What indicates calcium deficiency in tomato?

Necrosis can be seen around the base of calcium-deficient leaves. Tomato blossom-end rot is a classic indication of calcium insufficiency. Symptoms include soft, lifeless necrotic tissue. As a result of this, the leaf margins grow more slowly than the remainder of the leaf, causing the leaf to cup downward. Plants that are deficient in calcium have a much higher tendency to wilt than plants that are not stressed.