Certified Crop Advisor- Soil and Water
Management Exam. 81 Questions With 100%
Correct Answers 2024.
Which of the following is negatively charged?
anion
Cations are held on the CEC by _____ charges on clay and organic matter .
Positive
Which of the following clays contributes most to CEC if the same amount of each clay is present ?
montmorillonite
Potassium fixation occurs when which of the following clays is present in soil ?
Illite
If a soil has an EC of 0.6 siemens meter and contains 20 percent sodium on the CEC , it is a
_________soil .
saline - sodic
What is the textural class of soil that is 10 percent clay and 35 percent sand ?
Silt Loam
Which of the following increases as a soil's clay content increases ?
Surface Area
Which of the soil textures listed below has the highest porosity and lowest bulk density ?
Clay
The maximum value for plant available water is_____________.
The difference field capacity and wilting point
Which of the following textural classes has the largest potential available water ?
silt loam
Which kind of soil structure would be typical for a good seed bed ?
Granular
Soil structure modifies the physical properties of soil_____________.
Texture
, Good structure in the subsoil improves ________________.
root elongation
Soil microorganisms cause_________ in soil structure when crop residues are added to soil .
Increases
The bulk density of 100 cm³ of dry soil that weighs 145 g is_______ g / cm³ .
1.45
Which of the following soil textures has the greatest % porosity ?
clay
Which of the following can decrease bulk density ?
incorporating compost
In a typical row crop production system , most of the soil organic matter originates from_________.
crop residues
The stable form of soil organic matter is called______________.
humus
When organic materials decompose , most of the C ends up as ________________.
CO₂
Which of the following is not an example of a contribution of soil organic matter to soil properties ?
increased molybdenum availability
Soil organic matter is a source of ___________for crops .
nitrogen potassium
In order to increase soil organic matter levels , _____________must be markedly reduced or
eliminated .
weed control
Which of the following is most important in carbon sequestration ?
Reducing tillage
Which of the following favors increased soil microbial activity ?
increase in soil water content from 20 to 40 percent of water holding capacity
Which of the following organic materials would be expected to mineralize the most nitrogen
dairy manure
Management Exam. 81 Questions With 100%
Correct Answers 2024.
Which of the following is negatively charged?
anion
Cations are held on the CEC by _____ charges on clay and organic matter .
Positive
Which of the following clays contributes most to CEC if the same amount of each clay is present ?
montmorillonite
Potassium fixation occurs when which of the following clays is present in soil ?
Illite
If a soil has an EC of 0.6 siemens meter and contains 20 percent sodium on the CEC , it is a
_________soil .
saline - sodic
What is the textural class of soil that is 10 percent clay and 35 percent sand ?
Silt Loam
Which of the following increases as a soil's clay content increases ?
Surface Area
Which of the soil textures listed below has the highest porosity and lowest bulk density ?
Clay
The maximum value for plant available water is_____________.
The difference field capacity and wilting point
Which of the following textural classes has the largest potential available water ?
silt loam
Which kind of soil structure would be typical for a good seed bed ?
Granular
Soil structure modifies the physical properties of soil_____________.
Texture
, Good structure in the subsoil improves ________________.
root elongation
Soil microorganisms cause_________ in soil structure when crop residues are added to soil .
Increases
The bulk density of 100 cm³ of dry soil that weighs 145 g is_______ g / cm³ .
1.45
Which of the following soil textures has the greatest % porosity ?
clay
Which of the following can decrease bulk density ?
incorporating compost
In a typical row crop production system , most of the soil organic matter originates from_________.
crop residues
The stable form of soil organic matter is called______________.
humus
When organic materials decompose , most of the C ends up as ________________.
CO₂
Which of the following is not an example of a contribution of soil organic matter to soil properties ?
increased molybdenum availability
Soil organic matter is a source of ___________for crops .
nitrogen potassium
In order to increase soil organic matter levels , _____________must be markedly reduced or
eliminated .
weed control
Which of the following is most important in carbon sequestration ?
Reducing tillage
Which of the following favors increased soil microbial activity ?
increase in soil water content from 20 to 40 percent of water holding capacity
Which of the following organic materials would be expected to mineralize the most nitrogen
dairy manure
