Agriculture and Environment Water Resources & Irrigation Management 2

Question 1

Which practice most effectively reduces agricultural irrigation water loss from evaporation?

Accepted Answer

Irrigating at night or early morning

Answer

Irrigating at night or early morning reduces evaporation losses because temperatures and wind speeds are lower, allowing more applied water to reach plant roots rather than being lost to the atmosphere.

Question 2

A farm 'water budget' primarily tracks:

Accepted Answer

Water inputs, outputs, and storage to ensure sustainable use

Answer

A farm water budget accounts for all inputs (precipitation, irrigation) and outputs (ET, runoff, deep percolation) to manage water resources sustainably across the growing season.

Question 3

What is deficit irrigation as a water management strategy?

Accepted Answer

Applying less water than full crop requirements during drought-tolerant growth stages to conserve water

Answer

Deficit irrigation intentionally applies less water than full crop requirements during growth stages when crops are most drought-tolerant, conserving water with minimal impact on final yield.

Question 4

Which cover crop practice best improves soil water retention in dryland farming systems?

Accepted Answer

Selecting deep-rooted cover crops that improve soil structure and organic matter

Answer

Deep-rooted cover crops improve soil structure by creating biopores and increasing organic matter content, which significantly enhances the soil's water-holding capacity and infiltration rate.

Question 5

In irrigation management, what does the 'uniformity coefficient' measure?

Accepted Answer

How evenly water is distributed across an irrigated field

Answer

The uniformity coefficient (Christiansen's CU) measures how evenly water is distributed across an irrigated field; higher values indicate more uniform distribution and better system performance.

Agriculture and Environment Practice Test

Agriculture and Environment Practice Test

Agriculture and Environment Water Resources & Irrigation Management 2