Question 1

Which of the following statements about soil erosion is not true?

Accepted Answer

A) Soil erosion losses per hectare of cropped land are higher in Asia and Africa than the United States. 
B) The rate of soil erosion loss in the United States declined from 1980 to 1995. 
C) Downstream off-site costs of erosion are often higher than those in upstream fields from which the soil came. 
D) Soil erosion losses of potassium exceed those of nitrogen and phosphorus. 
E) Less than 20 percent of the total soil erosion in the United States comes from croplands. 
A) Soil erosion losses per hectare of cropped land are higher in Asia and Africa than the United States. 
B) The rate of soil erosion loss in the United States declined from 1980 to 1995. 
C) Downstream off-site costs of erosion are often higher than those in upstream fields from which the soil came. 
D) Soil erosion losses of potassium exceed those of nitrogen and phosphorus. 
E) Less than 20 percent of the total soil erosion in the United States comes from croplands.

Question 2

The total global soil lost through erosion is generally greater from gully erosion than from sheet erosion.

Accepted Answer

A) True 
 B)False

Question 3

In explaining erosion processes to a friend,which of the following would you say about accelerated erosion?

Accepted Answer

A) It refers to sediment carried by water flowing at ever greater velocity. 
B) It involves a much less rapid process than geological erosion. 
C) It is greatly enhanced by the splash effect of raindrops impacting bare soil. 
D) It is increasing in intensity in the United States,especially in the past 10 years. 
E) it removes more nitrogen from the surface soil than calcium 
A) It refers to sediment carried by water flowing at ever greater velocity. 
B) It involves a much less rapid process than geological erosion. 
C) It is greatly enhanced by the splash effect of raindrops impacting bare soil. 
D) It is increasing in intensity in the United States,especially in the past 10 years. 
E) it removes more nitrogen from the surface soil than calcium

Question 4

The revised universal soil-loss equation (RUSLE)differs from USLE in all ways but one of the following.

Accepted Answer

A) reflects the effects of raindrops striking the soil 
B) accounts for seasonal changes such as freezing and thawing 
C) divides the year into 15 day intervals for the cropping sequence factor 
D) uses greatly modified soil erodibility factors 
E) considers the effects of surface or near-surface residues at different times of the year 
A) reflects the effects of raindrops striking the soil 
B) accounts for seasonal changes such as freezing and thawing 
C) divides the year into 15 day intervals for the cropping sequence factor 
D) uses greatly modified soil erodibility factors 
E) considers the effects of surface or near-surface residues at different times of the year

Question 5

Annual soil movement due to tillage erosion can be calculated using a simple function of the type of tillage being used and the landscape erodibility.

Accepted Answer

A) True 
 B)False

Question 6

Ridge-till systems show promise in the management of somewhat poorly drained soils of the Midwest.

Accepted Answer

A) True 
 B)False

Question 7

The U.S.Department of Agriculture has developed soil-loss tolerance limits (T values)for different soils.Which of the following is the highest T value assigned for most soils in this country (Mg/ha)?

Accepted Answer

A) 5.0 
B) 15 
C) 11 
D) 20 
E) 2 
A) 5.0 
B) 15 
C) 11 
D) 20 
E) 2

Question 8

Soils in Land Capability Class VIII areas are less subject to erosion than any other class.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following statements is true?

Accepted Answer

A) Sheet erosion is most obvious from a distance. 
B) Gully erosion carries the most sediment away from lands in the United States. 
C) Rill erosion is the most serious in forested areas. 
D) Rill erosion is initiated before water concentrates in small 1-2 cm channels. 
E) Rill erosion channels can be removed by ordinary cultivation. 
A) Sheet erosion is most obvious from a distance. 
B) Gully erosion carries the most sediment away from lands in the United States. 
C) Rill erosion is the most serious in forested areas. 
D) Rill erosion is initiated before water concentrates in small 1-2 cm channels. 
E) Rill erosion channels can be removed by ordinary cultivation.

Question 10

Compared to conventional tillage systems,most conservation tillage systems rely more heavily on herbicides to control weeds.

Accepted Answer

A) True 
 B)False

Question 11

Which of the USDA land use capability classes (LUC)is most suitable for the production of row crops?

