Agriculture and Environment Soil Science & Land Management

Question 1

Which soil horizon is known as the 'topsoil' and is most critical for crop production?

Accepted Answer

A horizon

Answer

O horizon

Answer

B horizon

Answer

C horizon

Question 2

What is the primary cause of sheet erosion in agricultural fields?

Accepted Answer

Raindrop impact and surface runoff

Answer

Wind movement

Answer

Freeze-thaw cycles

Answer

Tillage operations

Question 3

Which tillage practice best reduces soil erosion by leaving crop residue on the surface?

Accepted Answer

No-till or conservation tillage

Answer

Moldboard plowing

Answer

Subsoiling

Answer

Deep ripping

Question 4

What does a soil pH of 6.5 indicate?

Accepted Answer

Slightly acidic to neutral soil

Answer

Strongly acidic soil

Answer

Strongly alkaline soil

Answer

Highly saline soil

Question 5

What is the primary benefit of cover crops in US agricultural land management?

Accepted Answer

Preventing soil erosion and improving organic matter

Answer

Increasing soil salinity

Answer

Reducing soil moisture retention

Answer

Eliminating beneficial insects

Question 6

Which USDA classification describes soil with roughly equal parts sand, silt, and clay?

Accepted Answer

Loam

Answer

Sandy loam

Answer

Clay loam

Answer

Silty clay