International CCA Cheat Sheet

Nutrient Management

Not published of exam
Plant Nutrition Soil Fertility Testing Sources 4R Stewardship Diagnostics Planning

Soil and Water Management

Not published of exam
Soil Properties Site Characterization Erosion Tillage Water Movement Irrigation Water Quality

Pest Management

Not published of exam
IPM Sampling Identification Thresholds Controls Stewardship Safety

Crop Management

Not published of exam
Cropping Systems Variety Selection Establishment Development Technology Harvest Economics

Quick Facts

Exam International CCA
Format 150 multiple-choice
Full-exam time 2.5 hours
Modules 4
Module weights Not published
Pass score Not published
Standard setting Modified Angoff
Results Pass or fail
Delivery Remote IBT; select in-person sites
Exam windows 4 each year
Section testing Route dependent
Section time 1 hour when offered
Completion window 5 years
Remote scratch paper One blank sheet
Remote calculator Built into exam
Remote breaks None without accommodation
Renewal 40 CEUs / 2 years
Core CEUs 5 per core area
Ethics CEU 1 per cycle starting 2026

The Four Rs NU

Source - Rate - Time - Place
Source: product Rate: amount Time: uptake Place: roots

Mineralization vs Immobilization NU

Mineralization

Organic to inorganic
Releases plant-available nutrients
Microbial process

Immobilization

Inorganic into biomass
Temporarily reduces availability
High-carbon residue risk
Release vs microbial tie-up

Field Diagnosis NU

Problem first appears → Map the pattern ( Edges, rows, patches )
Pattern follows equipment → Check application ( Rate and overlap )
Symptoms follow drainage → Check roots and oxygen ( Waterlogging possible )
Older leaves affected → Check mobile nutrients ( N, P, K, Mg )
Newest leaves affected → Check immobile nutrients ( Ca, B, Fe clues )
Living agent suspected → Collect intact samples ( Include transition zone )
Nutrient issue suspected → Pair soil and tissue ( Good versus poor )
Cause is confirmed → Choose corrective action ( Treat root cause )

Essential Plant Nutrients NU

From air and water Carbon, hydrogen, oxygen
Primary macronutrients Nitrogen, phosphorus, potassium
Secondary macronutrients Calcium, magnesium, sulfur
Micronutrients I B, Cl, Cu, Fe
Micronutrients II Mn, Mo, Ni, Zn
Essential total 17 elements
Nitrogen Proteins and chlorophyll
Phosphorus Energy transfer and roots
Potassium Osmoregulation and enzymes
Calcium Cell walls and membranes
Magnesium Chlorophyll center
Sulfur Sulfur amino acids

Soil vs Plant Mobility NU

Soil mobility

Movement toward roots
Controls leaching risk
Nitrate highly mobile

Plant mobility

Remobilization within plant
Controls symptom location
N symptoms start older
Transport in soil vs plant

Nutrient Plan Builder NU

Starting recommendation → Define realistic yield ( Crop and field )
Need nutrient status → Use calibrated tests ( Correct depth and method )
Manure or legumes used → Subtract nutrient credits ( Avoid double counting )
Need product amount → Divide by grade fraction ( N-P2O5-K2O basis )
Loss risk is high → Split or stabilize ( Match local guidance )
Roots need access → Choose effective placement ( Avoid seed injury )
Recommendation complete → Check all four Rs ( Source, rate, time, place )
Application finishes → Document and evaluate ( Improve next plan )

Nutrient Transformations NU

Mineralization Organic to inorganic
Immobilization Inorganic into biomass
Nitrification Ammonium to nitrate
Denitrification Nitrate to gases
Volatilization Ammonia gas loss
Leaching Solute below root zone
Biological fixation Atmospheric N to ammonia
Phosphorus fixation P becomes less soluble
Crop removal Nutrients leave at harvest
Residue return Nutrients cycle back

Soil Fertility Core NU

CEC Holds exchangeable cations
High CEC More nutrient buffering
Base cations Calcium, magnesium, potassium, sodium
Base saturation Base cations ÷ CEC
Soil pH Hydrogen activity index
Buffer pH Estimates lime requirement
Low-pH toxicity Aluminum and manganese risk
High-pH issue Many micronutrients become less available
Organic matter Nutrients, aggregation, water holding
Electrical conductivity Soluble salt indicator

Testing + Diagnostics NU

Representative sample Many consistent subsamples
Sampling depth Match calibration guidance
Avoid odd areas Sample separately
Grid sampling Systematic spatial pattern
Zone sampling Management-based areas
Plant analysis Confirms tissue nutrient status
Paired sampling Good versus affected plants
Mobile nutrient symptoms Older leaves first
Immobile nutrient symptoms New growth first
Visual diagnosis Hypothesis, not proof
Field history Narrows likely causes
Lab method Use locally calibrated interpretation

