Agriculture and Environment Soil Science & Land Management 3

Question 1

Which soil texture has the highest water-holding capacity?

Accepted Answer

Clay soil

Answer

Sandy soil

Answer

Silt loam

Answer

Gravel

Question 2

What is the purpose of a soil percolation test in land use planning?

Accepted Answer

To determine how fast water drains through soil for septic system suitability

Answer

To measure soil nutrient levels

Answer

To assess soil compaction depth

Answer

To calculate topsoil depth

Question 3

Which USDA agency maintains the Web Soil Survey, a primary resource for US soil data?

Accepted Answer

Natural Resources Conservation Service (NRCS)

Answer

Agricultural Research Service (ARS)

Answer

Farm Service Agency (FSA)

Answer

Economic Research Service (ERS)

Question 4

What is salinization, and which US region is most affected?

Accepted Answer

Accumulation of salts in soil; western irrigated lands

Answer

Soil acidification; northeastern states

Answer

Soil carbon loss; midwestern states

Answer

Nitrogen leaching; southeastern states

Question 5

What is the role of earthworms in soil health?

Accepted Answer

They improve soil structure, aeration, and nutrient cycling

Answer

They increase soil compaction

Answer

They reduce organic matter decomposition

Answer

They increase soil acidity

Question 6

Which practice involves applying manure or compost to fields to improve soil fertility?

Accepted Answer

Organic amendment application

Answer

Leaching

Answer

Chemical fumigation

Answer

Subsoil irrigation