by the NPK ratio?

Accepted Answer

Nitrogen, Phosphorus, Potassium

Answer

NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K), the three primary macronutrients essential for plant growth and the basis of fertilizer labeling.

Question 2

Which soil texture has the highest water-holding capacity?

Accepted Answer

Clay soil

Answer

Clay soil has the highest water-holding capacity due to its tiny particle size and large surface area, though this can also lead to poor drainage and aeration.

Question 3

What is the 'field capacity' of soil?

Accepted Answer

The amount of water soil holds after excess drainage has occurred

Answer

Field capacity is the amount of moisture soil retains after gravitational water has drained away, representing the optimal moisture level for most plant growth.

Question 4

What does a soil percolation test measure?

Accepted Answer

The rate at which water drains through the soil

Answer

A percolation (perc) test measures the rate at which water drains through soil, critical for determining irrigation scheduling and suitability for features like rain gardens or septic systems.

Question 5

Which irrigation system type delivers water directly to the root zone, minimizing evaporation and runoff?

Accepted Answer

Drip irrigation system

Answer

Drip irrigation delivers water slowly and directly to the plant root zone, reducing evaporation, runoff, and foliar disease by keeping foliage dry.

Landscape Design Practice Test

Landscape Design Practice Test

Landscape Design Soil Science and Irrigation