Question 1

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

Question 2

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

Accepted Answer

A)  soil with pH 6.3 and subject to frequent flooding 
B)  well drained calcareous soil with pH 8.1 
C)  well drained humid region loamy sand with pH 5.0 
D)  muck soil (Saprist) with pH 5.5 
E)  poorly drained calcareous soil with pH 7.6 
A)  soil with pH 6.3 and subject to frequent flooding 
B)  well drained calcareous soil with pH 8.1 
C)  well drained humid region loamy sand with pH 5.0 
D)  muck soil (Saprist) with pH 5.5 
E)  poorly drained calcareous soil with pH 7.6

Question 3

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

Question 4

Which method of application generally would require the greatest amount of iron to alleviate an iron deficiency in an orange grove?

Accepted Answer

A)  application of iron chelate to the soil in localized pockets 
B)  application of iron chelate to soil evenly with thorough mixing 
C)  foliar spray of iron chelate 
D)  application of iron sulfate to soil in localized pockets 
E)  application of iron sulfate to soil evenly with thorough mixing 
A)  application of iron chelate to the soil in localized pockets 
B)  application of iron chelate to soil evenly with thorough mixing 
C)  foliar spray of iron chelate 
D)  application of iron sulfate to soil in localized pockets 
E)  application of iron sulfate to soil evenly with thorough mixing

Question 5

Ammonia volatilization is a process by which much needed nitrogen is added to the pool of plant-available nitrogen in soils.

Accepted Answer

A) True 
 B)False

Question 6

Compared to land that is not disturbed by tillage, conventionally plowed cropland usually loses much more ______.

Accepted Answer

A)  dissolved P 
B)  particulate P 
C)  total P 
D)  both B and C are correct 
E)  none of the above is correct 
A)  dissolved P 
B)  particulate P 
C)  total P 
D)  both B and C are correct 
E)  none of the above is correct

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

The availability of which of the following micronutrients is commonly affected by soil redox potential?

Accepted Answer

A)  manganese 
B)  zinc 
C)  cobalt 
D)  boron 
E)  all of the above 
A)  manganese 
B)  zinc 
C)  cobalt 
D)  boron 
E)  all of the above

Question 9

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

Accepted Answer

A)  K2O 
B)  H2KO2-  
C)  K+  
D)  HKO22- E. P- 
A)  K2O 
B)  H2KO2-  
C)  K+  
D)  HKO22- E. P-

Question 10

Other things being equal, a soil with 30% clay of the ____ type would be expected to have the greatest potassium -fixing capacity.

Accepted Answer

A)  allophanic 
B)  2:1 
C)  1:1 
D)  crystalline iron oxide 
A)  allophanic 
B)  2:1 
C)  1:1 
D)  crystalline iron oxide

Question 11

Which of the following micronutrients becomes more available for plant uptake as soil pH is increased from pH 6 to pH 8?

Accepted Answer

A)  manganese 
B)  iron 
C)  zinc 
D)  boron 
E)  none of the above 
A)  manganese 
B)  iron 
C)  zinc 
D)  boron 
E)  none of the above

Question 12

The nutrient most often limiting the growth of aquatic plants and algae in unpolluted fresh water lakes is ______.

Accepted Answer

A)  N 
B)  S 
C)  P 
D)  K 
E)  none of the above 
A)  N 
B)  S 
C)  P 
D)  K 
E)  none of the above

Question 13

Mycorrhizae improve the nutrition of many plants by ______.

Accepted Answer

A)  transporting phosphorus through the soil to the plant root 
B)  fixing atmospheric phosphorus into forms readily used by plants 
C)  masking P-fixation sites on the surface of certain soil minerals 
D)  readily dissolving iron and aluminum phosphate compounds 
E)  making the root cell membrane more permeable to phosphate ions 
A)  transporting phosphorus through the soil to the plant root 
B)  fixing atmospheric phosphorus into forms readily used by plants 
C)  masking P-fixation sites on the surface of certain soil minerals 
D)  readily dissolving iron and aluminum phosphate compounds 
E)  making the root cell membrane more permeable to phosphate ions

Question 14

Which micronutrient is particularly critical for legume plants because of its place in the nitrogenase enzyme that allows Rhizobia-infected legumes to utilize atmospheric nitrogen?

Accepted Answer

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

Question 15

Which of the following nutrient elements is usually present in the soil solution as an undissociated acid?

Accepted Answer

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

Question 16

In most soils, mineralization of soil organic matter is an important source of plant available ____.

