Question 1

In acid soils the principal chemical form of phosphorus available for plant uptake is ____.

Accepted Answer

A)  P2O5  
B)  H2PO4-  
C)  P3+  
D)  HPO42-  
E)  P3- 
A)  P2O5  
B)  H2PO4-  
C)  P3+  
D)  HPO42-  
E)  P3-

Question 2

In order for nitrate to form from soil organic matter, _____ must be present in the soil.

Accepted Answer

A)  Nitrosomonas 
B)  Nitrobacter 
C)  either A or B 
D)  both A and B 
E)  none of the above 
A)  Nitrosomonas 
B)  Nitrobacter 
C)  either A or B 
D)  both A and B 
E)  none of the above

Question 3

Plants that are efficient at taking iron up from a calcareous soil are known to employ which of the following methods?

Accepted Answer

A)  lower pH of their rhizosphere 
B)  produce reducing agents that reduce Fe3+ to Fe2+ in the rhizosphere. 
C)  produce organic compounds that can form stable chelates with iron. 
D)  all of the above 
E)  none of the above 
A)  lower pH of their rhizosphere 
B)  produce reducing agents that reduce Fe3+ to Fe2+ in the rhizosphere. 
C)  produce organic compounds that can form stable chelates with iron. 
D)  all of the above 
E)  none of the above

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

The amount of P lost from agricultural soils by the process(s) of _____ is generally considerably greater than the corresponding losses of potassium.

Accepted Answer

A)  leaching 
B)  harvest removal 
C)  gaseous evolution 
D)  both b and c are correct 
E)  none of the above are correct 
A)  leaching 
B)  harvest removal 
C)  gaseous evolution 
D)  both b and c are correct 
E)  none of the above are correct

Question 6

In a soil at pH 5.0, most of the inorganic P is likely to be in the form of _______.

Accepted Answer

A)  monocalcium phosphates 
B)  tricalcium phosphates 
C)  hydroxy apatites 
D)  hydrous iron and aluminum phosphates 
E)  phospholipids 
A)  monocalcium phosphates 
B)  tricalcium phosphates 
C)  hydroxy apatites 
D)  hydrous iron and aluminum phosphates 
E)  phospholipids

Question 7

Nitrogen taken up by plants growing in a compost-treated soil is indistinguishable from the nitrogen taken up by plants growing in a fertilizer-treated soil.

Accepted Answer

A) True 
 B)False

Question 8

Because of their huge numbers and direct access to soil organic matter, free living microorganisms such as Azotobacter typically fix more nitrogen per hectare of land than do nitrogen-fixing bacteria living in plant roots.

Accepted Answer

A) True 
 B)False

Question 9

Approximately what percentage of the P in surface soils is typically found in organic forms?

Accepted Answer

A)  0.1 to 0.5% 
B)  1 to 5% 
C)  5 to 15% 
D)  25 to 75% 
E)  95 to 98% 
A)  0.1 to 0.5% 
B)  1 to 5% 
C)  5 to 15% 
D)  25 to 75% 
E)  95 to 98%

Question 10

When soil pH is between 4.5 and 5.5, which micronutrient most commonly causes plant toxicity?

Accepted Answer

A)  Zn 
B)  Cu 
C)  Fe 
D)  Mn 
E)  Mo 
A)  Zn 
B)  Cu 
C)  Fe 
D)  Mn 
E)  Mo

Question 11

Wetlands and forests growing along the banks of rivers remove much nitrogen from groundwater by the process of _________.

Accepted Answer

A)  immobilization 
B)  nitrification 
C)  denitrification 
D)  ammonification 
E)  none of the above 
A)  immobilization 
B)  nitrification 
C)  denitrification 
D)  ammonification 
E)  none of the above

Question 12

To be practical, a nitrification inhibitor should kill or inhibit _____.

Accepted Answer

A)  Nitrosomonas 
B)  Nitrobacter 
C)  either A or B 
D)  none of the above 
A)  Nitrosomonas 
B)  Nitrobacter 
C)  either A or B 
D)  none of the above

Question 13

The sites in certain clay minerals which fix potassium ions are also capable of fixing which other ion?

Accepted Answer

A)  NO3-  
B) NH4+  
C)  H2PO4-  
D)  Ca2+  
E)  H+ 
A)  NO3-  
B) NH4+  
C)  H2PO4-  
D)  Ca2+  
E)  H+

Question 14

Applying 10 kg/ha of which of the following nutrients would most likely cause toxicity to plants?

Accepted Answer

A)  manganese 
B)  iron 
C)  copper 
D)  boron 
E)  chlorine 
A)  manganese 
B)  iron 
C)  copper 
D)  boron 
E)  chlorine

Question 15

Manganese toxicity is most likely to be a problem under which soil conditions?

Accepted Answer

A)  clay loam Ultisol, pH 4.3, subject to frequent flooding 
B)  well drained calcareous soil, pH 8.1 
C)  well drained humid region loamy sand, pH 5.0 
D)  muck soil (Saprist) with pH 5.5 
E)  poorly drained calcareous soil with pH 7.6 
A)  clay loam Ultisol, pH 4.3, subject to frequent flooding 
B)  well drained calcareous soil, pH 8.1 
C)  well drained humid region loamy sand, pH 5.0 
D)  muck soil (Saprist) with pH 5.5 
E)  poorly drained calcareous soil with pH 7.6

Question 16

Non-point source losses of which element are considered to be a serious water pollution problem because the resulting high concentration of the element in stream water is toxic to most fish.

