Nutrients

P Phosphorus
Mg Magnesium
Ca Calcium
S Sulfur
B Boron
Cu Copper
Fe Iron
Zn Zinc

Onions - Growth retardation

Symptoms
Sulfur deficient plants produce fewer leaves. Young leaves turn uniformly yellow

Reasons
Sulfur Deficiency

Sulphur deficiency made worse by

  • Acidic soils
  • Light, sandy soils (leaching)
  • Low organic matter
  • Poorly aerated soils (waterlogged soils
  • ) Areas with low industrial emissions

Sulfur is important for

  • Component of enzymes and other proteins
  • Necessary for chlorophyll formation
  • Bulb weight and yield
  • Boosts pungency and sugar content
  • Tolerance to pest and disease attack
  • Increases skin strength and colour