Question 1

Wind erosion is generally not affected by _____.

Accepted Answer

A)  soil moisture 
B)  soil crusting 
C)  bulk density of the soil 
D)  soil pH 
E)  soil texture 
A)  soil moisture 
B)  soil crusting 
C)  bulk density of the soil 
D)  soil pH 
E)  soil texture

Question 2

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 3

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 4

Conservation tillage systems are now in use on some 75% of the cropland in the USA.

Accepted Answer

A) True 
 B)False

Question 5

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 6

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

Accepted Answer

A) True 
 B)False

Question 7

You have been asked to produce continuous corn on five different soils using both no-till and conventional management systems. Yields on the no-till and conventional-till systems are about the same on all but one of the soils. In which of the following suborders would the poor- performing soil most likely be classified?

Accepted Answer

A)  Orthods 
B)  Eutrox 
C)  Borolls 
D)  Udalfs 
E)  Xerolls 
A)  Orthods 
B)  Eutrox 
C)  Borolls 
D)  Udalfs 
E)  Xerolls

Question 8

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 9

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

Accepted Answer

A) True 
 B)False

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

If you want to maximize the quantity of vegetative cover on soil which of the following tillage practices would you use?

Accepted Answer

A)  conventional moldboard plow 
B)  no-tillage 
C)  ridge tillage
149 
D)  stubble mulch 
E)  strip till 
A)  conventional moldboard plow 
B)  no-tillage 
C)  ridge tillage
149 
D)  stubble mulch 
E)  strip till

Question 12

The R factor of the Universal soil-loss equation is concerned with _____.

Accepted Answer

A)  soil erodibility 
B)  residue cover on the soil 
C)  terraces 
D)  climate 
E)  slope steepness 
A)  soil erodibility 
B)  residue cover on the soil 
C)  terraces 
D)  climate 
E)  slope steepness

Question 13

Although transportation of soil particles in suspension in the atmosphere is very spectacular, less than 40% of the wind erosion losses generally occur in this manner.

Accepted Answer

A) True 
 B)False

Question 14

In the United States, losses of soil due to wind and water erosion decreased by nearly 40% between 1982 and 2003.

Accepted Answer

A) True 
 B)False

Question 15

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 16

The soil erodibility factor in the Universal soil-loss equation (USLE) relates primarily to the soil's infiltration capacity and structural stability.

Accepted Answer

A) True 
 B)False

Question 17

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 18

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

Accepted Answer

A) True 
 B)False

Question 19

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 20

Conservation tillage has generally positive effects on soil physical properties.

Accepted Answer

A) True 
 B)False

Wind erosion is generally not affected by _____.

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

Conservation tillage systems are now in use on some 75% of the cropland in the USA.

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)?

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

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

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

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

If you want to maximize the quantity of vegetative cover on soil which of the following tillage practices would you use?

The R factor of the Universal soil-loss equation is concerned with _____.

Although transportation of soil particles in suspension in the atmosphere is very spectacular, less than 40% of the wind erosion losses generally occur in this manner.

In the United States, losses of soil due to wind and water erosion decreased by nearly 40% between 1982 and 2003.

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

The soil erodibility factor in the Universal soil-loss equation (USLE) relates primarily to the soil's infiltration capacity and structural stability.

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

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

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

Conservation tillage has generally positive effects on soil physical properties.

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, Alkalinity, Aridity and Salinity

Organisms and Ecology of the Soil

Soil Organic Matter Overview

Nutrient Cycles and Soil Fertility

Practical Nutrient Management

Soils and Chemical Pollution

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Exam 14: Soil Erosion and Its Control

Wind erosion is generally not affected by _____.

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

Conservation tillage systems are now in use on some 75% of the cropland in the USA.

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)?

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

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

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

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

If you want to maximize the quantity of vegetative cover on soil which of the following tillage practices would you use?

The R factor of the Universal soil-loss equation is concerned with _____.

Although transportation of soil particles in suspension in the atmosphere is very spectacular, less than 40% of the wind erosion losses generally occur in this manner.

In the United States, losses of soil due to wind and water erosion decreased by nearly 40% between 1982 and 2003.

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

The soil erodibility factor in the Universal soil-loss equation (USLE) relates primarily to the soil's infiltration capacity and structural stability.

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

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

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

Conservation tillage has generally positive effects on soil physical properties.

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, Alkalinity, Aridity and Salinity

Organisms and Ecology of the Soil

Soil Organic Matter Overview

Nutrient Cycles and Soil Fertility

Practical Nutrient Management

Soils and Chemical Pollution

Filters