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
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