Question 1

Forests in decline because of acid deposition can often be brought back to high productivity with just a few applications of nitrogen fertilizer.

Accepted Answer

A) True 
 B)False  False

Question 2

Ammonia losses are likely to be greatest if a nitrogen source is placed about 10 cm deep in ____

Accepted Answer

A) an acid,sandy loam soil 
B) a calcareous sandy loam soil 
C) an acid,clay loam soil 
D) a calcareous clay loam soil 
A) an acid,sandy loam soil 
B) a calcareous sandy loam soil 
C) an acid,clay loam soil 
D) a calcareous clay loam soil B

Question 3

Ammonia losses from the shallow,algae-filled water of a non-tidal wetland are likely to be much greater at night than during the day.

Accepted Answer

A) True 
 B)False  False

Question 4

Nitrogen is a component of which essential plant compounds?

Accepted Answer

A) proteins 
B) chlorophyll 
C) enzymes 
D) DNA 
E) all of the above 
A) proteins 
B) chlorophyll 
C) enzymes 
D) DNA 
E) all of the above

Question 5

Nitric acid deposited on forest soils with "acid rain" can increase the leaching of nutrient cations.

Accepted Answer

A) True 
 B)False

Question 6

Methemoglobinemia is principally a potential threat to _____.

Accepted Answer

A) babies drinking water high in sulfate 
B) adults drinking water high in sulfate 
C) babies drinking water high in nitrate 
D) adults drinking water high in nitrate 
E) all of the above 
A) babies drinking water high in sulfate 
B) adults drinking water high in sulfate 
C) babies drinking water high in nitrate 
D) adults drinking water high in nitrate 
E) all of the above

Question 7

In most temperate,humid regions,the period of greatest potential for nitrate leaching is during the summer when nitrogen fertilizer is applied to crops.

Accepted Answer

A) True 
 B)False

Question 8

Plants obtain nitrogen from the soil by taking up ______.

Accepted Answer

A) soluble anions 
B) soluble cations 
C) soluble organic compounds 
D) all of the above 
E) none of the above 
A) soluble anions 
B) soluble cations 
C) soluble organic compounds 
D) all of the above 
E) none of the above

Question 9

Although slow release fertilizers take longer to have an effect,they are more economical than regular nitrogen fertilizers and so are favored by foresters and farmers.

Accepted Answer

A) True 
 B)False

Question 10

On the average,agricultural soils in the US are currently being depleted of their nitrogen supply.

Accepted Answer

A) True 
 B)False

Question 11

Soluble organic N compounds are taken up by plants and are lost in leaching and runoff waters.

Accepted Answer

A) True 
 B)False

Question 12

By converting nitrite to ammonium,the anaerobic process of anammox increases nitrogen losses through volatilization of ammonia gas.

Accepted Answer

A) True 
 B)False

Question 13

Because of _______,soils developed in marine marshes can become extremely acid if drained for agriculture or used as topsoil.

Accepted Answer

A) oxidation of sulfates 
B) reduction of sulfates 
C) oxidation of sulfides 
D) reduction of elemental sulfur 
E) all of the above 
A) oxidation of sulfates 
B) reduction of sulfates 
C) oxidation of sulfides 
D) reduction of elemental sulfur 
E) all of the above

Question 14

Ammonium fixation would be expected to be greatest in soils containing a lot of______.

Accepted Answer

A) Rhizobium bacteria 
B) Frankia 
C) vermiculite 
D) iron oxides 
E) both C and D 
A) Rhizobium bacteria 
B) Frankia 
C) vermiculite 
D) iron oxides 
E) both C and D

Question 15

Grass clippings from a healthy lawn can be expected to contain approximately ___% N (on a dry weight basis).

Accepted Answer

A) 0.01 
B) 0.2 
C) 0.5 
D) 3.0 
E) 7.5 
A) 0.01 
B) 0.2 
C) 0.5 
D) 3.0 
E) 7.5

Question 16

Highly weathered soils low in available sulfur in their A horizons often have adequate supplies of available sulfur in deeper,clay-rich horizons.

Accepted Answer

A) True 
 B)False

Question 17

Ammonium fixation occurs to the greatest extent in the O and A horizons.

Accepted Answer

A) True 
 B)False

Question 18

The terms "ammonium fixation" and "biological nitrogen fixation" refer to the same soil process.

Accepted Answer

A) True 
 B)False

Question 19

Pesticides and other chemicals added to soils would be more likely to slow down nitrification than mineralization.

Accepted Answer

A) True 
 B)False

Question 20

In the early stages of plant nitrogen deficiency,the most obvious symptoms are _____.

