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

The A horizon (topsoil) contains the highest concentration of organic matter and nutrients, making it most important for plant growth.

Question 2

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

Accepted Answer

Raindrop impact and surface runoff

Answer

Sheet erosion is caused by raindrop impact dislodging soil particles combined with thin, uniform surface runoff carrying them away.

Question 3

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

Accepted Answer

No-till or conservation tillage

Answer

No-till and conservation tillage practices leave crop residues on the soil surface, protecting it from erosion and improving water infiltration.

Question 4

What does a soil pH of 6.5 indicate?

Accepted Answer

Slightly acidic to neutral soil

Answer

A pH of 6.5 is slightly acidic to near-neutral, which is optimal for most crops as it maximizes nutrient availability.

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

Cover crops protect soil from erosion, add organic matter when tilled under, and improve soil structure and fertility.

Agriculture and Environment Practice Test