Leaf tips will turn jelly-like and die. Blossom-end rot of tomatoes is calcium deficiency. Margins of older leaves curl. Leaves may show yellowish, bronze, or reddish colors while the veins remain green. Leaves have a pale green color usually seen first on younger ones, however the whole plant may take on the pale green appearance.
Sulfur deficiencies most commonly occur on sandy soils or other low organic matter soils.
Younger leaves yellow between veins, but yellowing spreads to whole leaf and the leaves die from the edges. In severe cases dead spots form. The veins remain greenand get checkered effect on young leaves. Plants become brittle and growing tips may die. Deficiency symptoms should not be solely relied on for fertilizer recommendations due to two complicating factors.