Deficiency Patterns NU

Nitrogen Older uniform chlorosis
Phosphorus Stunting, possible purpling
Potassium Older marginal chlorosis
Magnesium Older interveinal chlorosis
Sulfur Newer uniform chlorosis
Iron Newer interveinal chlorosis
Zinc Short internodes, chlorosis
Boron Growing-point injury
Calcium Meristem and fruit disorders
Symptom mimic Check roots and environment

4R + Fertilizer Math NU

Right source Fits crop and site
Right rate Matches need and credits
Right time Synchronizes with uptake
Right place Improves root access
Fertilizer grade Percent N-P2O5-K2O
Product needed Nutrient need ÷ decimal grade
P2O5 to P Multiply by 0.44
P to P2O5 Multiply by 2.29
K2O to K Multiply by 0.83
K to K2O Multiply by 1.20
Credits Manure, legumes, residual nutrients
Plan records Source, rate, time, place

RUSLE Factors SO

A = R x K x LS x C x P
R: rainfall K: soil LS: slope C: cover P: practice

Field Capacity vs Wilting SO

Field capacity

After gravitational drainage
Upper available-water boundary
More water retained

Wilting point

Plant cannot recover
Lower available-water boundary
Water held too tightly
Available water lies between

Water Management Picker SO

Water ponds after rain → Check infiltration and drainage ( Compaction or restriction )
Runoff carries sediment → Add cover and slow flow ( Contour and residue )
Nitrate leaching risk → Match timing and uptake ( Avoid excess water )
Crop nears stress → Irrigate before depletion ( Use rooting depth )
Application is uneven → Check distribution uniformity ( Nozzles and pressure )
Salts accumulate → Assess EC and drainage ( Leaching needs outlet )
Sodium disperses soil → Assess SAR and calcium ( Correct drainage first )
Practice is selected → Monitor crop and water ( Verify response )

Soil Physical Properties SO

Sand 2.0 to 0.05 mm
Silt 0.05 to 0.002 mm
Clay Below 0.002 mm
Texture Sand, silt, clay proportions
Structure Arrangement into aggregates
Bulk density Dry mass ÷ bulk volume
Compaction Higher density, fewer pores
Macropores Drainage and aeration
Micropores Water retention
Aggregate stability Resists slaking and erosion
Tilth Suitability for crop growth

Leaching vs Runoff SO

Leaching

Downward through profile
Threatens groundwater
Sandy soil risk

Runoff

Across soil surface
Threatens surface water
Slope and sealing risk
Below root zone vs downslope

Soil-Water Relations SO

Saturation Pores filled with water
Field capacity After free drainage
Permanent wilting point Plant cannot recover
Available water Field capacity minus wilting
Infiltration Water enters soil
Percolation Water moves downward
Capillary rise Water moves upward
Evapotranspiration Evaporation plus transpiration
Plant-available water Depends on texture and rooting
Waterlogging Restricts root oxygen
Restrictive layer Limits roots or drainage

Salinity vs Sodicity SO

Salinity

High soluble salts
Measured with EC
Osmotic water stress

Sodicity

High exchangeable sodium
Assessed with ESP or SAR
Dispersion and infiltration loss
Salt stress vs structure damage

Erosion + Tillage SO

Sheet erosion Uniform thin-layer loss
Rill erosion Small flow channels
Gully erosion Channels tillage cannot erase
Wind erosion Detachment and transport by wind
RUSLE A = R K LS C P
R Rainfall erosivity
K Soil erodibility
LS Slope length and steepness
C Cover-management factor
P Support-practice factor
Residue cover Reduces detachment and runoff
Contour farming Shortens downslope flow

Irrigation + Water Quality SO

Irrigation need Crop use minus effective rainfall
Application efficiency Stored water ÷ applied water
Uniformity Evenness across field
Overirrigation Leaching and runoff risk
Underirrigation Yield-limiting stress
Drainage Removes excess root-zone water
Salinity Total soluble salts
Sodicity Excess exchangeable sodium
SAR Sodium hazard index
High salinity Reduces water uptake
High sodicity Disperses soil structure
Nitrate risk Mobile groundwater contaminant

IPM PAMS PE

Prevent - Avoid - Monitor - Suppress
Prevent entry Avoid impact Monitor level Suppress loss

Threshold vs Injury Level PE

Economic threshold

Action point
Below injury level
Prevents economic loss

Economic injury level

Loss equals control cost
Damage benchmark
Threshold must precede it
Act before loss equals cost

