Question 1

In which of the following "forms" of soil water are pesticides, excess plant nutrients and waste chemicals most apt to move through soils?

Accepted Answer

A) gravitational 
B) unsaturated 
C) available 
D) hygroscopic 
E) capillary 
A) gravitational 
B) unsaturated 
C) available 
D) hygroscopic 
E) capillary A

Question 2

Water molecules have polarity primarily because each contains two H atoms and only one O atom.

Accepted Answer

A) True 
 B)False  False

Question 3

Hysteresis is the phenomenon whereby a soil has the same water content/potential relationship when it is being dried as when it is being wetted.

Accepted Answer

A) True 
 B)False  False

Question 4

The osmotic potential would likely be lowest in soils of which of the following orders

Accepted Answer

A) Aridisols 
B) Histosols 
C) Oxisols 
D) Ultisols 
E) Spodosols 
A) Aridisols 
B) Histosols 
C) Oxisols 
D) Ultisols 
E) Spodosols

Question 5

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the electrical resistance block?

Accepted Answer

A) requires "destructive sampling" for each measurement 
B) good to turn on automatic irrigation at -50 kPa 
C) used to turn on irrigation when soil moisture potential reaches -200 kPa 
D) would give the same reading for both a loamy sand and a silt loam if both contained 15% moisture 
E) both A and D 
A) requires "destructive sampling" for each measurement 
B) good to turn on automatic irrigation at -50 kPa 
C) used to turn on irrigation when soil moisture potential reaches -200 kPa 
D) would give the same reading for both a loamy sand and a silt loam if both contained 15% moisture 
E) both A and D

Question 6

Two soil samples, A & B, at different soil moisture levels are placed in contact with each other.Water will more likely move from soil A to soil B if their water potentials, expressed in kPa, are:

Accepted Answer

A) A=-5; B=+5 
B) A=-5; B=-5 
C) A=-20; B=-10 
D) A=-30; B=-40 
E) A=-100; B=-50 
A) A=-5; B=+5 
B) A=-5; B=-5 
C) A=-20; B=-10 
D) A=-30; B=-40 
E) A=-100; B=-50

Question 7

The property of cohesion in water stems from the attraction of water molecules for soil solids.

Accepted Answer

A) True 
 B)False

Question 8

The polarity of water helps account for the attraction of water molecules for each other.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following best characterizes the field capacity of a soil?

Accepted Answer

A) maximum capacity of a soil to hold water 
B) water content of a soil with water potential of about -10 kPa 
C) the total capillary water in a soil 
D) a wetted soil prior to the removal of the gravitational water 
E) soil with water potential of -1500 kPa 
A) maximum capacity of a soil to hold water 
B) water content of a soil with water potential of about -10 kPa 
C) the total capillary water in a soil 
D) a wetted soil prior to the removal of the gravitational water 
E) soil with water potential of -1500 kPa

Question 10

In which of the following situations would you expect downward movement of soil water through the profile to be most rapid?

Accepted Answer

A) uniformly textured sandy loam profile 
B) sandy loam in upper layers with a clay band underneath 
C) sandy loam in upper layers with a layer of coarse gravel underneath 
D) clay texture throughout the profile 
E) silt loam in upper layers underlain by a sandy layer 
A) uniformly textured sandy loam profile 
B) sandy loam in upper layers with a clay band underneath 
C) sandy loam in upper layers with a layer of coarse gravel underneath 
D) clay texture throughout the profile 
E) silt loam in upper layers underlain by a sandy layer

Question 11

Plant roots gain access to soil water primarily by the growth of the roots into moist soil.

Accepted Answer

A) True 
 B)False

Question 12

The matric potential is due to the attraction of water molecules to soil solid surfaces.

Accepted Answer

A) True 
 B)False

Question 13

The adsorption of water on soil surfaces encourages capillarity.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the neutron probe?

Accepted Answer

A) requires "destructive sampling" for each measurement 
B) good to turn on automatic irrigation at -50 kPa 
C) used to turn on irrigation when soil moisture potential reaches -200 kPa 
D) would give the same reading for both a loamy sand and a silt loam if both contained 15% moisture 
E) both A and D 
A) requires "destructive sampling" for each measurement 
B) good to turn on automatic irrigation at -50 kPa 
C) used to turn on irrigation when soil moisture potential reaches -200 kPa 
D) would give the same reading for both a loamy sand and a silt loam if both contained 15% moisture 
E) both A and D

Question 15

At which of the following soil moisture potentials (expressed as kPa) is the waters' energy level lowest?

