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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

  1. A soil test report shows high magnesium levels relative to calcium. The MOST appropriate corrective action would be to apply:

    Answer: Calcitic limestone to supply calcium without additional magnesium

    Calcitic limestone supplies calcium to correct the Ca:Mg ratio imbalance without adding more magnesium as dolomitic limestone would.

  2. The cation exchange capacity (CEC) of a soil is important for nutrient management because it indicates:

    Answer: The soil's ability to hold cationic nutrients against leaching

    CEC measures the soil's ability to hold positively charged nutrient ions (K+, Ca2+, Mg2+, NH4+) and resist their leaching, informing application rate decisions.

  3. When preparing a field nutrient budget, manure nutrient credits must be included. For nitrogen in manure, applicators must account for:

    Answer: Both the immediately available inorganic N fraction and the slow-release organic N fraction

    Manure nitrogen exists as both quickly available inorganic N (NH4+) and slowly mineralizing organic N, and both fractions must be credited in the nutrient budget.

  4. Variable rate technology (VRT) in fertilizer application is most beneficial when:

    Answer: Significant within-field variability in soil test values exists

    VRT provides the greatest economic and environmental benefit when significant within-field soil variability exists, allowing site-specific nutrient applications.

  5. Sulfur deficiency symptoms in crops typically appear first as:

    Answer: Yellowing of young upper leaves since S is immobile in plants

    Sulfur is immobile within plants, so deficiency symptoms appear first in the youngest leaves (growing points) rather than in older tissue.

  6. A certified fertilizer applicator is reviewing a nutrient management plan for a field adjacent to a waterway. The plan should include what type of buffer consideration?

    Answer: Establish a no-application or reduced-rate buffer zone near the waterway

    Buffer zones with no or reduced fertilizer application near waterways are a best management practice to minimize nutrient runoff and water quality impacts.

  7. The term 'nitrogen use efficiency' (NUE) refers to:

    Answer: The ratio of crop N uptake to total N applied

    Nitrogen use efficiency is calculated as crop nitrogen uptake divided by total nitrogen applied, expressing how effectively the crop uses applied N.