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CCA (CERTIFIED CROP ADVISOR) EXAM AND PRACTICE EXAM NEWEST 2026 TEST BANK | CERTIFIED CROP ADVISOR EXAM PREP WITH COMPLETE 650 REAL EXAM QUESTIONS AND CORRECT VERIFIED ANSWERS/ ALREADY GRADED A+ (BRAND NEW!!!) 1. A fertilizer with an analysis of 0-46-0 would be considered: A. Urea B. Triple superphosphate C. Muriate of potash D. Ammonium nitrate Correct Answer: B Rationale: A 0-46-0 analysis indicates 0% nitrogen, 46% phosphate (P2Os), and 0% potash. This is triple superphosphate (TSP), a concentrated phosphorus fertilizer. Urea is 46-0-0, muriate of potash is 0-0-60, and ammonium nitrate is 34-0-0. 2. A soil has poor phosphorus availability. How will this affect the observed response to added nitrogen fertilizers? A. Nitrogen response will be enhanced by the low P B. Nitrogen response will be limited by the inadequate P supplies 1 C. There will be no effect on nitrogen response D. Nitrogen will become toxic to plants Correct Answer: B Rationale: Liebig's law of the minimum states that crop growth is limited by the scarcest nutrient. If phosphorus is deficient, plants cannot utilize added nitrogen effectively because they lack the energy (ATP) and root development needed to take up and assimilate nitrogen. 3. Alfalfa plants with white flecks near the edges of their leaflets are most likely deficient in which nutrient? A. Nitrogen B. Phosphorus C. Potassium D. Sulfur Correct Answer: C Rationale: Potassium deficiency in alfalfa appears as white or yellow spots along leaflet margins, a condition called "White fleck." As deficiency progresses, margins scorch and leaves curl. Potassium is critical for protein synthesis, water regulation, and enzyme activation in alfalfa. O. They are often called "fertilizer elements" because they are most commonly applied to correct deficiencies. 6. Denitrification would be highest under which set of conditions? A. Well-aerated, dry, sandy soil B. No-till management, wet season, poorly drained soil C. Conventional tillage, dry season, clay soil D. High pH, high temperature, dry conditions Correct Answer: B Rationale: Denitrification is an anaerobic process where bacteria convert nitrate (NO3 ) to nitrogen gas (Nz). It requires waterlogged, oxygen-depleted conditions, which are common in no-till soils with poor drainage during wet seasons. 7. For no-till corn, why is a slightly higher rate of nitrogen fertilizer recommended compared to conventional tillage? A. No-till soils have lower organic matter B. Nitrogen losses to immobilization and denitrification are higher in no-till systems C. Corn roots cannot reach deep nitrogen in no-till D. No-till increases nitrogen volatilization from urea Correct Answer: B Rationale: No-till soils often have higher surface residue, cooler soils, and greater moisture, all of which slow nitrogen mineralization from organic matter. Immobilization (microbial uptake) and denitrification (in anaerobic microsites) increase, requiring higher N rates. 8. In scientific language, cation exchange capacity (CEC) is expressed in milliequivalents per 100 grams of soil. If a farmer's soil test reports 142 ppm of potassium, how many pounds per acre of potassium does her soil have? A. 71 pounds/acre B. 142 pounds/acre C. 284 pounds/acre D. 426 pounds/acre Correct Answer: C Rationale: To convert ppm to lb/acre for a 6-inch soil depth (assuming 2 million pounds of soil per acre), multiply ppm by 2. So 142 ppm X 2 = 284 lb/acre of potassium. 9. A soil test indicates low available phosphorus. Which fertilizer source would be most appropriate? A. Ammonium nitrate A. At emergence B. When plants are 6 inches tall C. One-half of plants beginning to silk D. At maturity Correct Answer: C Rationale: For corn, the optimal time for whole-plant sampling is at early silking (R1 stage), when about half the plants have begun to silk. This growth stage represents peak nutrient accumulation and allows diagnosis before yield is significantly affected. 12. Keeping soil pH close to 7.0 so that molybdenum is reasonably available is most important for which plant? A. Corn B. Soybeans C. Alfalfa D. Wheat Correct Answer: C Rationale: Alfalfa requires molybdenum for nitrogen fixation by rhizobia bacteria in root nodules. Molybdenum availability decreases sharply below pH 6.5. Maintaining pH near 7.0 ensures adequate Mo for optimal nitrogen fixation and yield. 7 13. Nitrogen use efficiency by cereal crops is: A. Reduced if N application rates are excessive B. Reduced if soils are consistently waterlogged C. Reduced if other nutrients are in short supply D. All of the above Correct Answer: D Rationale: Nitrogen use efficiency is reduced under multiple conditions: (1) excessive N leads to luxury consumption and leaching; (2) waterlogged soils cause denitrification and poor root function; (3) deficiencies of P, K, or micronutrients limit the plant's ability to utilize N. 14. Of the three primary macronutrients, which is most mobile within crop plants? A. Phosphorus B. Potassium C. Nitrogen D. They are equally mobile Correct Answer: C Rationale: Nitrogen is the most mobile macronutrient within plants. When deficient, nitrogen is translocated from older leaves to photosynthesis, respiration, and energy transfer throughout the plant. 17. Which nutrient deficiency typically causes yellowing of older leaves first? A. Iron B. Nitrogen C. Calcium D. Boron Correct Answer: B Rationale: Nitrogen is mobile within the plant. When deficient, N is translocated from older leaves to younger, actively growing tissue. This results in chlorosis (yellowing) appearing first on older, lower leaves. 