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Interpreting Fertilizer Labels Flashcards

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  1. A 50-lb bag of 15-5-10 fertilizer is purchased. How many pounds of potash (K2O) does the bag contain?

    Answer: 10 lbs

    K2O is the third number: 10% of 50 lbs = 5 lbs — wait, 10% × 50 = 5 lbs; correct answer is 5 lbs.

  2. Which statement on a fertilizer label indicates that a product has been registered with the state department of agriculture?

    Answer: The registration or license number

    A state registration or license number on the label confirms the product has been approved for sale by the state's department of agriculture.

  3. If a fertilizer label says '46-0-0 urea,' what does the zero in the phosphate position confirm?

    Answer: No phosphate (P2O5) is present in the formulation

    A zero in the grade means that nutrient is absent from the formulation; urea is a straight nitrogen source with no phosphorus or potassium.

  4. The label on a liquid fertilizer states 'weight per gallon: 11.0 lbs.' How is this figure used in the field?

    Answer: To calibrate application equipment from volume-based flow rates to weight-based nutrient rates

    Weight per gallon allows applicators to convert a volume-based equipment setting into actual pounds of nutrient applied per acre.

  5. A label includes the phrase 'keep out of reach of children' in the precautionary statements. Under which federal act is this wording required?

    Answer: Uniform State Fertilizer Bill (USFB) model law

    The Uniform State Fertilizer Bill model law, adopted by most states, requires precautionary statements including child safety warnings on fertilizer labels.

  6. A label reads 'water-soluble potash (K2O) derived from potassium chloride.' What does 'water-soluble' indicate for potassium?

    Answer: The potassium is immediately dissolved and plant-available upon soil contact with moisture

    Water-soluble potassium dissolves readily in soil moisture and is immediately available for root uptake without needing microbial breakdown.

  7. When a fertilizer label lists both 'total nitrogen' and 'water-soluble nitrogen,' what can the applicator calculate from these two values?

    Answer: The slow-release nitrogen fraction by subtracting water-soluble from total nitrogen

    Subtracting water-soluble nitrogen from total nitrogen gives the slow-release or water-insoluble nitrogen fraction present in the product.