Question 1

The redox potential of a soil is -250 mV.Which of the following forms of the pertinent elements would you expect to find in the soil?

Accepted Answer

A) NO3- 
B) SO42- 
C) Fe2+ 
D) Mn4+ 
E) CO2 
A) NO3- 
B) SO42- 
C) Fe2+ 
D) Mn4+ 
E) CO2 C

Question 2

Some 40 to 50% of the solar radiation in humid regions is used to heat the soil.

Accepted Answer

A) True 
 B)False  False

Question 3

An abundance of macropores in soils helps assure an abundance of oxygen in the soil.

Accepted Answer

A) True 
 B)False  True

Question 4

A well aerated soil is characterized by a relative abundance of _____.

Accepted Answer

A) micropores 
B) Fe2+ions 
C) NH4+ ions 
D) NO3- ions 
E) methane gas 
A) micropores 
B) Fe2+ions 
C) NH4+ ions 
D) NO3- ions 
E) methane gas

Question 5

The partial pressure of oxygen in the atmosphere is 0.21 bar and that of nitrogen 0.78.Which of the following partial pressure levels would you expect to find in the pores of a moderately well-drained soil?

Accepted Answer

A) 0.21 (oxygen) 
B) 0.80 (nitrogen) 
C) 0.30 (oxygen) 
D) 0.50 (nitrogen) 
E) 0.15 (oxygen) 
A) 0.21 (oxygen) 
B) 0.80 (nitrogen) 
C) 0.30 (oxygen) 
D) 0.50 (nitrogen) 
E) 0.15 (oxygen)

Question 6

Which of the following is not a major factor in determining the soil aeration status?

Accepted Answer

A) redox potential 
B) volume of macropores 
C) nitrogen gas 
D) carbon dioxide 
E) oxygen 
A) redox potential 
B) volume of macropores 
C) nitrogen gas 
D) carbon dioxide 
E) oxygen

Question 7

In natural wetlands one would expect the redox potential to be high because of the low oxygen content.

Accepted Answer

A) True 
 B)False

Question 8

Wildfires in forested areas result in the formation of organic compounds that enhance the percolation of water through the soil.

Accepted Answer

A) True 
 B)False

Question 9

If the CO2 content of soil air is 3.5%, it is 100 times higher than that of the atmosphere.

Accepted Answer

A) True 
 B)False

Question 10

The following is the reduced form of the essential element depicted

Accepted Answer

A) NH4+ 
B) Fe3+ 
C) CO2 
D) SO42- 
E) Mn4+ 
A) NH4+ 
B) Fe3+ 
C) CO2 
D) SO42- 
E) Mn4+

Question 11

Conservation tillage is not practical in some areas of the Northern part of the United States because the practice lowers the surface soil temperature in the spring of the year.

Accepted Answer

A) True 
 B)False

Question 12

The most important management factors influencing soil aeration in well-drained soils are those that determine the volume of the soil's macropores.

Accepted Answer

A) True 
 B)False

Question 13

Soil A has a redox potential of 400 mV, soil B -200 mV.Of the two soils, Soil A is more apt to be characterized by an abundance of _____.

Accepted Answer

A) Fe2+ ions 
B) Mn2+ ions 
C) H+ ions 
D) S2- ions 
E) molecular oxygen 
A) Fe2+ ions 
B) Mn2+ ions 
C) H+ ions 
D) S2- ions 
E) molecular oxygen

Question 14

Which of the following processes are most apt to encourage good soil aeration?

Accepted Answer

A) root respiration 
B) organic matter decomposition 
C) diffusion of oxygen from the soil to the atmosphere 
D) creation of more macropores 
E) reaction of oxygen with organic matter 
A) root respiration 
B) organic matter decomposition 
C) diffusion of oxygen from the soil to the atmosphere 
D) creation of more macropores 
E) reaction of oxygen with organic matter

Question 15

The redox potential is a measure of _____.

Accepted Answer

A) molecular oxygen content 
B) the tendency of a substance to accept or donate electrons 
C) carbon dioxide content 
D) the ferric ion content 
E) the balance between hydrogen and hydroxyl ions in solution. 
A) molecular oxygen content 
B) the tendency of a substance to accept or donate electrons 
C) carbon dioxide content 
D) the ferric ion content 
E) the balance between hydrogen and hydroxyl ions in solution.

Question 16

Which of the following is (are) considered necessary features for an area to be delineated as a wetland?

Accepted Answer

A) hydric soils 
B) shallow standing water 
C) aquatic vegetation 
D) organic soils 
E) all of the above 
A) hydric soils 
B) shallow standing water 
C) aquatic vegetation 
D) organic soils 
E) all of the above

Question 17

The great bulk of gaseous interchange between the soil pores and the atmosphere occurs by mass flow of the concerned gases.

Accepted Answer

A) True 
 B)False

Question 18

Compared to upland soils, wetland soils would be characterized by an abundance of _____.

Accepted Answer

A) methane 
B) CO2 
C) NO3- 
D) SO42- 
E) Fe3+ 
A) methane 
B) CO2 
C) NO3- 
D) SO42- 
E) Fe3+

Question 19

You would expect the installation of an effective tile drainage system in a naturally poorly drained soil in Iowa to increase soil temperatures in the spring of the year.

