1
CERTIFIED CROP ADVISOR WESTERN REGION EXAM
BANK 2025 ACTUAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALL ANSWERED {388 Q & A} ALREADY
GRADED A+ | GUARANTEED PASS
What are the 16 agriculturally important macro, secondary, and
micro nutrients? - ✔✔✔ Correct Answer > carbon, hydrogen, oxygen,
nitrogen, phosphorous, potassium, calcium, magnesium, sulfur,
iron, manganese, copper, boron, chlorine, zinc, molybdenum
What needs to be known to create an n budget - ✔✔✔ Correct Answer > 1.
Crop removal rate
2. Crop n uptake timing
3. Available n from organic matter
4. Available n from cover crops
5. Available n from previous crop
6. N from irrigation water applied
What is the general reccomendation for ppm value of no3- soil
test and tissue test - ✔✔✔ Correct Answer > 10-25 medium above 25 ppm
high.
,2
Satisfactory recommendations based on soil or tissue tests
depend on what three factors? - ✔✔✔ Correct Answer > 1. Collection of a
representative sample
2. Accurate analysis
3. Proper interpretation
Calculate the nitrogen applied from irrigation water for a 10 ppm
well at 1 acre inch of water - ✔✔✔ Correct Answer > 10ppmx1 acre/inx.227 =
2.27 lbs/acre
What is an acre/in of water in gallons - ✔✔✔ Correct Answer > 27,000
gallons
How do organic n forms differ from mineral - ✔✔✔ Correct Answer >
organic forms are not immediately available for use by crops.
Must be broken down by soil microorganisms. Blood/feather
meal and liquid fish are fastest to break down with most release
in first week and all in 3 weeks. Lower c:n ration faster break
down. Generally have a lower n amount
When to apply n for vegetable crops - ✔✔✔ Correct Answer > sidedress
after approximate a month with tomatoes. Plants have a
characteristic growth curve
,3
Calculate the amount of n from manure application - ✔✔✔ Correct Answer
> manure applied lb/acre x mizerilzation rate % x n content
%/10,000
When to soil sample for n - ✔✔✔ Correct Answer > n very dynamic. Test a
few weeks after planting for sidedress. Right after harvest see
how much n is leftover or do a pre-pant nitrate test
Role of potassium in plant growth - ✔✔✔ Correct Answer > photosynthesis,
water regulation (water stress without k), provides osmotic pull
and plant turgor increases, protein synthesis, transpiration
(regulate rate through stomatal opening), enzyme activation in
meristematic tissue
General potassium deficiency in plants - ✔✔✔ Correct Answer > slow
growth, tip and marginal chlorosis/necrosis starting on more
mature leaves, weak stems/stalks, small fruit, necrotic spotting
How does soil retain potassium - ✔✔✔ Correct Answer > 1.cec -
electrostatic attraction
2. K fixation
, 4
List the four forms of soil k - ✔✔✔ Correct Answer > 1. Mineral(structural)
- held in feldspars/micas and resistant to weathering
2. Nonchangeable (fixed) - held in clay 2:1 clay minerals such as
illite and vermiculite
3. Exchangeable - small clay facilitates release
4. Solution
How does clay mineralogy affect potassium fertilizer
requirements - ✔✔✔ Correct Answer > k fixation in 2:1 clays reduce k that
is avialbe to plants. Clays increase the cec which holds more k+
to negative charges. 1:1 clays such as kaolinte do not fix caly
minerals. Clay minerals high in k increase k in soul such as
vermicultie and montmorlinite.