IPM Decision PE

Injury is observed → Identify the cause ( Biotic or abiotic )
Pest is confirmed → Sample representative areas ( Record crop stage )
Population is below threshold → Monitor again ( Do not treat automatically )
Threshold is reached → Compare feasible tactics ( Economic and environmental )
Nonchemical control works → Prefer compatible tactic ( Preserve natural enemies )
Pesticide is justified → Read current label ( Site, rate, timing )
Resistance risk exists → Rotate effective groups ( Not just brand names )
Treatment is complete → Evaluate control ( Document outcome )

IPM Foundations PE

IPM Integrates compatible tactics
Prevention Keep pest from establishing
Avoidance Evade pest impact
Monitoring Measure pest and crop
Suppression Reduce unacceptable populations
Economic injury level Loss equals control cost
Economic threshold Act before injury level
Tolerance Some pest presence accepted
Natural enemies Predators, parasitoids, pathogens
Best decision Economical and environmentally sound

Disease Triangle PE

Host + Pathogen + Environment
Susceptible host Virulent pathogen Favorable environment

Biotic vs Abiotic Injury PE

Biotic

Living causal agent
May spread over time
Signs may be present

Abiotic

Nonliving causal factor
Often follows field pattern
No pathogen signs
Organism vs environment

Sampling + Identification PE

First diagnostic step Identify accurately
Representative pattern Cover field variability
Sampling unit Plant, row, area, trap
Sampling frequency Match pest development
Random sampling Each unit has equal chance
Systematic sampling Regular field intervals
Degree-days Predict development timing
Disease triangle Host, pathogen, environment
Abiotic injury Nonliving causal factor
Biotic injury Living causal agent
Field pattern Clue, not final diagnosis

Pest Control Tactics PE

Cultural Rotation, planting date, sanitation
Mechanical Cultivation, traps, barriers
Biological Natural enemies or biopesticides
Genetic Resistant crop traits
Regulatory Quarantine and exclusion
Chemical Pesticide when justified
Mode of action Biochemical target process
Resistance selection Repeated pressure favors survivors
Rotate groups Change modes, not brands
Tank mixture Each partner must be effective
Refuge Maintains susceptible individuals

Pesticide Stewardship PE

Label Legal use directions
Signal word Acute toxicity category
PPE Follow label minimums
REI Restricted-entry interval
PHI Application-to-harvest interval
Drift Off-target airborne movement
Runoff Surface transport with water
Volatility Vapor movement after application
Sensitive area Protect with label controls
Spill priority Protect, control, contain
Records Document product and application

Four Exam Modules CR

Nutrients - Soil/Water - Pests - Crops
No published weights Study every PO Pass via Modified Angoff

Fixed vs Variable Cost CR

Fixed cost

Exists without production
Depreciation and ownership
Allocated across output

Variable cost

Changes with production
Seed, fertilizer, fuel
Relevant to marginal choice
Ownership vs operating cost

Stand Decision CR

Emergence is uneven → Count multiple locations ( Map weak zones )
Plants are missing → Inspect seed and roots ( Find causal evidence )
Stand is below target → Estimate surviving yield ( Use local response data )
Replant is possible → Estimate delayed yield ( Later maturity risk )
Comparing choices → Add replant costs ( Seed, fuel, herbicide )
Existing stand competes → Include termination cost ( Check label restrictions )
Net return favors replant → Select adapted maturity ( Protect season length )
Decision is made → Record assumptions ( Review after harvest )

Cropping Systems CR

Rotation Sequences crops across seasons
Monoculture Same crop repeatedly
Intercropping Crops grown together
Double cropping Two harvests one season
Cover crop Protects and improves soil
Legume credit Reduces later nitrogen need
Reduced tillage Preserves residue cover
Crop diversity Breaks pest cycles
System tradeoff Yield, risk, soil, profit
Rotation restriction Check pesticide carryover

US/Canada Exam Pair CR

International

General agronomic knowledge
150 questions
Two and one-half hours

Local Board

Regional agronomy
100 questions
Two hours
US/Canada: general plus regional

Selection + Establishment CR

Maturity Fits frost-free season
Yield stability Performance across environments
Resistance traits Match local pest pressure
Seed quality Germination, vigor, purity
PLS percentage Purity × germination ÷ 100
Planting depth Moisture plus emergence balance
Seedbed Firm, moist, well-aerated
Plant population Live plants per area
Emergence percentage Plants emerged ÷ seeds planted
Stand assessment Count, uniformity, plant health
Replant decision Expected gain versus delay

Full Exam vs Section Testing CR

Full exam

All four modules together
One testing session
ICCA allows 2.5 hours

Section testing

Each module registered separately
One hour per section
Finish sections within five years
Starting sections commits to sections

