Question 1

Which of the following would you expect to have the highest leaf area index?

Accepted Answer

A) Bare fallowed area 
B) Corn three weeks after planting 
C) Corn, knee high 
D) Alfalfa just before harvest 
E) Either B or C (equal) 
A) Bare fallowed area 
B) Corn three weeks after planting 
C) Corn, knee high 
D) Alfalfa just before harvest 
E) Either B or C (equal) D

Question 2

The average residence time for water in clouds over the ocean is about one year.

Accepted Answer

A) True 
 B)False  False

Question 3

The expression, P - ET -SS estimates the ________ a watershed.

Accepted Answer

A) soil water content of 
B) discharge volume from 
C) evaporation from 
D) interception in 
A) soil water content of 
B) discharge volume from 
C) evaporation from 
D) interception in B

Question 4

Which of the following is not true with respect to the hydrologic cycle?

Accepted Answer

A) More than 85% of the water evaporated from the earth's surface comes from oceans. 
B) There is a net migration of some 40,000 km3 of water in clouds from the land area to the ocean areas. 
C) The average residence time of water in clouds is about 10 days. 
D) Some 78% of the total precipitation falls onto the oceans. 
E) About one third of the readily accessible water in the hydrologic cycle is in the soil. 
A) More than 85% of the water evaporated from the earth's surface comes from oceans. 
B) There is a net migration of some 40,000 km3 of water in clouds from the land area to the ocean areas. 
C) The average residence time of water in clouds is about 10 days. 
D) Some 78% of the total precipitation falls onto the oceans. 
E) About one third of the readily accessible water in the hydrologic cycle is in the soil.

Question 5

Early snowfall that arrives before the cold winter weather has frozen the soil generally increases the penetration of water into the soil.

Accepted Answer

A) True 
 B)False

Question 6

The water potential in soils is generally considered lower than that in the atmosphere.

Accepted Answer

A) True 
 B)False

Question 7

Of the various types of drain systems, open ditch systems are most practical and economical for use on __________.

Accepted Answer

A) Vertisols 
B) soils which do not freeze during the winter 
C) soils with a deep water Table 
D) poorly drained soils with sandy profiles 
E) clay soils with poor drainage 
A) Vertisols 
B) soils which do not freeze during the winter 
C) soils with a deep water Table 
D) poorly drained soils with sandy profiles 
E) clay soils with poor drainage

Question 8

Most irrigation systems are very inefficient with less than half the water that is taken from streams ever reaching the plants.

Accepted Answer

A) True 
 B)False

Question 9

Some 60 percent of the water that is actively involved in the hydrologic cycle worldwide is found in soils.

Accepted Answer

A) True 
 B)False

Question 10

Corn plants are generally more efficient in the use of water than is alfalfa.

Accepted Answer

A) True 
 B)False

Question 11

The pollution of ground water is often increased by the presence of macropores in soils.

Accepted Answer

A) True 
 B)False

Question 12

More than ninety-eight percent of the earth's water does not take part in the annual cycling known as the hydrologic cycle.

Accepted Answer

A) True 
 B)False

Question 13

If you dug a deep hole in your back yard and water started to seep into the hole it would fill the hole up to ________.

Accepted Answer

A) the infiltration rate 
B) the percolation rate 
C) field capacity 
D) the water Table 
E) the liquid limit 
A) the infiltration rate 
B) the percolation rate 
C) field capacity 
D) the water Table 
E) the liquid limit

Question 14

Plant transpiration efficiency at a given location is markedly influenced by _____.

Accepted Answer

A) organic residue cover on the soil 
B) tillage practices used 
C) fertilization practices used 
D) the plant species being grown 
E) both C and D 
A) organic residue cover on the soil 
B) tillage practices used 
C) fertilization practices used 
D) the plant species being grown 
E) both C and D

Question 15

Which of the following sources of water have the shortest average residence time?

Accepted Answer

A) Soil moisture 
B) Clouds. 
C) Oceans and ice caps 
D) groundwater 
A) Soil moisture 
B) Clouds. 
C) Oceans and ice caps 
D) groundwater

Question 16

If the average transpiration (T) loss from leaf surfaces in a particular watershed is 10 mm/day, you expect the evaporation (E) from the soil surface to be _____.

