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. Younger leaves are affected first. Excess lime may cause iron deficiency. Manganese, Mn, is a catalyst for many enzymes and is important for chlorophyll formation. Manganese deficiency causes different symptoms in different plants, but commonly causes leaves to turn yellow while veins stay green.