Magnesium is a key element in chlorophyll and its deficiency affects mainly older leaves. A typical sign is interveinal chlorosis - yellowing between leaf veins. Another sign is leaves turning red-brown-purple, their necrosis, and drop off.
Yellowing between the leaf veins, sometimes with reddish brown tints and early leaf fall. Magnesium deficiency is common in tomatoes, apples, grape vines, raspberries, roses and rhododendrons.
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