Accepted Answer

A) I 
B) II 
C) VI 
D) IV 
E) VIII 
A) I 
B) II 
C) VI 
D) IV 
E) VIII

Question 12

Hydraulic conductivity is commonly higher in soils on which conventional tillage systems have been used than where no-tillage systems have been followed.

Accepted Answer

A) True 
 B)False

Question 13

Vegetative barriers planted on the contour have been found to create low-cost "natural" terraces.

Accepted Answer

A) True 
 B)False

Question 14

Slope length is generally of greater significance in determining erosion rate than is steepness of slope.

Accepted Answer

A) True 
 B)False

Question 15

About what percentage of the total non-federal government owned rural lands is considered suitable for cultivation according to USDA land use capability classes (if appropriate management practices are employed)?

Accepted Answer

A) 75% 
B) 55% 
C) 35% 
D) 20% 
E) 2% 
A) 75% 
B) 55% 
C) 35% 
D) 20% 
E) 2%

Question 16

Conservation tillage has generally positive effects on soil physical properties.

Accepted Answer

A) True 
 B)False

Question 17

"Living" terraces involving rows of deep rooted grasses planted on the contour would be considered as contributing to which factor in the Universal soil-loss equation?

Accepted Answer

A) R 
B) K 
C) L 
D) S 
E) P 
A) R 
B) K 
C) L 
D) S 
E) P

Question 18

In one field trial comparing no-till and conventional tillage,soil samples taken after 15 years without liming revealed that the pH of the upper 15 cm was lower on the no-till plot than on the conventional plot.Which of the following most likely accounts for this difference?

Accepted Answer

A) organic decomposition produced more organic acids in the no-till plot 
B) earthworms were more active in the no-till plot 
C) acidifying effects of nitrogen-containing fertilizers 
D) Al3+ ions are tied up by the organic matter thereby releasing H+ ions 
E) plowing mixes the surface soil more thoroughly 
A) organic decomposition produced more organic acids in the no-till plot 
B) earthworms were more active in the no-till plot 
C) acidifying effects of nitrogen-containing fertilizers 
D) Al3+ ions are tied up by the organic matter thereby releasing H+ ions 
E) plowing mixes the surface soil more thoroughly

Question 19

The key to preventing soil erosion by water on both farmland and landscaping job sites is ____.

Accepted Answer

A) To keep the soil surface covered with vegetation. 
B) To provide adequate surface and subsurface drainage. 
C) To grade or till the soil until a smooth surface is achieved. 
D) To keep the soil moist (with irrigation if necessary). 
E) To practice good landscape sanitation by clearing away any weeds and old plant residues. 
A) To keep the soil surface covered with vegetation. 
B) To provide adequate surface and subsurface drainage. 
C) To grade or till the soil until a smooth surface is achieved. 
D) To keep the soil moist (with irrigation if necessary). 
E) To practice good landscape sanitation by clearing away any weeds and old plant residues.

Question 20

On which of the land use capability classes is suggested use restricted to non-production purposes,only wildlife and recreational purposes being appropriate?

Accepted Answer

A) I 
B) II 
C) VI 
D) IV 
E) VIII 
A) I 
B) II 
C) VI 
D) IV 
E) VIII

Which of the following statements about soil erosion is not true?

The total global soil lost through erosion is generally greater from gully erosion than from sheet erosion.

In explaining erosion processes to a friend,which of the following would you say about accelerated erosion?

The revised universal soil-loss equation (RUSLE)differs from USLE in all ways but one of the following.

Annual soil movement due to tillage erosion can be calculated using a simple function of the type of tillage being used and the landscape erodibility.

Ridge-till systems show promise in the management of somewhat poorly drained soils of the Midwest.

The U.S.Department of Agriculture has developed soil-loss tolerance limits (T values)for different soils.Which of the following is the highest T value assigned for most soils in this country (Mg/ha)?

Soils in Land Capability Class VIII areas are less subject to erosion than any other class.

Which of the following statements is true?

Compared to conventional tillage systems,most conservation tillage systems rely more heavily on herbicides to control weeds.