Accepted Answer

A)  potassium 
B)  phosphorus 
C)  both a and b 
D)  neither a nor b 
A)  potassium 
B)  phosphorus 
C)  both a and b 
D)  neither a nor b

Question 17

Iron deficiency is most likely to occur under which of the following soil conditions?

Accepted Answer

A)  soil with pH 4.3 and subject to frequent flooding 
B)  leached humid region sandy soil limed to pH 8.0 
C)  well drained humid region loamy sand (Spodosol) with pH 5.0 
D)  muck soil (Saprist) with pH 5.5 
E)  silt loam Mollisol with pH 7.5 
A)  soil with pH 4.3 and subject to frequent flooding 
B)  leached humid region sandy soil limed to pH 8.0 
C)  well drained humid region loamy sand (Spodosol) with pH 5.0 
D)  muck soil (Saprist) with pH 5.5 
E)  silt loam Mollisol with pH 7.5

Question 18

Copper deficiency is most likely to occur under which of the following soil conditions?

Accepted Answer

A)  soil with pH 4.3 and subject to frequent flooding 
B)  well drained loamy sand Ultisol with pH 6.1 
C)  silt loam soil with pH 7.0 
D)  muck soil (Saprist) with pH 5.5 
E)  poorly drained calcareous soil with pH 7.6 
A)  soil with pH 4.3 and subject to frequent flooding 
B)  well drained loamy sand Ultisol with pH 6.1 
C)  silt loam soil with pH 7.0 
D)  muck soil (Saprist) with pH 5.5 
E)  poorly drained calcareous soil with pH 7.6

Question 19

Applying heavy dressings of N fertilizer will tend to produce sugary-sweet fruits and vegetables.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following micronutrients is least commonly found to be deficient in plants?

Accepted Answer

A)  manganese 
B)  iron 
C)  copper 
D)  boron 
E)  chlorine 
A)  manganese 
B)  iron 
C)  copper 
D)  boron 
E)  chlorine

In acid soils the principal chemical form of phosphorus available for plant uptake is ____.

In order for nitrate to form from soil organic matter, _____ must be present in the soil.

Plants that are efficient at taking iron up from a calcareous soil are known to employ which of the following methods?

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

The amount of P lost from agricultural soils by the process(s) of _____ is generally considerably greater than the corresponding losses of potassium.

In a soil at pH 5.0, most of the inorganic P is likely to be in the form of _______.

Nitrogen taken up by plants growing in a compost-treated soil is indistinguishable from the nitrogen taken up by plants growing in a fertilizer-treated soil.

Because of their huge numbers and direct access to soil organic matter, free living microorganisms such as Azotobacter typically fix more nitrogen per hectare of land than do nitrogen-fixing bacteria living in plant roots.

Approximately what percentage of the P in surface soils is typically found in organic forms?

When soil pH is between 4.5 and 5.5, which micronutrient most commonly causes plant toxicity?

Wetlands and forests growing along the banks of rivers remove much nitrogen from groundwater by the process of _________.

To be practical, a nitrification inhibitor should kill or inhibit _____.

The sites in certain clay minerals which fix potassium ions are also capable of fixing which other ion?

Applying 10 kg/ha of which of the following nutrients would most likely cause toxicity to plants?

Manganese toxicity is most likely to be a problem under which soil conditions?

Non-point source losses of which element are considered to be a serious water pollution problem because the resulting high concentration of the element in stream water is toxic to most fish.

Iron deficiency is most likely to occur under which of the following soil conditions?

Copper deficiency is most likely to occur under which of the following soil conditions?

Applying heavy dressings of N fertilizer will tend to produce sugary-sweet fruits and vegetables.

Which of the following micronutrients is least commonly found to be deficient in plants?

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

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

Filters

Exam 12: Nutrient Cycles and Soil Fertility

In acid soils the principal chemical form of phosphorus available for plant uptake is ____.

In order for nitrate to form from soil organic matter, _____ must be present in the soil.

Plants that are efficient at taking iron up from a calcareous soil are known to employ which of the following methods?

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

The amount of P lost from agricultural soils by the process(s) of _____ is generally considerably greater than the corresponding losses of potassium.

In a soil at pH 5.0, most of the inorganic P is likely to be in the form of _______.

Nitrogen taken up by plants growing in a compost-treated soil is indistinguishable from the nitrogen taken up by plants growing in a fertilizer-treated soil.

Because of their huge numbers and direct access to soil organic matter, free living microorganisms such as Azotobacter typically fix more nitrogen per hectare of land than do nitrogen-fixing bacteria living in plant roots.

Approximately what percentage of the P in surface soils is typically found in organic forms?

When soil pH is between 4.5 and 5.5, which micronutrient most commonly causes plant toxicity?

Wetlands and forests growing along the banks of rivers remove much nitrogen from groundwater by the process of _________.

To be practical, a nitrification inhibitor should kill or inhibit _____.

The sites in certain clay minerals which fix potassium ions are also capable of fixing which other ion?

Applying 10 kg/ha of which of the following nutrients would most likely cause toxicity to plants?

Manganese toxicity is most likely to be a problem under which soil conditions?

Non-point source losses of which element are considered to be a serious water pollution problem because the resulting high concentration of the element in stream water is toxic to most fish.

Iron deficiency is most likely to occur under which of the following soil conditions?

Copper deficiency is most likely to occur under which of the following soil conditions?

Applying heavy dressings of N fertilizer will tend to produce sugary-sweet fruits and vegetables.

Which of the following micronutrients is least commonly found to be deficient in plants?

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

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

Filters