Accepted Answer

A) 10 mm/ day 
B) 5 mm/ day 
C) 15 mm/day 
D) 100 mm/day 
E) Impossible to calculate from the data given 
A) 10 mm/ day 
B) 5 mm/ day 
C) 15 mm/day 
D) 100 mm/day 
E) Impossible to calculate from the data given

Question 17

The water potential at the leaf surfaces expressed in kPa is most likely to be _____.

Accepted Answer

A) -10 
B) 33 
C) -33 
D) -500 
E) -31,000 
A) -10 
B) 33 
C) -33 
D) -500 
E) -31,000

Question 18

Atmospheric vapor pressure has little effect on the vapor losses from soil surfaces.

Accepted Answer

A) True 
 B)False

Question 19

Recent research with annual crops such as wheat, sunflower and sorghum in the Great Plains region suggests that, compared to continuous cropping, soil quality, crop productivity and farm profitability are likely to be greater when crops are grown in a field only every second year with the soil keep free of weeds in the non-crop year by repeated cultivation of herbicide application.

Accepted Answer

A) True 
 B)False

Question 20

Where high-value crops or individual ornamental shrubs are to be grown and water is expensive, the most efficient type of irrigation to use would be ______.

Accepted Answer

A) center pivot 
B) basin flooding 
C) furrow 
D) drip or trickle 
A) center pivot 
B) basin flooding 
C) furrow 
D) drip or trickle

Which of the following would you expect to have the highest leaf area index?

The average residence time for water in clouds over the ocean is about one year.

The expression, P - ET -SS estimates the ________ a watershed.

Which of the following is not true with respect to the hydrologic cycle?

Early snowfall that arrives before the cold winter weather has frozen the soil generally increases the penetration of water into the soil.

The water potential in soils is generally considered lower than that in the atmosphere.

Of the various types of drain systems, open ditch systems are most practical and economical for use on __________.

Most irrigation systems are very inefficient with less than half the water that is taken from streams ever reaching the plants.

Some 60 percent of the water that is actively involved in the hydrologic cycle worldwide is found in soils.

Corn plants are generally more efficient in the use of water than is alfalfa.

The pollution of ground water is often increased by the presence of macropores in soils.

More than ninety-eight percent of the earth's water does not take part in the annual cycling known as the hydrologic cycle.

If you dug a deep hole in your back yard and water started to seep into the hole it would fill the hole up to ________.

Plant transpiration efficiency at a given location is markedly influenced by _____.

Which of the following sources of water have the shortest average residence time?

If the average transpiration (T) loss from leaf surfaces in a particular watershed is 10 mm/day, you expect the evaporation (E) from the soil surface to be _____.

The water potential at the leaf surfaces expressed in kPa is most likely to be _____.

Atmospheric vapor pressure has little effect on the vapor losses from soil surfaces.

Where high-value crops or individual ornamental shrubs are to be grown and water is expensive, the most efficient type of irrigation to use would be ______.

The Soils Around US

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil Water: Characteristics and Behavior

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 6: Soil and the Hydrologic Cycle

Which of the following would you expect to have the highest leaf area index?

The average residence time for water in clouds over the ocean is about one year.

The expression, P - ET -SS estimates the ________ a watershed.

Which of the following is not true with respect to the hydrologic cycle?

Early snowfall that arrives before the cold winter weather has frozen the soil generally increases the penetration of water into the soil.

The water potential in soils is generally considered lower than that in the atmosphere.

Of the various types of drain systems, open ditch systems are most practical and economical for use on __________.

Most irrigation systems are very inefficient with less than half the water that is taken from streams ever reaching the plants.

Some 60 percent of the water that is actively involved in the hydrologic cycle worldwide is found in soils.

Corn plants are generally more efficient in the use of water than is alfalfa.

The pollution of ground water is often increased by the presence of macropores in soils.

More than ninety-eight percent of the earth's water does not take part in the annual cycling known as the hydrologic cycle.

If you dug a deep hole in your back yard and water started to seep into the hole it would fill the hole up to ________.

Plant transpiration efficiency at a given location is markedly influenced by _____.

Which of the following sources of water have the shortest average residence time?

If the average transpiration (T) loss from leaf surfaces in a particular watershed is 10 mm/day, you expect the evaporation (E) from the soil surface to be _____.

The water potential at the leaf surfaces expressed in kPa is most likely to be _____.

Atmospheric vapor pressure has little effect on the vapor losses from soil surfaces.

Where high-value crops or individual ornamental shrubs are to be grown and water is expensive, the most efficient type of irrigation to use would be ______.

The Soils Around US

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil Water: Characteristics and Behavior

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