Which of the USDA land use capability classes (LUC)is most suitable for the production of row crops?

Hydraulic conductivity is commonly higher in soils on which conventional tillage systems have been used than where no-tillage systems have been followed.

Vegetative barriers planted on the contour have been found to create low-cost "natural" terraces.

Slope length is generally of greater significance in determining erosion rate than is steepness of slope.

About what percentage of the total non-federal government owned rural lands is considered suitable for cultivation according to USDA land use capability classes (if appropriate management practices are employed)?

Conservation tillage has generally positive effects on soil physical properties.

"Living" terraces involving rows of deep rooted grasses planted on the contour would be considered as contributing to which factor in the Universal soil-loss equation?

In one field trial comparing no-till and conventional tillage,soil samples taken after 15 years without liming revealed that the pH of the upper 15 cm was lower on the no-till plot than on the conventional plot.Which of the following most likely accounts for this difference?

The key to preventing soil erosion by water on both farmland and landscaping job sites is ____.

On which of the land use capability classes is suggested use restricted to non-production purposes,only wildlife and recreational purposes being appropriate?

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 Aeration and Temperature

The Colloidal Fraction: Seat of Soil Chemical and Physical Activity

Soil Acidity

Soils of Dry Regionsalkalinity,salinity and Sodicity

Organisms and Ecology of the Soil

Soil Organic Matter

Nitrogen and Sulfur Economy of Soils

Soil Phosphorus and Potassium

Calcium,magnesium and Trace Elements

Practical Nutrient Management

Soils and Chemical Pollution

Geographic Information About Soils

Prospects for Global Soil Quality As Affected by Human Activities

Filters

Exam 17: Soil Erosion and Its Control

Which of the following statements about soil erosion is not true?

The total global soil lost through erosion is generally greater from gully erosion than from sheet erosion.

In explaining erosion processes to a friend,which of the following would you say about accelerated erosion?

The revised universal soil-loss equation (RUSLE)differs from USLE in all ways but one of the following.

Annual soil movement due to tillage erosion can be calculated using a simple function of the type of tillage being used and the landscape erodibility.

Ridge-till systems show promise in the management of somewhat poorly drained soils of the Midwest.

The U.S.Department of Agriculture has developed soil-loss tolerance limits (T values)for different soils.Which of the following is the highest T value assigned for most soils in this country (Mg/ha)?

Soils in Land Capability Class VIII areas are less subject to erosion than any other class.

Which of the following statements is true?

Compared to conventional tillage systems,most conservation tillage systems rely more heavily on herbicides to control weeds.

Which of the USDA land use capability classes (LUC)is most suitable for the production of row crops?

Hydraulic conductivity is commonly higher in soils on which conventional tillage systems have been used than where no-tillage systems have been followed.

Vegetative barriers planted on the contour have been found to create low-cost "natural" terraces.

Slope length is generally of greater significance in determining erosion rate than is steepness of slope.

About what percentage of the total non-federal government owned rural lands is considered suitable for cultivation according to USDA land use capability classes (if appropriate management practices are employed)?

Conservation tillage has generally positive effects on soil physical properties.

"Living" terraces involving rows of deep rooted grasses planted on the contour would be considered as contributing to which factor in the Universal soil-loss equation?

In one field trial comparing no-till and conventional tillage,soil samples taken after 15 years without liming revealed that the pH of the upper 15 cm was lower on the no-till plot than on the conventional plot.Which of the following most likely accounts for this difference?

The key to preventing soil erosion by water on both farmland and landscaping job sites is ____.

On which of the land use capability classes is suggested use restricted to non-production purposes,only wildlife and recreational purposes being appropriate?

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 Aeration and Temperature

The Colloidal Fraction: Seat of Soil Chemical and Physical Activity

Soil Acidity

Soils of Dry Regionsalkalinity,salinity and Sodicity

Organisms and Ecology of the Soil

Soil Organic Matter

Nitrogen and Sulfur Economy of Soils

Soil Phosphorus and Potassium

Calcium,magnesium and Trace Elements

Practical Nutrient Management

Soils and Chemical Pollution

Geographic Information About Soils

Prospects for Global Soil Quality As Affected by Human Activities

Filters