Accepted Answer

A) +5 
B) 0 
C) -31 
D) -1500 
E) -3100 
A) +5 
B) 0 
C) -31 
D) -1500 
E) -3100

Question 16

The magnetic resonance technique of estimating soil moisture levels can also be used to estimate salt contents.

Accepted Answer

A) True 
 B)False

Question 17

Although the total soil water content of a clay soil is about the same as a nearby well structured silt loam, the clay will likely provide more available water to plants because of its higher volume of small pores.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the tensiometer?

Accepted Answer

A) requires "destructive sampling" for each measurement 
B) good to turn on automatic irrigation at -50 kPa 
C) used to turn on irrigation when soil moisture potential reaches -200 kPa 
D) would give the same reading for both a loamy sand and a silt loam if both contained 15% moisture 
E) both A and D 
A) requires "destructive sampling" for each measurement 
B) good to turn on automatic irrigation at -50 kPa 
C) used to turn on irrigation when soil moisture potential reaches -200 kPa 
D) would give the same reading for both a loamy sand and a silt loam if both contained 15% moisture 
E) both A and D

Question 19

The soil water potential is a measure of the potential of a soil to hold water.

Accepted Answer

A) True 
 B)False

Question 20

Water will move from one site in a soil with a water potential of -5 kPa to an adjacent site with a water potential of -40 kPa.

Accepted Answer

A) True 
 B)False

In which of the following "forms" of soil water are pesticides, excess plant nutrients and waste chemicals most apt to move through soils?

Water molecules have polarity primarily because each contains two H atoms and only one O atom.

Hysteresis is the phenomenon whereby a soil has the same water content/potential relationship when it is being dried as when it is being wetted.

The osmotic potential would likely be lowest in soils of which of the following orders

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the electrical resistance block?

Two soil samples, A & B, at different soil moisture levels are placed in contact with each other.Water will more likely move from soil A to soil B if their water potentials, expressed in kPa, are:

The property of cohesion in water stems from the attraction of water molecules for soil solids.

The polarity of water helps account for the attraction of water molecules for each other.

Which of the following best characterizes the field capacity of a soil?

In which of the following situations would you expect downward movement of soil water through the profile to be most rapid?

Plant roots gain access to soil water primarily by the growth of the roots into moist soil.

The matric potential is due to the attraction of water molecules to soil solid surfaces.

The adsorption of water on soil surfaces encourages capillarity.

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the neutron probe?

At which of the following soil moisture potentials (expressed as kPa) is the waters' energy level lowest?

The magnetic resonance technique of estimating soil moisture levels can also be used to estimate salt contents.

Although the total soil water content of a clay soil is about the same as a nearby well structured silt loam, the clay will likely provide more available water to plants because of its higher volume of small pores.

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the tensiometer?

The soil water potential is a measure of the potential of a soil to hold water.

Water will move from one site in a soil with a water potential of -5 kPa to an adjacent site with a water potential of -40 kPa.

The Soils Around US

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil and the Hydrologic Cycle

Soil Aeration and Temperature

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 5: Soil Water: Characteristics and Behavior

In which of the following "forms" of soil water are pesticides, excess plant nutrients and waste chemicals most apt to move through soils?

Water molecules have polarity primarily because each contains two H atoms and only one O atom.

Hysteresis is the phenomenon whereby a soil has the same water content/potential relationship when it is being dried as when it is being wetted.

The osmotic potential would likely be lowest in soils of which of the following orders

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the electrical resistance block?

Two soil samples, A & B, at different soil moisture levels are placed in contact with each other.Water will more likely move from soil A to soil B if their water potentials, expressed in kPa, are:

The property of cohesion in water stems from the attraction of water molecules for soil solids.

The polarity of water helps account for the attraction of water molecules for each other.

Which of the following best characterizes the field capacity of a soil?

In which of the following situations would you expect downward movement of soil water through the profile to be most rapid?

Plant roots gain access to soil water primarily by the growth of the roots into moist soil.

The matric potential is due to the attraction of water molecules to soil solid surfaces.

The adsorption of water on soil surfaces encourages capillarity.

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the neutron probe?

At which of the following soil moisture potentials (expressed as kPa) is the waters' energy level lowest?

The magnetic resonance technique of estimating soil moisture levels can also be used to estimate salt contents.

Although the total soil water content of a clay soil is about the same as a nearby well structured silt loam, the clay will likely provide more available water to plants because of its higher volume of small pores.

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the tensiometer?

The soil water potential is a measure of the potential of a soil to hold water.

Water will move from one site in a soil with a water potential of -5 kPa to an adjacent site with a water potential of -40 kPa.

The Soils Around US

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil and the Hydrologic Cycle

Soil Aeration and Temperature

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