Symptoms
General plant development is delayed and growth is stunted. White cabbage develops succulent, brittle leaf tissue. Headforming is inhibited and crops are more susceptible to fungal infections.
Reasons
Sulfur deficiency (severe deficiency left, healthy right)
S deficiency can easily be confused with lack of N. Symptoms like delayed and stunted growth are similar, but chlorosis occurs on younger leaves first with S undersupply, whereas N deficiency symptoms are first visible on older foliage.