Nutrient Management & Application Planning Flashcards
7 cards from real CFA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Nutrient Management & Application Planning flashcards as text
A soil test indicates a phosphorus level of 45 ppm in a field intended for corn production. According to typical nutrient management guidelines, this level would be considered:
Answer: Sufficient, requiring maintenance rates only
A phosphorus level of 45 ppm is generally in the sufficient range for corn, warranting only maintenance applications rather than build-up rates.
When developing a nutrient management plan, the concept of 'realistic yield goal' is important because it:
Answer: Prevents over-application by setting achievable production targets
Realistic yield goals prevent over-application of nutrients by basing recommendations on achievable yields based on soil productivity and historical performance.
Which of the following best describes 'luxury consumption' in plant nutrition?
Answer: Plants absorbing more nutrients than needed for maximum growth
Luxury consumption occurs when plants absorb nutrients in excess of what is needed for maximum growth, which does not translate to additional yield.
A farmer reports that crop response to potassium fertilizer has been poor despite low soil K test levels. The MOST likely explanation is:
Answer: Soil pH is too low, limiting K availability
Low soil pH can limit potassium availability and uptake even when soil test K levels appear deficient, making pH correction a priority.
In split nitrogen applications, a portion of N is applied at planting and the rest during the growing season. The PRIMARY benefit of this approach is:
Answer: It reduces leaching and volatilization losses
Split nitrogen applications reduce losses from leaching and volatilization by providing N closer to when the crop needs it, improving nitrogen use efficiency.
When calculating fertilizer application rates, a grower needs to apply 120 lbs of actual nitrogen per acre using a 46-0-0 fertilizer. How many lbs of product per acre are needed?
Answer: 261 lbs/acre
Dividing the actual N needed (120 lbs) by the fertilizer N concentration (0.46) gives 261 lbs of 46-0-0 product per acre.
Organic matter in soil contributes to nutrient management primarily by:
Answer: Providing a slow-release reservoir of N, P, and S through mineralization
Soil organic matter releases nitrogen, phosphorus, and sulfur slowly through microbial mineralization, serving as a natural nutrient reservoir.