Nitrogen, Phosphorous, Potassium, Calcium, Magnesium and Sulphur are
known as
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they are elements.................
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Nitrogen, phosphorus and potassium are known as primary plant nutrients; calcium, magnesium and sulphur, as secondary nutrients; iron manganese, copper, zinc, boron, molybdenum and chlorine as trace elements or micro-nutrients. The primary and secondary nutrient elements are known as major elements.
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