CH Irrigation and Water Management 2

Question 1

Irrigation run times should generally be split into shorter 'cycle and soak' cycles for slopes and clay soils to:

Accepted Answer

Allow water to infiltrate before runoff occurs

Answer

Cycle-and-soak scheduling runs short irrigation cycles with rest intervals, allowing slow-draining soils or slopes time to absorb water between applications and eliminating runoff.

Question 2

Which factor most directly affects irrigation precipitation rate (how fast water is applied)?

Accepted Answer

Nozzle flow rate and spacing

Answer

Precipitation rate (inches per hour) is calculated from nozzle flow rate and spacing; mismatched nozzles on the same zone create highly uneven application.

Question 3

A smart irrigation controller adjusts run times automatically based on:

Accepted Answer

Local weather data such as temperature, wind, and ET

Answer

Smart (weather-based or ET) controllers use local climate data to calculate actual plant water needs and adjust schedules daily without manual changes.

Question 4

Over-irrigation of landscape plants most commonly leads to which root problem?

Accepted Answer

Anaerobic conditions promoting root rot pathogens

Answer

Waterlogged soils become oxygen-depleted (anaerobic), promoting Phytophthora, Pythium, and other water mold pathogens that cause root rot.

Question 5

What is the primary advantage of using reclaimed (recycled) water for landscape irrigation in the US?

Accepted Answer

Conservation of potable drinking water supplies

Answer

Reclaimed water is treated wastewater that would otherwise be discharged; using it for irrigation reduces demand on potable water supplies and can supplement plant nutrients.

CH - Certified Horticulturist Practice Test

CH - Certified Horticulturist Practice Test

CH Irrigation and Water Management 2