Question 1

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 2

Conservation tillage systems are said to have all of the following advantages but one over conventional tillage systems

Accepted Answer

A) its labor and energy requirements are lower 
B) it encourages higher microbial population numbers in the soil 
C) it involves the use of less toxic weed control practices 
D) it increases the hydraulic conductivity of the soil 
E) it reduces soil erosion 
A) its labor and energy requirements are lower 
B) it encourages higher microbial population numbers in the soil 
C) it involves the use of less toxic weed control practices 
D) it increases the hydraulic conductivity of the soil 
E) it reduces soil erosion

Question 3

To be classified as a conservation tillage practice, a system must leave at least what portion of the soil surface covered with plant residues?

Accepted Answer

A) 10% 
B) 20% 
C) 30% 
D) 40% 
E) 50% 
A) 10% 
B) 20% 
C) 30% 
D) 40% 
E) 50%

Question 4

Yields of row crops on poorly drained soils are generally somewhat higher with no-tillage systems than with conventional tillage systems.

Accepted Answer

A) True 
 B)False

Question 5

In the U.S.Department of Agriculture's land capability classification systems, some 15% of the Nation's cultivated land is in Class I.

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 T values are the maximum losses of soil by erosion that can be tolerated without a reduction in the soil's long term productivity.

Accepted Answer

A) True 
 B)False

Question 8

"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 9

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

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

Question 13

Some 3/4 of the total soil loss from erosion in the United States is carried away by water.

Accepted Answer

A) True 
 B)False

Question 14

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 15

Saltation is the process of wind movement of salt-affected soils from one location to another in arid regions.

Accepted Answer

A) True 
 B)False

Question 16

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 17

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 18

The P factor in the Universal soil-loss equation is concerned with all but one of the following:

Accepted Answer

A) contour tillage 
B) strip-cropping 
C) soil erodibility 
D) terraces 
E) vegetative covers 
A) contour tillage 
B) strip-cropping 
C) soil erodibility 
D) terraces 
E) vegetative covers

Question 19

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 20

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%

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

Conservation tillage systems are said to have all of the following advantages but one over conventional tillage systems

To be classified as a conservation tillage practice, a system must leave at least what portion of the soil surface covered with plant residues?

Yields of row crops on poorly drained soils are generally somewhat higher with no-tillage systems than with conventional tillage systems.

In the U.S.Department of Agriculture's land capability classification systems, some 15% of the Nation's cultivated land is in Class I.

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

The T values are the maximum losses of soil by erosion that can be tolerated without a reduction in the soil's long term productivity.

"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?

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

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

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

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

Some 3/4 of the total soil loss from erosion in the United States is carried away by water.

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

Saltation is the process of wind movement of salt-affected soils from one location to another in arid regions.

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

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

The P factor in the Universal soil-loss equation is concerned with all but one of the following:

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?

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)?

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

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

Soils and Chemical Pollution

Geographic Soils Information

Prospects for Global Soil Quality

Filters

Exam 17: Soil Erosion and Its Control

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

Conservation tillage systems are said to have all of the following advantages but one over conventional tillage systems

To be classified as a conservation tillage practice, a system must leave at least what portion of the soil surface covered with plant residues?

Yields of row crops on poorly drained soils are generally somewhat higher with no-tillage systems than with conventional tillage systems.

In the U.S.Department of Agriculture's land capability classification systems, some 15% of the Nation's cultivated land is in Class I.

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

The T values are the maximum losses of soil by erosion that can be tolerated without a reduction in the soil's long term productivity.

"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?

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

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

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

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

Some 3/4 of the total soil loss from erosion in the United States is carried away by water.

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

Saltation is the process of wind movement of salt-affected soils from one location to another in arid regions.

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

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

The P factor in the Universal soil-loss equation is concerned with all but one of the following:

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?

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)?

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

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

Soils and Chemical Pollution

Geographic Soils Information

Prospects for Global Soil Quality

Filters