Sulphur is a building block of proteins and enzymes, and is essential for chlorophyll formation. It's often overlooked but increasingly important as modern fertilisers contain less sulphur than older formulations.
Validated against standard laboratory soil test values by Kerala Agricultural University, College of Agriculture, Vellayani.
Unlike nitrogen, sulphur deficiency shows first in new growth — young leaves turn pale yellow uniformly, not just between veins.
Plants remain small with thin stems, often mistaken for nitrogen deficiency but appearing on newer leaves first.
Crops like legumes and oilseeds show measurable drops in protein and oil quality under sulphur stress.
Sulphur-deficient crops mature later, extending the growing season unexpectedly.
Illustrative comparison — actual symptom severity varies by crop species, growth stage, and the presence of compounding deficiencies.