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Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?

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Mobility of an element is an important factor that determines whether the deficiency symptom appears in younger parts or in older parts. If the elements are relatively immobile they cause deficiency symptoms in younger parts Whereas if the elements are relatively mobile, they cause deficiency symptoms in older parts. For example, the deficiency of nitrogen, potassium and magnesium are visible first in senescent leaves and the deficiency of sulphur and calcium appear in young leaves.

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