Growth + Diagnostics CR

Photosynthesis Builds carbohydrate using light
Respiration Releases stored energy
Transpiration Water loss through stomata
Vegetative stage Leaves, stems, roots
Reproductive stage Flowers, seed, fruit
Critical period Stress most reduces yield
Growing degree-days Heat accumulation above base
GDD daily Mean temperature minus base
Source Exports assimilates
Sink Uses or stores assimilates
Root cause Confirm before treatment

Technology, Harvest + Economics CR

GPS Satellite position
GIS Spatial data analysis
Remote sensing Measures without contact
Yield monitor Maps harvest response
Variable-rate application Changes rate by location
Ground truthing Verifies sensed patterns
Harvest timing Balance yield, quality, losses
Safe storage Manage moisture and temperature
Aeration Controls grain temperature
Fixed cost Does not vary with output
Variable cost Changes with production
Break-even yield Total cost ÷ price
Break-even price Total cost ÷ yield
Partial budget Compares changed costs and returns

Exam + Credential Rules CR

International full exam 150 questions, 2.5 hours
Local Board full exam 100 questions, 2 hours
US and Canada route International plus Local Board
Mid-Atlantic route Additional nutrient exam applies
Outside US/Canada/Mexico Separate preapproval route
Full-exam route All modules in one sitting
Section route Register each module separately
Section-eligible exams US/Canada ICCA and Local Board
Section testing One hour per section
Section order Any order
Section commitment Finish that exam by sections
Section deadline Five years after first section pass
Section proctoring Separate sessions add proctor fees
Outside-US/Canada/Mexico sections Not offered
Completion clock Five years after first pass
Application timing Within six months after both passes
Bachelor's route Two years qualifying experience
Associate route Three years qualifying experience
No-degree route Four years qualifying experience
Experience incomplete CCA Candidate status available
CEU cycle 40 every two years
Each core area At least five CEUs
Board-approved CEUs At least 20 per cycle
Professional ethics Starting 2026, at least one
Outside-route CEUs At least 20 through online classroom
Annual renewal Pay required fee

Remote Test Day CR

Standard delivery Remote-proctored internet-based testing
In-person exception Select regions and dates
Computer Windows or Mac desktop/laptop
Not supported Tablet, Chromebook, smartphone
Displays One computer monitor only
Cameras Computer plus second camera
Identification Valid government photo ID
Name rule Must match registration exactly
Workspace Quiet, clean, materials removed
Allowed paper One blank sheet
Writing tool Pen or pencil
Calculator Provided within exam
Breaks Only with approved accommodation
Wearables No watches, headphones, hats
Browser Chrome, Firefox, or Edge
Before closing Show and destroy scratch paper

Common Traps

Invented domain weights

ASA publishes four modules ≠ It does not publish weights

Assuming a 70% pass

No universal percent published ≠ Modified Angoff sets standard

Exam equals certification

Exams are one requirement ≠ Experience and references remain

International exam only

US and Canada need local exam ≠ Mid-Atlantic may need another

Assuming sections are universal

Availability depends on route ≠ Outside-US/Canada/Mexico route excluded

Brand rotation

Brand change may keep mode ≠ Rotate effective MOA groups

Threshold equals injury

Threshold triggers action ≠ Injury level equals economic loss

Mobility confusion

Soil mobility predicts transport ≠ Plant mobility predicts symptoms

Grade reports elemental P

Fertilizer label uses P2O5 ≠ Potassium is reported as K2O

Symptoms prove deficiency

Many stresses mimic nutrients ≠ Confirm with evidence

More irrigation always helps

Excess drives runoff and leaching ≠ Schedule to root-zone need

Remote exam means open book

Workspace must be cleared ≠ Only allowed materials stay

Immediate result is final email

Screen shows pass or fail ≠ Official email follows later

Last Minute

1. 150 questions in 2.5 hours
2. Four modules; weights unpublished
3. Modified Angoff; no fixed percent
4. Remote: one blank scratch sheet
5. Use the built-in calculator
6. No routine remote-exam breaks
7. Match ID name exactly
8. Know all current Performance Objectives
9. Memorize the 17 essential nutrients
10. Separate soil and plant mobility
11. Use source-rate-time-place
12. Subtract nutrient credits
13. Grade means N-P2O5-K2O
14. Available water = FC minus PWP
15. RUSLE = R K LS C P
16. Threshold comes before injury level
17. Identify before treating
18. Rotate mode-of-action groups
19. Confirm field symptoms with evidence
20. Compare marginal costs and returns
21. International plus applicable local exam
22. Pass required exams within five years
23. Sections depend on candidate route
24. Renew with 40 CEUs per cycle
25. Earn five CEUs in each core
26. Include one professional-ethics CEU
27. Ensure 20 CEUs are Board-approved

ASA CCA Certified Crop Adviser

Practice Questions 125 questions Study Guide 56 topics Cheat Sheet 243 facts Flashcards 50 cards Free CE Podcast