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Which of the following is not a primary nutrient required for plant growth?
Calcium
Phosphorus
Potassium
Nitrogen
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Answer:
Calcium is the right ans
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Out of them, Nitrogen, Phosphorus and Potassium are called primary nutrients or macronutrients. Three more elements viz. Calcium, Magnesium and Sulphur are known as secondary nutrients because the deficiency of them is less likely to be a growth limiting factor.
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