CERTIFIED CROP ADVISOR (CCA) PRACTICE EXAM | 2026
NEWEST ACTUAL EXAM COMPLETE 650 QUESTIONS
WITH DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) /A+ STUDY MATERIAL
Which of the following factors is least important in soil erosion by water?
Length of slope
Crop residue cover
Soil fertility levels
Steepness of slope - CORRECT ANSWER ✔✔ - soil fertility levels
Soil clay particles:
Have a net negative charge
Have a net positive charge
have no electrical charge
Attract anions - CORRECT ANSWER ✔✔ - have a net negative charge
Plant nutrient ions having a positive charge are called: - CORRECT ANSWER ✔✔ -
cations
Soils with a relatively low cation exchange capacity (for example, 1 to 10
meq/100g) can generally be expected to have a:
Low water holding capacity
high clay content
1|Page
,High organic matter content
High lime requirement - CORRECT ANSWER ✔✔ - low water-holding capacity
Which of the following materials is NOT a limiting material?
Calcium carbonate
Magnesium carbonate
Calcium sulfate
Calcium oxide - CORRECT ANSWER ✔✔ - calcium sulfate
Soil pH:
Measures the H+ concentration absorbed to soil CEC sites
Tells if lime is needed to raise soil pH
Indicates how much lime is needed to raise soil pH
Is strongly influenced by soil texture - CORRECT ANSWER ✔✔ - tells if lime is
needed to raise soil pH
Each decrease of one soil pH unit results in soil acidity: - CORRECT ANSWER ✔✔ -
increasing by 10-fold
Buffer pH:
Measures the H+ concentration absorbed to soil CEC sites
Tells if lime is needed to raise soil pH
Indicates how much lime is needed to raise soil pH
Is strongly influenced by soil texture - CORRECT ANSWER ✔✔ - indicates how
much lime is needed to raise soil pH
2|Page
,Electrical conductivity of irrigation water provides an estimate of:
Na content of water
Ca content of water
NaCl content of water
pH of water - CORRECT ANSWER ✔✔ - salt content of the water
Which soil would have the poorest soil structure?
Calcareous
Saline
Sodic
Saline-sodic - CORRECT ANSWER ✔✔ - sodic soil
Which practices are needed to reclaim a saline soil?
Gypsum app and excess irrigation water
Calcium carbonate app and excess irrigation water
Excess irrigation water
Lower fert rates and manure app - CORRECT ANSWER ✔✔ - excess irrigation
water
_________ arises from a well defined origin, such as a discharge from an
industrial plant.
Non-point source pollution
Point source pollution
Max contamination level
3|Page
, Min contamination level - CORRECT ANSWER ✔✔ - point source pollution
A protectant fungicide implies that the fungicide _________.
Eliminates infection after the symptoms are seen
Becomes systemic in the plant
Is highly susceptible to photodecomposition
Protects the plant or seed before the disease occurs - CORRECT ANSWER ✔✔ -
protects the plant or seed before the disease occurs
A soil test measures ______ nutrients.
Total
Plant-available
Fertilizer-applied
Organic
All of the above - CORRECT ANSWER ✔✔ - plant-available
The recommended number of sub-sample cores needed to make a good soil
sample is: - CORRECT ANSWER ✔✔ - 12 to 15 cores
Soil sampling for pH in no-till and till plant systems should be done to a depth of
how many inches: - CORRECT ANSWER ✔✔ - 2" to 3"
Even though a soil sampling depth of 6-8 inches is typically recommended for
general soil sampling, which of the following requires a 0-24 inch depth under
certain conditions?
N
4|Page
NEWEST ACTUAL EXAM COMPLETE 650 QUESTIONS
WITH DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) /A+ STUDY MATERIAL
Which of the following factors is least important in soil erosion by water?
Length of slope
Crop residue cover
Soil fertility levels
Steepness of slope - CORRECT ANSWER ✔✔ - soil fertility levels
Soil clay particles:
Have a net negative charge
Have a net positive charge
have no electrical charge
Attract anions - CORRECT ANSWER ✔✔ - have a net negative charge
Plant nutrient ions having a positive charge are called: - CORRECT ANSWER ✔✔ -
cations
Soils with a relatively low cation exchange capacity (for example, 1 to 10
meq/100g) can generally be expected to have a:
Low water holding capacity
high clay content
1|Page
,High organic matter content
High lime requirement - CORRECT ANSWER ✔✔ - low water-holding capacity
Which of the following materials is NOT a limiting material?
Calcium carbonate
Magnesium carbonate
Calcium sulfate
Calcium oxide - CORRECT ANSWER ✔✔ - calcium sulfate
Soil pH:
Measures the H+ concentration absorbed to soil CEC sites
Tells if lime is needed to raise soil pH
Indicates how much lime is needed to raise soil pH
Is strongly influenced by soil texture - CORRECT ANSWER ✔✔ - tells if lime is
needed to raise soil pH
Each decrease of one soil pH unit results in soil acidity: - CORRECT ANSWER ✔✔ -
increasing by 10-fold
Buffer pH:
Measures the H+ concentration absorbed to soil CEC sites
Tells if lime is needed to raise soil pH
Indicates how much lime is needed to raise soil pH
Is strongly influenced by soil texture - CORRECT ANSWER ✔✔ - indicates how
much lime is needed to raise soil pH
2|Page
,Electrical conductivity of irrigation water provides an estimate of:
Na content of water
Ca content of water
NaCl content of water
pH of water - CORRECT ANSWER ✔✔ - salt content of the water
Which soil would have the poorest soil structure?
Calcareous
Saline
Sodic
Saline-sodic - CORRECT ANSWER ✔✔ - sodic soil
Which practices are needed to reclaim a saline soil?
Gypsum app and excess irrigation water
Calcium carbonate app and excess irrigation water
Excess irrigation water
Lower fert rates and manure app - CORRECT ANSWER ✔✔ - excess irrigation
water
_________ arises from a well defined origin, such as a discharge from an
industrial plant.
Non-point source pollution
Point source pollution
Max contamination level
3|Page
, Min contamination level - CORRECT ANSWER ✔✔ - point source pollution
A protectant fungicide implies that the fungicide _________.
Eliminates infection after the symptoms are seen
Becomes systemic in the plant
Is highly susceptible to photodecomposition
Protects the plant or seed before the disease occurs - CORRECT ANSWER ✔✔ -
protects the plant or seed before the disease occurs
A soil test measures ______ nutrients.
Total
Plant-available
Fertilizer-applied
Organic
All of the above - CORRECT ANSWER ✔✔ - plant-available
The recommended number of sub-sample cores needed to make a good soil
sample is: - CORRECT ANSWER ✔✔ - 12 to 15 cores
Soil sampling for pH in no-till and till plant systems should be done to a depth of
how many inches: - CORRECT ANSWER ✔✔ - 2" to 3"
Even though a soil sampling depth of 6-8 inches is typically recommended for
general soil sampling, which of the following requires a 0-24 inch depth under
certain conditions?
N
4|Page