Accepted Answer

A) True 
 B)False

Question 20

The redox potential is a measure of the tendency of a substance to accept or donate electrons.

Accepted Answer

A) True 
 B)False

The redox potential of a soil is -250 mV.Which of the following forms of the pertinent elements would you expect to find in the soil?

Some 40 to 50% of the solar radiation in humid regions is used to heat the soil.

An abundance of macropores in soils helps assure an abundance of oxygen in the soil.

A well aerated soil is characterized by a relative abundance of _____.

The partial pressure of oxygen in the atmosphere is 0.21 bar and that of nitrogen 0.78.Which of the following partial pressure levels would you expect to find in the pores of a moderately well-drained soil?

Which of the following is not a major factor in determining the soil aeration status?

In natural wetlands one would expect the redox potential to be high because of the low oxygen content.

Wildfires in forested areas result in the formation of organic compounds that enhance the percolation of water through the soil.

If the CO₂ content of soil air is 3.5%, it is 100 times higher than that of the atmosphere.

The following is the reduced form of the essential element depicted

Conservation tillage is not practical in some areas of the Northern part of the United States because the practice lowers the surface soil temperature in the spring of the year.

The most important management factors influencing soil aeration in well-drained soils are those that determine the volume of the soil's macropores.

Soil A has a redox potential of 400 mV, soil B -200 mV.Of the two soils, Soil A is more apt to be characterized by an abundance of _____.

Which of the following processes are most apt to encourage good soil aeration?

The redox potential is a measure of _____.

Which of the following is (are) considered necessary features for an area to be delineated as a wetland?

The great bulk of gaseous interchange between the soil pores and the atmosphere occurs by mass flow of the concerned gases.

Compared to upland soils, wetland soils would be characterized by an abundance of _____.

You would expect the installation of an effective tile drainage system in a naturally poorly drained soil in Iowa to increase soil temperatures in the spring of the year.

The redox potential is a measure of the tendency of a substance to accept or donate electrons.

The Soils Around US

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil Water: Characteristics and Behavior

Soil and the Hydrologic Cycle

Soil Colloids: Seat of Soil Chemical and Physical Activity

Soil Acidity

Soils of Dry Regions: Alkalinity, Salinity, and Sodicity

Organisms and Ecology of the Soil

Soil Organic Matter

Nitrogen and Sulfur Economy of Soils

Soil Phosphorus and Potassium

Micronutrients and Other Trace Elements

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

Geographic Soils Information

Prospects for Global Soil Quality

Filters

Exam 7: Soil Aeration and Temperature

The redox potential of a soil is -250 mV.Which of the following forms of the pertinent elements would you expect to find in the soil?

Some 40 to 50% of the solar radiation in humid regions is used to heat the soil.

An abundance of macropores in soils helps assure an abundance of oxygen in the soil.

A well aerated soil is characterized by a relative abundance of _____.

The partial pressure of oxygen in the atmosphere is 0.21 bar and that of nitrogen 0.78.Which of the following partial pressure levels would you expect to find in the pores of a moderately well-drained soil?

Which of the following is not a major factor in determining the soil aeration status?

In natural wetlands one would expect the redox potential to be high because of the low oxygen content.

Wildfires in forested areas result in the formation of organic compounds that enhance the percolation of water through the soil.

If the CO2 content of soil air is 3.5%, it is 100 times higher than that of the atmosphere.

The following is the reduced form of the essential element depicted

Conservation tillage is not practical in some areas of the Northern part of the United States because the practice lowers the surface soil temperature in the spring of the year.

The most important management factors influencing soil aeration in well-drained soils are those that determine the volume of the soil's macropores.

Soil A has a redox potential of 400 mV, soil B -200 mV.Of the two soils, Soil A is more apt to be characterized by an abundance of _____.

Which of the following processes are most apt to encourage good soil aeration?

The redox potential is a measure of _____.

Which of the following is (are) considered necessary features for an area to be delineated as a wetland?

The great bulk of gaseous interchange between the soil pores and the atmosphere occurs by mass flow of the concerned gases.

Compared to upland soils, wetland soils would be characterized by an abundance of _____.

You would expect the installation of an effective tile drainage system in a naturally poorly drained soil in Iowa to increase soil temperatures in the spring of the year.

The redox potential is a measure of the tendency of a substance to accept or donate electrons.

The Soils Around US

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil Water: Characteristics and Behavior

Soil and the Hydrologic Cycle

Soil Colloids: Seat of Soil Chemical and Physical Activity

Soil Acidity

Soils of Dry Regions: Alkalinity, Salinity, and Sodicity

Organisms and Ecology of the Soil

Soil Organic Matter

Nitrogen and Sulfur Economy of Soils

Soil Phosphorus and Potassium

Micronutrients and Other Trace Elements

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

Geographic Soils Information

Prospects for Global Soil Quality

Filters

If the CO₂ content of soil air is 3.5%, it is 100 times higher than that of the atmosphere.