Sulphur (S)
Role in plants
Sulphur is required for amino acids (cysteine, methionine), protein synthesis, oils, and enzyme systems.
Deficiency symptoms
- Uniform yellowing
- Appears first on young leaves
- Thin stems
- Reduced protein synthesis
Toxicity symptoms
- Leaf tip burn
- Reduced growth
- Acidification effects
Natural sources
- Atmospheric deposition
- Organic matter mineralisation
- Gypsum
Fertiliser sources
- Ammonium sulphate
- Potassium sulphate
- Magnesium sulphate
Plant uptake forms