Multiple choice

Which of the following elements is not mainly supplied by fertilizers?

  1. N

  2. P

  3. Na

  4. K
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fertilizers primarily supply three macronutrients: Nitrogen (N), Phosphorus (P), and Potassium (K) - collectively known as NPK. Sodium (Na) is not a primary plant nutrient and is not a major component of commercial fertilizers. While plants need tiny amounts of sodium, it's not supplied through fertilization as it can be toxic at higher levels and is rarely deficient in soils.

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