Agronomy Irrigation and Water Management

Question 1

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

Accepted Answer

Drip (trickle) irrigation

Answer

Flood irrigation

Answer

Center pivot irrigation

Answer

Furrow irrigation

Question 2

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

Accepted Answer

Estimating crop water use to schedule irrigation timing and amounts

Answer

Measuring rainfall totals

Answer

Calculating herbicide dilution rates

Answer

Predicting frost dates

Question 3

What is the field capacity of a soil?

Accepted Answer

The soil water content after free drainage has ceased following saturation

Answer

The minimum water content at which a plant can survive

Answer

The total pore space volume of the soil

Answer

The maximum depth of water that can infiltrate in one hour

Question 4

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

Accepted Answer

Tensiometer

Answer

Refractometer

Answer

Penetrometer

Answer

Lysimeter

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 soil water content at which irrigation must begin

Answer

The optimal irrigation frequency for sandy soils

Answer

The maximum root depth for most field crops

Question 6

Center pivot irrigation systems are designed to apply water in what pattern?

Accepted Answer

Circular pattern around a central pivot point

Answer

Rectangular grid

Answer

Uniform grid using overhead sprinklers

Answer

Linear strips along field contours