Accepted Answer

A)  potassium 
B)  phosphorus 
C)  both A and B 
D)  none of the above 
A)  potassium 
B)  phosphorus 
C)  both A and B 
D)  none of the above

Question 17

The process of ______ releases soluble nitrogen as the result of the breakdown of nitrogen-rich organic compounds.

Accepted Answer

A)  nitrification 
B)  denitrification 
C)  symbiosis 
D)  volatilization 
E)  mineralization 
A)  nitrification 
B)  denitrification 
C)  symbiosis 
D)  volatilization 
E)  mineralization

Question 18

Molybdenum toxicity is most likely to occur under which soil conditions?

Accepted Answer

A)  soil with pH 4.3 and subject to frequent flooding 
B)  well drained calcareous soil with pH 8.0 
C)  excessively well drained humid region loamy sand with pH 5.0 
D)  muck soil (Saprist) with pH 5.5 
E)  poorly drained calcareous soil with pH 8.0 
A)  soil with pH 4.3 and subject to frequent flooding 
B)  well drained calcareous soil with pH 8.0 
C)  excessively well drained humid region loamy sand with pH 5.0 
D)  muck soil (Saprist) with pH 5.5 
E)  poorly drained calcareous soil with pH 8.0

Question 19

Plant symptoms such as interveinal chlorosis on new leaves suggest a deficiency of which micronutrient?

Accepted Answer

A)  Zn 
B)  Fe 
C)  Mn 
D)  all of the above 
E)  none of the above 
A)  Zn 
B)  Fe 
C)  Mn 
D)  all of the above 
E)  none of the above

Question 20

The natural microbial oxidation of nitrogen released by organic matter mineralization is a major source of soil acidity.

Accepted Answer

A) True 
 B)False

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

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

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

Which method of application generally would require the greatest amount of iron to alleviate an iron deficiency in an orange grove?

Ammonia volatilization is a process by which much needed nitrogen is added to the pool of plant-available nitrogen in soils.

Compared to land that is not disturbed by tillage, conventionally plowed cropland usually loses much more ______.

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

The availability of which of the following micronutrients is commonly affected by soil redox potential?

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

Other things being equal, a soil with 30% clay of the ____ type would be expected to have the greatest potassium -fixing capacity.

Which of the following micronutrients becomes more available for plant uptake as soil pH is increased from pH 6 to pH 8?

The nutrient most often limiting the growth of aquatic plants and algae in unpolluted fresh water lakes is ______.

Mycorrhizae improve the nutrition of many plants by ______.

Which micronutrient is particularly critical for legume plants because of its place in the nitrogenase enzyme that allows Rhizobia-infected legumes to utilize atmospheric nitrogen?

Which of the following nutrient elements is usually present in the soil solution as an undissociated acid?

In most soils, mineralization of soil organic matter is an important source of plant available ____.

The process of ______ releases soluble nitrogen as the result of the breakdown of nitrogen-rich organic compounds.

Molybdenum toxicity is most likely to occur under which soil conditions?

Plant symptoms such as interveinal chlorosis on new leaves suggest a deficiency of which micronutrient?

The natural microbial oxidation of nitrogen released by organic matter mineralization is a major source of soil acidity.

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

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Exam 12: Nutrient Cycles and Soil Fertility

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

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

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

Which method of application generally would require the greatest amount of iron to alleviate an iron deficiency in an orange grove?

Ammonia volatilization is a process by which much needed nitrogen is added to the pool of plant-available nitrogen in soils.

Compared to land that is not disturbed by tillage, conventionally plowed cropland usually loses much more ______.

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

The availability of which of the following micronutrients is commonly affected by soil redox potential?

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

Other things being equal, a soil with 30% clay of the ____ type would be expected to have the greatest potassium -fixing capacity.

Which of the following micronutrients becomes more available for plant uptake as soil pH is increased from pH 6 to pH 8?

The nutrient most often limiting the growth of aquatic plants and algae in unpolluted fresh water lakes is ______.

Mycorrhizae improve the nutrition of many plants by ______.

Which micronutrient is particularly critical for legume plants because of its place in the nitrogenase enzyme that allows Rhizobia-infected legumes to utilize atmospheric nitrogen?

Which of the following nutrient elements is usually present in the soil solution as an undissociated acid?

In most soils, mineralization of soil organic matter is an important source of plant available ____.

The process of ______ releases soluble nitrogen as the result of the breakdown of nitrogen-rich organic compounds.

Molybdenum toxicity is most likely to occur under which soil conditions?

Plant symptoms such as interveinal chlorosis on new leaves suggest a deficiency of which micronutrient?

The natural microbial oxidation of nitrogen released by organic matter mineralization is a major source of soil acidity.

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