18. Which nutrient is most commonly deficient in sandy soils? A. Phosphorus B. Potassium C. Nitrogen D. Calcium Correct Answer: C Rationale: Nitrogen is highly mobile in soil and leaches easily from sandy soils due to their low water- and nutrient-holding 10 capacity. Sandy soils typically have low cation exchange capacity (CEC), allowing nitrate to move quickly through the profile. 19. Soil pH primarily affects crop production by influencing: A. Soil texture B. Nutrient availability C. Soil compaction D. Organic matter content Correct Answer: B Rationale: Soil pH controls the chemical form and solubility of many nutrients. It determines whether essential elements are available for plant uptake or bound in insoluble forms. Most nutrients are optimally available in the pH range of 6.0-7.0. 20. The main role of potassium in plants is: A. Cell wall formation B. Water regulation and enzyme activation C. Energy transfer D. Nitrogen fixation Correct Answer: B Rationale: Potassium regulates stomatal opening and closing (water regulation) and activates over 80 enzymes involved in 11 building blocks of proteins. Without adequate nitrogen, protein synthesis is severely limited, affecting all growth processes. 23. A soil with high clay content typically has: A. Low nutrient-holding capacity B. High cation exchange capacity C. Rapid drainage D. Low water retention Correct Answer: B Rationale: Clay particles have high surface area per unit mass and carry negative charges on their surfaces, giving them high cation exchange capacity (CEC). This allows clay soils to retain more nutrients and water than sandy soils. 24. Which crop can fix atmospheric nitrogen through symbiosis with rhizobia bacteria? A. Corn B. Wheat C. Soybean D. Canola Correct Answer: C Rationale: Soybeans are legumes that form symbiotic relationships with nitrogen-fixing rhizobia bacteria. The bacteria 13 convert atmospheric N2 into ammonia (NH3) within root nodules, providing nitrogen to the plant. 25. Nitrogen fixation converts atmospheric nitrogen into: A. Nitrate (NO3 ) B. Ammonia (NH3) C. Nitrite (NO2 >) D. Urea Correct Answer: B Rationale: Nitrogen-fixing bacteria use the enzyme nitrogenase to convert atmospheric N2 into ammonia (NH3). This ammonia is then incorporated into amino acids and other nitrogenous compounds. 26. Which fertilizer source contains the highest nitrogen concentration? A. Urea B. Ammonium nitrate C. Anhydrous ammonia D. Ammonium sulfate Correct Answer: C Rationale: Anhydrous ammonia (82-0-0) contains approximately 14 Correct Answer: B Rationale: Phosphorus is essential for root development and early establishment. Deficiency results in stunted, poorly branched root systems, which limits the plant's ability to access water and other nutrients. 29. Which organism converts ammonium to nitrate in soil? A. Fungi B. Nitrifying bacteria Cc. Algae D. Protozoa Correct Answer: B Rationale: Nitrification is a two-step bacterial process. Ammonia- oxidizing bacteria (e.g., Nitrosomonas) convert ammonium (NH4*) to nitrite (NO2 ), then nitrite-oxidizing bacteria (e.g., Nitrobacter) convert nitrite to nitrate (NO3 ). 30. Which practice helps manage herbicide resistance? A. Repeated use of one mode of action B. Rotating herbicide modes of action C. Higher application rates D. Late applications 16 Correct Answer: B Rationale: Rotating herbicide modes of action reduces selection pressure and slows the development of resistance. Using the same MOA repeatedly selects for resistant biotypes, as seen with glyphosate-resistant weeds. 31. What is the primary environmental concern with excess nitrogen fertilization? A. Soil acidification only B. Water contamination (nitrate leaching and runoff) C. Soil erosion D. Soil compaction Correct Answer: B Rationale: Excess nitrogen not taken up by crops can leach as nitrate into groundwater or run off into surface waters. Nitrate contamination of drinking water is a health hazard (methemoglobinemia/"blue baby syndrome"), and nitrogen runoff contributes to algal blooms and hypoxic "dead zones." 32. Which practice improves fertilizer placement efficiency? A. Broadcasting B. Banding 17 B. Potassium C. Boron D. Iron Correct Answer: C Rationale: Boron is critical for reproductive growth, including pollen tube formation, flower development, and seed set. Boron deficiency often results in poor pollination, fruit set, and seed development—sometimes without visible vegetative symptoms. 35. Which practice improves nitrogen use efficiency in corn? A. Fall application B. Split application C. Surface application on frozen soil D. Overapplication Correct Answer: B Rationale: Split nitrogen applications (e.g., pre-plant plus side- dress) better match crop demand, reducing the window for losses through leaching or denitrification. This improves nitrogen use efficiency and reduces environmental impact. 36. Which fertilizer contains both nitrogen and sulfur? A. Urea B. Ammonium sulfate 19 C. DAP (diammonium phosphate) D. MAP (monoammonium phosphate) Correct Answer: B Rationale: Ammonium sulfate (21-0-0-24S) supplies both nitrogen (21%) and sulfur (24%). Double-acting fertilizers are useful when both nutrients are deficient, especially for crops like canola and forages with high sulfur requirements. 37. Which factor limits phosphorus availability in acidic soils? A. Leaching B. Fixation by iron and aluminum C. Volatilization D. Denitrification Correct Answer: B Rationale: In acidic soils (pH < 5.5), phosphorus forms insoluble compounds with iron (Fe-P) and aluminum (AI-P). These strong bonds lock up P in forms unavailable to plants, requiring higher application rates to overcome fixation. 38. What is the main function of calcium in plants? A. Energy transfer B. Cell wall structure and signaling 20 
