Agronomy Irrigation and Water Management 1

Question 1

Which irrigation method delivers water directly to the root zone and is the most water-efficient?

Accepted Answer

Drip (trickle) irrigation

Answer

Drip irrigation delivers water slowly and directly to the plant root zone through emitters, minimizing evaporation and runoff losses.

Question 2

What is evapotranspiration (ET) used for in irrigation management?

Accepted Answer

Estimating crop water use to schedule irrigation timing and amounts

Answer

ET estimates the combined water loss from soil evaporation and plant transpiration, providing the basis for scheduling irrigation to replace crop water use.

Question 3

What is the field capacity of a soil?

Accepted Answer

The soil water content after free drainage has ceased following saturation

Answer

Field capacity is the soil moisture content remaining after excess water has drained under gravity, representing the upper limit of plant-available water.

Question 4

Which of the following is a common method for measuring soil moisture in irrigated fields?

Accepted Answer

Tensiometer

Answer

Tensiometers measure soil water tension (suction), which indicates how tightly water is held in the soil and when irrigation is needed.

Question 5

What is the permanent wilting point (PWP) of a soil?

Accepted Answer

The soil water content below which plants cannot recover turgor

Answer

The permanent wilting point is the soil moisture level at which plants can no longer extract water and will not recover even when water is added.

Agronomy Practice Test

Agronomy Practice Test

Agronomy Irrigation and Water Management 1