Which of the following does not come under the category of 'secondary nutrient' for plant growth ?
Correct answer: A. Oxygen
- A. Oxygen
- B. Magnesium
- C. Sulphur
- D. Calcium
Explanation
Calcium, magnesium, and sulphur are the three secondary plant nutrients. Oxygen is a primary structural nutrient obtained mainly from air and water, so it is not classified as a secondary fertiliser nutrient.
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