IA Irrigation Scheduling & Evapotranspiration

Question 1

Which term describes the combined process of water evaporation from soil and transpiration from plants?

Accepted Answer

Evapotranspiration

Answer

Precipitation

Answer

Infiltration

Answer

Percolation

Question 2

Reference evapotranspiration (ETo) is most commonly calculated using which method recognized by the FAO?

Accepted Answer

Penman-Monteith method

Answer

Blaney-Criddle method

Answer

Hargreaves method

Answer

Thornthwaite method

Question 3

A crop coefficient (Kc) is used to adjust ETo for a specific crop. What does a Kc value of 1.2 indicate?

Accepted Answer

The crop uses 20% more water than the reference crop

Answer

The crop uses 20% less water than the reference crop

Answer

The crop uses the same amount as reference

Answer

The soil is 20% saturated

Question 4

Which irrigation scheduling method uses soil moisture sensors to determine when to irrigate?

Accepted Answer

Soil water depletion method

Answer

Calendar-based scheduling

Answer

Checkbook method

Answer

Evaporation pan method

Question 5

What is the Management Allowable Depletion (MAD) typically set at for most turf and landscape irrigation?

Accepted Answer

25–40%

Answer

10–20%

Answer

50–60%

Answer

70–80%

Question 6

An irrigation controller that automatically adjusts run times based on local ET data is called a:

Accepted Answer

Smart or ET-based controller

Answer

Time-based controller

Answer

Interval timer

Answer

Hydraulic controller