Calcium deficiency causes poorly developed roots with weak tips. Leaves are distorted with hooked tips and curled margins. Magnesium, Mg, is vital to chlorophyll production and is important in most enzyme reactions. Magnesium deficiency causes different symptoms in different plants, but commonly includes leaf yellowing with brilliant tints. Leaves may suddenly drop off without withering.
Symptoms show first on older leaves.
Excess magnesium may cause calcium deficiency. Sulfur, S, is an ingredient in proteins and is necessary for chlorophyll formation. Sulfur deficiency causes slow growth with small round leaves that roll upward and are stiff and brittle. Leaves drop off and tip buds die. Iron deficiency causes leaf yellowing while leaf veins stay green.