Agriculture and Environment Soil Science & Land Management 3

Question 1

Which soil texture has the highest water-holding capacity?

Accepted Answer

Clay soil

Answer

Clay soils have the highest water-holding capacity due to their small particle size, large surface area, and high proportion of micropores.

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

A percolation (perc) test measures the rate at which water drains through soil, which determines if land can support a septic system.

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

The NRCS manages the Web Soil Survey, which provides free access to soil maps and data for over 95% of US counties.

Question 4

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

Accepted Answer

Accumulation of salts in soil; western irrigated lands

Answer

Salinization is the buildup of salts in soil from irrigation water evaporation, most prevalent in western US irrigated agricultural regions like California's Central Valley.

Question 5

What is the role of earthworms in soil health?

Accepted Answer

They improve soil structure, aeration, and nutrient cycling

Answer

Earthworms improve soil structure by creating channels that enhance aeration and water infiltration, and their castings add nutrients and beneficial microbes.

Agriculture and Environment Practice Test

Agriculture and Environment Practice Test

Agriculture and Environment Soil Science & Land Management 3