what are macro nutrients? why are tehy called so?

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Macro-nutrients are nutrients required in relatively large quantities for growth and development of plants. They are six in number. Since they are required in large quantities, they are known as macro-nutrient. The six macro-nutrients required by plants are nitrogen, phosphorus, potassium, calcium, magnesium, and sulphur.

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 Macro-nutrients are those nutrients which are required in large quantities for growth and development of plants. Since they are required in large quantities, they are known as macro-nutrient.   
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Macro nutrients are the nutrients needed in large quantities by plants.
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They are called macro nutrients because they are needed in large quantities
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