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Nutrient Management Planning Flashcards

7 cards from real CCA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A nutrient management plan must account for manure application rates. A beef feedlot manure has 30 lbs total N per ton. If 50% of the N is ammonium (NH4-N) with a volatilization loss of 25%, what is the plant-available N from ammonium per ton of manure?

    Answer: 11.25 lbs/ton

    Ammonium-N = 15 lbs/ton × (1 − 0.25 loss) = 11.25 lbs/ton available from the ammonium fraction.

  2. The term 'luxury consumption' of potassium by crops refers to:

    Answer: Crop uptake of K above amounts needed for maximum yield when soil K is high

    Luxury consumption occurs when crops absorb K beyond their physiological requirements for maximum yield because soil K supply is abundant.

  3. A CCA is planning nitrogen applications for irrigated corn in a semi-arid region. Which of the following is the BEST strategy to minimize nitrate leaching while maintaining yield?

    Answer: Split nitrogen applications timed to match crop uptake using fertigation

    Fertigating N in split applications precisely timed to peak crop demand minimizes the N available for leaching during periods of low uptake.

  4. Which of the following represents the CORRECT order of cation adsorption strength on a negatively charged clay surface (weakest to strongest)?

    Answer: Na+ < K+ < Mg2+ < Ca2+ < Al3+

    Adsorption strength increases with charge and decreases with ionic radius; Al3+ > Ca2+ > Mg2+ > K+ > Na+ is the lyotropic series for common soil cations.

  5. A nutrient management plan for a corn-soybean rotation includes organic matter decomposition credits. If a field has 3.5% organic matter, what approximate annual nitrogen credit (lbs N/ac) from mineralization is used in most Midwest state guidelines?

    Answer: 20–35 lbs N/ac

    Most Midwest guidelines credit approximately 20 lbs N/ac per 1% organic matter annually, so 3.5% OM yields roughly 20–35 lbs N/ac from mineralization.

  6. Secondary macronutrient deficiency symptoms in crops often appear first on older leaves. Which of the following nutrients is MOST mobile in the phloem and therefore shows deficiency symptoms on older tissue?

    Answer: Magnesium

    Magnesium is highly mobile in the phloem and is reallocated from older to younger leaves under deficiency, causing interveinal chlorosis on lower leaves first.

  7. In a nutrient management plan, 'crop removal values' are used to estimate nutrient budgets. Which nutrient has the HIGHEST typical removal rate (lbs/bu) in corn grain?

    Answer: Nitrogen

    Nitrogen removal in corn grain is approximately 0.67 lbs N/bu, substantially higher than P2O5 (0.37 lbs/bu) or K2O (0.27 lbs/bu) removal rates.