How does soil temperature affect potassium fertilizer
requirements - ✔✔✔ Correct Answer > as temperature slows, uptake of k
slows. Root activity and k diffusion decrease with decreasing
temperature
How does soil moisture affect potassium fertilizer requirements -
✔✔✔ Correct Answer > increasing soil moisture, increase k diffusion
How does soil ph affect potassium fertilizer requirements - ✔✔✔
Correct Answer > very acidic = increase in al and mn bind to negative
sites reducing k
CERTIFIED CROP ADVISOR WESTERN REGION EXAM
BANK 2025 ACTUAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALL ANSWERED {388 Q & A} ALREADY
GRADED A+ | GUARANTEED PASS
What are the 16 agriculturally important macro, secondary, and
micro nutrients? - ✔✔✔ Correct Answer > carbon, hydrogen, oxygen,
nitrogen, phosphorous, potassium, calcium, magnesium, sulfur,
iron, manganese, copper, boron, chlorine, zinc, molybdenum
What needs to be known to create an n budget - ✔✔✔ Correct Answer > 1.
Crop removal rate
2. Crop n uptake timing
3. Available n from organic matter
4. Available n from cover crops
5. Available n from previous crop
6. N from irrigation water applied
What is the general reccomendation for ppm value of no3- soil
test and tissue test - ✔✔✔ Correct Answer > 10-25 medium above 25 ppm
high.
,2
Satisfactory recommendations based on soil or tissue tests
depend on what three factors? - ✔✔✔ Correct Answer > 1. Collection of a
representative sample
2. Accurate analysis
3. Proper interpretation
Calculate the nitrogen applied from irrigation water for a 10 ppm
well at 1 acre inch of water - ✔✔✔ Correct Answer > 10ppmx1 acre/inx.227 =
2.27 lbs/acre
What is an acre/in of water in gallons - ✔✔✔ Correct Answer > 27,000
gallons
How do organic n forms differ from mineral - ✔✔✔ Correct Answer >
organic forms are not immediately available for use by crops.
Must be broken down by soil microorganisms. Blood/feather
meal and liquid fish are fastest to break down with most release
in first week and all in 3 weeks. Lower c:n ration faster break
down. Generally have a lower n amount
When to apply n for vegetable crops - ✔✔✔ Correct Answer > sidedress
after approximate a month with tomatoes. Plants have a
characteristic growth curve
,3
Calculate the amount of n from manure application - ✔✔✔ Correct Answer
> manure applied lb/acre x mizerilzation rate % x n content
%/10,000
When to soil sample for n - ✔✔✔ Correct Answer > n very dynamic. Test a
few weeks after planting for sidedress. Right after harvest see
how much n is leftover or do a pre-pant nitrate test
Role of potassium in plant growth - ✔✔✔ Correct Answer > photosynthesis,
water regulation (water stress without k), provides osmotic pull
and plant turgor increases, protein synthesis, transpiration
(regulate rate through stomatal opening), enzyme activation in
meristematic tissue
General potassium deficiency in plants - ✔✔✔ Correct Answer > slow
growth, tip and marginal chlorosis/necrosis starting on more
mature leaves, weak stems/stalks, small fruit, necrotic spotting
How does soil retain potassium - ✔✔✔ Correct Answer > 1.cec -
electrostatic attraction
2. K fixation
, 4
List the four forms of soil k - ✔✔✔ Correct Answer > 1. Mineral(structural)
- held in feldspars/micas and resistant to weathering
2. Nonchangeable (fixed) - held in clay 2:1 clay minerals such as
illite and vermiculite
3. Exchangeable - small clay facilitates release
4. Solution
How does clay mineralogy affect potassium fertilizer
requirements - ✔✔✔ Correct Answer > k fixation in 2:1 clays reduce k that
is avialbe to plants. Clays increase the cec which holds more k+
to negative charges. 1:1 clays such as kaolinte do not fix caly
minerals. Clay minerals high in k increase k in soul such as
vermicultie and montmorlinite.
How does soil temperature affect potassium fertilizer
requirements - ✔✔✔ Correct Answer > as temperature slows, uptake of k
slows. Root activity and k diffusion decrease with decreasing
temperature
How does soil moisture affect potassium fertilizer requirements -
✔✔✔ Correct Answer > increasing soil moisture, increase k diffusion
How does soil ph affect potassium fertilizer requirements - ✔✔✔
Correct Answer > very acidic = increase in al and mn bind to negative
sites reducing k
