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Which of the following represents the 4Rs of nutrient stewardship?

A
B
C
D
to track
2026 Statistics

Key Facts: CCA Exam

150

Exam Questions

ASA

70%

Passing Score

Per Section

$280

Exam Fee

ASA 2026

$78,770

Median Ag Scientist Salary

BLS 2024

6%

Job Growth 2024-2034

BLS

13,000+

Active CCAs

ASA

The International CCA exam has 150 multiple-choice questions across 4 competency areas (Nutrient Management 28%, Soil and Water 24%, IPM 22%, Crop Management 26%) with a 70% passing score and 2.5 hour time limit. Over 13,000 CCAs are certified across North America. BLS reports agricultural and food scientists earned a median $78,770 in 2024 with 6% projected growth through 2034, and CCAs command a premium in the agricultural services sector.

Sample CCA Practice Questions

Try these sample questions to test your CCA exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following represents the 4Rs of nutrient stewardship?
A.Right source, right rate, right time, right place
B.Right rotation, right residue, right rainfall, right return
C.Right root, right row, right rainfall, right rate
D.Right rate, right ratio, right region, right rainfall
Explanation: The 4R Nutrient Stewardship framework, developed by the fertilizer industry and widely adopted by CCAs, stands for Right Source, Right Rate, Right Time, and Right Place. It is the foundation for site-specific nutrient recommendations that balance productivity, profitability, and environmental protection.
2Which form of nitrogen is most susceptible to leaching losses in well-drained soils?
A.Ammonium (NH4+)
B.Nitrate (NO3-)
C.Urea
D.Organic N
Explanation: Nitrate (NO3-) carries a negative charge and is not retained by the predominantly negatively-charged soil cation exchange sites. It moves freely with soil water and is the primary form of N lost via leaching, especially below the root zone in coarse-textured, well-drained soils.
3A soil test reports 30 ppm P (Bray P1). Approximately how many pounds of P per acre does this represent in the top 6 inches (assuming a bulk density of 1.3 g/cm3)?
A.30 lb P/acre
B.60 lb P/acre
C.78 lb P/acre
D.150 lb P/acre
Explanation: The conversion: 1 ppm = 2 lb/acre in a 6-inch acre-furrow slice at bulk density ~1.33 g/cm3. With ppm-to-lb/acre factor of 2.6 when BD is 1.3 (6-inch depth), 30 ppm x 2.6 = 78 lb P/acre. The commonly used rule of thumb is 30 ppm x 2 = 60 lb/acre for standard conditions, but the more accurate factor at BD 1.3 is ~2.6.
4What is the primary purpose of a urease inhibitor such as NBPT?
A.Prevent nitrification of ammonium to nitrate
B.Slow the conversion of urea to ammonium and reduce ammonia volatilization
C.Increase phosphorus solubility
D.Inhibit denitrification in saturated soils
Explanation: NBPT (N-(n-butyl) thiophosphoric triamide) is a urease inhibitor that temporarily blocks the urease enzyme responsible for converting urea to ammonium. By slowing hydrolysis, it keeps urea intact longer and gives rainfall or incorporation time to move the fertilizer into the soil, reducing NH3 volatilization losses from surface-applied urea.
5Which soil test extraction method is most appropriate for acidic soils (pH < 7.0) to measure available phosphorus?
A.Olsen (sodium bicarbonate)
B.Bray P1 (dilute HCl + NH4F)
C.Morgan
D.Mehlich-3 only at pH > 7.5
Explanation: Bray P1 uses a dilute acid (0.025 M HCl) with ammonium fluoride and works well for acidic to neutral soils (pH below ~7.2). In calcareous soils, the acid is neutralized by free carbonates and underestimates available P. Olsen (NaHCO3) is the preferred method for calcareous soils.
6What is the approximate N content (by weight) of urea fertilizer (46-0-0)?
A.34%
B.46%
C.28%
D.21%
Explanation: Urea (CO(NH2)2) contains 46% nitrogen by weight and is the highest-analysis solid N fertilizer commonly used. The '46-0-0' grade explicitly states 46% N, 0% P2O5, 0% K2O.
7The law of the minimum, articulated by Justus von Liebig, states that:
A.Crop yield is determined by the nutrient present in the smallest relative amount
B.Nutrient uptake is proportional to concentration in solution
C.Adding more of a sufficient nutrient will still increase yield
D.All nutrients must be balanced in equal ratios
Explanation: Liebig's Law of the Minimum states that crop yield is limited by the most deficient essential nutrient, regardless of how much of the other nutrients are available. Increasing the supply of other nutrients will not raise yield until the limiting nutrient is addressed. This is the foundation of balanced fertilization programs.
8Which micronutrient deficiency is most commonly associated with high-pH (alkaline) soils?
A.Boron
B.Iron
C.Molybdenum
D.Chloride
Explanation: Iron (Fe) availability decreases sharply as soil pH rises above 7.0 because Fe precipitates as insoluble oxides and hydroxides. Iron chlorosis (interveinal yellowing on young leaves) is a classic symptom in soybeans, sorghum, and ornamentals grown on calcareous soils. Chelated Fe (Fe-EDDHA) is the most effective remediation.
9What is the primary reason for banding phosphorus fertilizer rather than broadcasting in cool, wet soils?
A.Banding reduces volatilization losses
B.Banded P is more concentrated, reducing soil fixation and improving early-season availability
C.Banding increases P leaching to tile drainage
D.Banding allows P to move deeper with irrigation
Explanation: Phosphorus reacts rapidly with Ca, Fe, and Al in the soil to form less-available compounds (fixation). Banding concentrates P in a localized zone, saturating the fixation sites and leaving more P available to young roots. This is especially important in cool, wet springs when root uptake and P mineralization are slow.
10Which tissue test result indicates potassium deficiency in corn at V6?
A.K below 1.5% in the youngest mature leaf
B.K below 2.0% in the ear leaf
C.K below 0.5% in any leaf
D.K above 3.0% in the whole plant
Explanation: At V6 corn, the sufficiency range for K in the youngest mature leaf is 2.0-3.0%. Values below about 1.5% indicate deficiency. At silking (R1), the ear leaf is sampled with a sufficiency range of 1.7-2.5%. Timing and tissue matter; values must be compared to the correct reference range.

