Question

Identify the correct set of elements whose deficiency first occurs in older leaves.

• A. N, S, Ca
• B. N, Ca, Mg
• C. Mg, S, Ca
• D. N, K, Mg

Answer 1

The correct option is D N, K, Mg

The order of appearance of symptoms related to mineral deficiency in plants depends upon the mobility of elements in plants.

The deficiency of an element appears first in older tissues in case of elements that are readily mobilised and transported to young growing tissues. Examples of such elements are nitrogen (N), potassium (K) and magnesium (Mg).
While, the deficiency of elements that are relatively immobile appears in young growing tissues. Examples of such elements are sulphur (S) & calcium (Ca).