IA Irrigation Scheduling & Evapotranspiration 2

Question 1

Which weather variable has the greatest influence on reference evapotranspiration (ETo) in humid climates?

Accepted Answer

Net radiation

Answer

Wind speed

Answer

Relative humidity

Answer

Soil temperature

Question 2

The 'checkbook method' of irrigation scheduling tracks what two primary inputs?

Accepted Answer

Rainfall and ET

Answer

Fertilizer and pH

Answer

Temperature and wind

Answer

Runoff and deep percolation

Question 3

What does the term 'irrigation interval' refer to?

Accepted Answer

The number of days between irrigation events

Answer

The duration of each watering event

Answer

The number of sprinkler heads per zone

Answer

The pressure loss across a valve

Question 4

If daily ETo is 0.25 inches and the crop coefficient is 0.8, what is the daily crop water use (ETc)?

Accepted Answer

0.20 inches

Answer

0.05 inches

Answer

0.31 inches

Answer

0.45 inches

Question 5

Which instrument is used to directly measure reference evapotranspiration in the field?

Accepted Answer

Lysimeter

Answer

Anemometer

Answer

Piezometer

Answer

Tensiometer

Question 6

Which factor does NOT directly influence evapotranspiration rates?

Accepted Answer

Soil pH

Answer

Solar radiation

Answer

Wind speed

Answer

Relative humidity