About the CCA Exam

The International Certified Crop Adviser (CCA) exam is the flagship agronomy credential administered by the American Society of Agronomy. Candidates must also pass a Local Board exam. With 100+ free practice questions and an AI tutor, you can prepare with confidence.

Questions

150 scored questions

Time Limit

2 hours 30 minutes

Passing Score

70%

Exam Fee

$280 (American Society of Agronomy (ASA))

CCA Exam Content Outline

28%

Nutrient Management

Soil fertility principles, NPK cycling, secondary/micronutrients, soil and tissue testing, fertilizer materials, 4R stewardship

24%

Soil and Water Management

Soil physical and chemical properties, water movement, erosion control (RUSLE), irrigation, drainage, salinity and sodicity

22%

Integrated Pest Management

Weed/insect/disease identification, economic thresholds, cultural/biological/chemical control, HRAC/IRAC/FRAC modes of action

26%

Crop Management

Crop growth staging, tillage, rotations, cover crops, variety selection, planting/harvest, precision agriculture

How to Pass the CCA Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 150 questions
  • Time limit: 2 hours 30 minutes
  • Exam fee: $280

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

CCA Study Tips from Top Performers

1Master the 4R framework (Right source, Right rate, Right time, Right place) and nutrient cycling — Nutrient Management is 28% of the exam
2Memorize HRAC (herbicide), IRAC (insecticide), and FRAC (fungicide) mode-of-action groups for resistance management questions in IPM
3Learn corn V/R stages, soybean V/R stages, and wheat Feekes/Zadoks scales cold — crop staging questions appear in Crop Management
4Practice CEC, base saturation, and soil test interpretation calculations until they are second nature
5Use our AI tutor on every wrong answer — understanding WHY matters more than memorizing the right option

Frequently Asked Questions

What is the CCA exam pass rate?

Historically, first-time pass rates on the International CCA exam range from 55% to 65%, depending on candidate background. Candidates with recent agronomy coursework and daily field experience tend to pass at higher rates. Because you must pass BOTH the International exam and a Local Board exam, thorough preparation across all four competency areas (Nutrient, Soil and Water, IPM, Crop Management) is essential.

How many questions are on the International CCA exam?

The International CCA exam contains 150 multiple-choice questions drawn from the published Performance Objectives. Questions are distributed roughly as: Nutrient Management 28%, Crop Management 26%, Soil and Water Management 24%, and Integrated Pest Management 22%. You have 2 hours and 30 minutes to complete the exam, which is administered online with a remote proctor.

What is the passing score for the CCA exam?

You must score 70% or higher on each section to pass the International CCA exam. Under the section testing format, you can take each of the four competency areas separately and only retake the section(s) you fail. You have a five-year window to complete all four sections, and the exam is offered four times per year.

What are the prerequisites to become a CCA?

To be eligible for CCA certification, you need one of: (1) a Bachelor's degree in an agronomy-related field plus 2 years of documented crop advising experience, (2) an Associate degree plus 3 years of experience, or (3) no degree plus 4 years of post-high-school crop advising experience. You must also provide grower references, sign the CCA Code of Ethics, and pass BOTH the International and a Local Board exam.

How long should I study for the CCA exam?

Plan for 80-120 hours of focused study over 8-16 weeks. Candidates with weak areas in a specific domain (commonly soil chemistry, herbicide mode-of-action groups, or the 4R framework) should spend extra time there. Use our 100+ free practice questions covering all four competency areas, and aim to score 80%+ on practice tests before scheduling your exam.

What is the career outlook for CCAs?

BLS reports the median annual wage for agricultural and food scientists was $78,770 in May 2024, with the top 10% earning more than $140,080. Employment is projected to grow 6% from 2024-2034, faster than the average. CCAs work as independent consultants, retail agronomists, precision-ag specialists, and technical representatives for input manufacturers. Many earn commission or bonus on top of base salary.

Can I take the CCA exam one section at a time?

Yes. The International CCA offers section testing: you can take each of the four competency areas (Nutrient Management, Soil and Water Management, Pest Management, Crop Management) separately rather than all 150 questions at once. You have five years from your first section to pass all four. Section testing is priced per section (approximately one-quarter of the full exam fee).

How do I maintain CCA certification?

CCAs must earn 40 Continuing Education Units (CEUs) every two years, distributed across the four competency areas (minimum CEUs per area are required). CEUs are earned through approved conferences, webinars, college courses, and self-study. You must also re-sign the CCA Code of Ethics each renewal cycle and pay the annual renewal fee to remain in active status.