Which element was added as an essential nutrient in the year 1987?
Essential nutrients are identified based on physiological necessity.
Nickel was recognized as an essential micronutrient in 1987.
It is required for urease enzyme activity in plants.
Nickel deficiency affects nitrogen metabolism.
Thus, Nickel fulfills the criteria of essentiality.
Therefore, option (d) is correct.
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Which element was added as an essential nutrient in the year 1987?
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