Accepted Answer

A) yellowing of the youngest leaves 
B) brown spots and tiny holes on the underside of most leaves 
C) purpling of the youngest leaves 
D) yellowish colors in the oldest leaves 
E) brown edges on leaves scattered randomly all over the plant 
A) yellowing of the youngest leaves 
B) brown spots and tiny holes on the underside of most leaves 
C) purpling of the youngest leaves 
D) yellowish colors in the oldest leaves 
E) brown edges on leaves scattered randomly all over the plant

Forests in decline because of acid deposition can often be brought back to high productivity with just a few applications of nitrogen fertilizer.

Ammonia losses are likely to be greatest if a nitrogen source is placed about 10 cm deep in ____

Ammonia losses from the shallow,algae-filled water of a non-tidal wetland are likely to be much greater at night than during the day.

Nitrogen is a component of which essential plant compounds?

Nitric acid deposited on forest soils with "acid rain" can increase the leaching of nutrient cations.

Methemoglobinemia is principally a potential threat to _____.

In most temperate,humid regions,the period of greatest potential for nitrate leaching is during the summer when nitrogen fertilizer is applied to crops.

Plants obtain nitrogen from the soil by taking up ______.

Although slow release fertilizers take longer to have an effect,they are more economical than regular nitrogen fertilizers and so are favored by foresters and farmers.

On the average,agricultural soils in the US are currently being depleted of their nitrogen supply.

Soluble organic N compounds are taken up by plants and are lost in leaching and runoff waters.

By converting nitrite to ammonium,the anaerobic process of anammox increases nitrogen losses through volatilization of ammonia gas.

Because of _______,soils developed in marine marshes can become extremely acid if drained for agriculture or used as topsoil.

Ammonium fixation would be expected to be greatest in soils containing a lot of______.

Grass clippings from a healthy lawn can be expected to contain approximately ___% N (on a dry weight basis).

Highly weathered soils low in available sulfur in their A horizons often have adequate supplies of available sulfur in deeper,clay-rich horizons.

Ammonium fixation occurs to the greatest extent in the O and A horizons.

The terms "ammonium fixation" and "biological nitrogen fixation" refer to the same soil process.

Pesticides and other chemicals added to soils would be more likely to slow down nitrification than mineralization.

In the early stages of plant nitrogen deficiency,the most obvious symptoms are _____.

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

Soil Phosphorus and Potassium

Calcium,magnesium and Trace Elements

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

Geographic Information About Soils

Prospects for Global Soil Quality As Affected by Human Activities

Filters

Exam 13: Nitrogen and Sulfur Economy of Soils

Forests in decline because of acid deposition can often be brought back to high productivity with just a few applications of nitrogen fertilizer.

Ammonia losses are likely to be greatest if a nitrogen source is placed about 10 cm deep in ____

Ammonia losses from the shallow,algae-filled water of a non-tidal wetland are likely to be much greater at night than during the day.

Nitrogen is a component of which essential plant compounds?

Nitric acid deposited on forest soils with "acid rain" can increase the leaching of nutrient cations.

Methemoglobinemia is principally a potential threat to _____.

In most temperate,humid regions,the period of greatest potential for nitrate leaching is during the summer when nitrogen fertilizer is applied to crops.

Plants obtain nitrogen from the soil by taking up ______.

Although slow release fertilizers take longer to have an effect,they are more economical than regular nitrogen fertilizers and so are favored by foresters and farmers.

On the average,agricultural soils in the US are currently being depleted of their nitrogen supply.

Soluble organic N compounds are taken up by plants and are lost in leaching and runoff waters.

By converting nitrite to ammonium,the anaerobic process of anammox increases nitrogen losses through volatilization of ammonia gas.

Because of _______,soils developed in marine marshes can become extremely acid if drained for agriculture or used as topsoil.

Ammonium fixation would be expected to be greatest in soils containing a lot of______.

Grass clippings from a healthy lawn can be expected to contain approximately ___% N (on a dry weight basis).

Highly weathered soils low in available sulfur in their A horizons often have adequate supplies of available sulfur in deeper,clay-rich horizons.

Ammonium fixation occurs to the greatest extent in the O and A horizons.

The terms "ammonium fixation" and "biological nitrogen fixation" refer to the same soil process.

Pesticides and other chemicals added to soils would be more likely to slow down nitrification than mineralization.

In the early stages of plant nitrogen deficiency,the most obvious symptoms are _____.

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

Soil Phosphorus and Potassium

Calcium,magnesium and Trace Elements

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

Geographic Information About Soils

Prospects for Global Soil Quality As Affected by Human Activities

Filters