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