CH Irrigation and Water Management

Question 1

Which irrigation system delivers water directly to the root zone with the greatest water-use efficiency?

Accepted Answer

Drip/micro-irrigation

Answer

Overhead sprinkler

Answer

Flood irrigation

Answer

Sprinkler oscillation system

Question 2

Evapotranspiration (ET) represents the combined water loss from:

Accepted Answer

Soil evaporation and plant transpiration

Answer

Rainfall and irrigation

Answer

Deep percolation and runoff

Answer

Root uptake and guttation

Question 3

A distribution uniformity (DU) test for a sprinkler system measures:

Accepted Answer

How evenly water is applied across the irrigated area

Answer

Soil moisture at various depths

Answer

Water pressure at each head

Answer

Flow rate from each emitter

Question 4

Which condition is an early visible sign of plant water stress (drought stress)?

Accepted Answer

Leaf curl or wilting in the morning

Answer

Leaf yellowing starting from the base

Answer

Purple stem coloration

Answer

Sudden drop of fruit

Question 5

Irrigation scheduling based on soil moisture sensors is preferred over calendar-based scheduling because it:

Accepted Answer

Applies water only when plants actually need it, reducing overwatering

Answer

Is always less expensive to install

Answer

Works without any maintenance

Answer

Eliminates the need for a controller

Question 6

Backflow prevention devices on irrigation systems are required in the US primarily to:

Accepted Answer

Prevent contaminated irrigation water from entering the potable water supply

Answer

Increase water pressure

Answer

Filter sediment from emitters

Answer

Reduce water hammer in pipes