FREE IA Soil-Water-Plant Relationships Questions and Answers

Question 1

Why is soil texture important in irrigation planning?

Accepted Answer

It controls water retention and movement

Answer

It determines fertilizer requirements

Answer

It affects soil temperature

Answer

It changes root depth

Question 2

What is field capacity in relation to soil moisture?

Accepted Answer

Water held in soil after free drainage

Answer

Water below the root zone

Answer

Soil completely saturated

Answer

Minimum water content before wilting

Question 3

Which factor most directly influences plant water uptake?

Accepted Answer

Root zone moisture

Answer

Leaf size

Answer

Plant color

Answer

Air temperature

Question 4

What is the primary role of evapotranspiration (ET) in irrigation?

Accepted Answer

To estimate water needs

Answer

To measure fertilizer loss

Answer

To calculate rainfall

Answer

To monitor root growth

Question 5

How does compaction affect soil-water-plant relationships?

Accepted Answer

Reduces infiltration and root development

Answer

Improves drainage

Answer

Increases aeration

Answer

Promotes microbial activity

Question 6

What happens when water is applied faster than the soil’s infiltration rate?

Accepted Answer

It causes runoff

Answer

It increases crop yield

Answer

It enhances deep watering

Answer

It promotes evaporation