Onions
  • Barley
  • Cabbage
  • Coffee
  • Lettuce
  • Maize
  • Onions
  • Potatoes
  • Tobacco
  • Tomato
  • Wheat

Nutrients

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

Onions - Deformation

Symptoms
Leaf tips turn white and twist corkscrew-like or bend at right angles.They may become chlorotic and die back.

Reasons
Copper Deficiency Adequate supplies of copper are important for bulb skin and onion scale development.

Copper deficiency made worse by

  • Organic soils
  • Chalky soils
  • Sandy soils
  • Reclaimed heathland
  • High nitrogen applications

Copper is important for

  • Component of enzymes
  • Important role in photosythesis and phenol metabolism of plants
  • Regulation of destructive superoxide radicals inside cells
  • Bulb quality
  • Skin finish and colour