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CCA International Exam Nutrient Management Newest 2025/2026 Complete All 170 Questions And Correct Answers |Already Graded A+||Brand New Version!
How does P, S, Mo, Co presence affect symbiotic nitrogen fixation? - ANSWER-Phosphorus, Sulfur, Molybdenum, and cobalt are all required for the microbe to do its job.
Describe how fixation/saturation affects the fate of P in soil - ANSWER- Phosphorus is released much slower on saturated, wet soils (where there are low oxygen levels)
Describe how pH affects the fate of P in soil - ANSWER-Soils with pH values between 6 - 7.5 are ideal for P-availability. pH values below 5.5 and between 7.5 - 8.5 limits P-availability to plants due to fixation by aluminum, iron, or calcium, often associated with soil parent materials.
Describe how mineralization affects the fate of P in soil - ANSWER- Mineralization of organic matter, which is when organic P is converted to plant available forms, provides a significant portion of P for crops.
Describe how soil erosion affects the fate of P in soil - ANSWER-P does not readily leach out of the root zone; potential for P-loss is mainly 1 / 4
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associated with erosion and runoff. Soils and sites that are most prone to erosion and runoff, or are in close proximity to streams, lakes and other water bodies need to be closely managed to avoid P loss.
Describe how soluble P transport affects the fate of P in soil - ANSWER-Low solubility reduces availability of P fertilizer as it is fixed by soil P-compounds. Fixed P is not lost, it becomes slowly available to crops over several years depending on soil and P compound type.
How does method of previous nutrient application affect soil sampling?
- ANSWER-The method can change the nutrient profile of a field.
Banding fertilizer/manure spreading are known to increase variability within a field. Not all areas receive the same amount of fertilizer or manure, so nutrient availability differs throughout the field. More variability = more sub-samples should be taken. If location of fertilizer bands is known, samples should NOT be taken directly from the band.
How does nutrient stratification affect soil sampling? - ANSWER- Nutrient stratification = irregularities in nutrient location throughout the soil profile. It is influenced primarily by tillage. In no-till situations, nutrient stratification is usually greater than for conventionally tilled fields. Consistent sampling to the recommended depth is critical.
How does within-field soil and crop variability affect soil sampling? - ANSWER-Encompasses other uncontrollable differences within a field.Thus, there are a minimum recommended number of sub-samples to be 2 / 4
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taken (2-3, then combine), and recommendations on the areas those samples should be taken from.
How does soil sufficiency level affect nutrient recommendations? - ANSWER-The sufficiency range is the nutrient level at which the plant has enough nutrients to function and develop properly, but not so much that it is poisoned. This is reported as "medium" or "high" on soil tests.
How does soil building/drawdown affect nutrient recommendations? - ANSWER-a rapid increase or build up is achieved by applying sufficiently high rates of fertilizer to give high soil test values in one or two years. drawdown is a situation where fertilizer is not applied in sufficient quantities to meet crop removal, thus soil nutrient level declines.
How does maintenance/crop removal affect nutrient recommendations? - ANSWER-nutrient applications equal to crop removal are called maintenance fertilizer rates
How does crop species affect plan analysis results? - ANSWER-critical value, sufficiency range, and toxic level for a given nutrient vary with crop species.
How does growth stage affect plan analysis results? - ANSWER-critical value, sufficiency range, and toxic level for a given nutrient vary as a crop matures 3 / 4
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How does plant part sampled affect plan analysis results? - ANSWER- the plant analysis is specific to a particular plant part or parts (e.g. leaf, petiole, seedling). The relationship between plant analysis and plant repossess varies with plant part sampled and, so, the results are invalid if a plant is sampled improperly.
How is proximal sensing used to asses plant nutrient status? - ANSWER-ground based proximal sensors are used to measure specific plant properties at a specific location. a previously found relationship between nutrient status and the plant properties is then used to assess nutrient status spatially or temporally.
How is chlorophyll meters used to used to asses plant nutrient status? - ANSWER-Chrolophyll meters are used on content of leaves which can be related to N sufficiency in the plant
How is remote sensing used to asses plant nutrient status? - ANSWER- sensors carried by aircraft or satellites are used to measure specific plant spectral properties at a specific location. a previously found relationship between nutrient status and these plant properties is then used to assess nutrient status spatially or temporally.
How does base saturation/nutrient balance affect nutrient recommendations? - ANSWER-the base saturation/nutrient balance approach has been suggested for Ca, Mg, and K recommendations and
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