Nutrients

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

Onions - Discolouration

Symptoms
Leaf tips - or short lengths of the leaf - die back, without any previous yellowing of the leaf, causing the top of the leaf to fall over and die.<

Reasons
Calcium Deficiency Calcium is a very important nutrient for growth and storage quality of onions.

Onions - Die off

Symptoms
Leaf tips - or short lengths of the leaf - die back, without any previous yellowing of the leaf, causing the top of the leaf to fall over and die.

Reasons
Calcium Deficiency Calcium is a very important nutrient for growth and storage quality of onions.

Calcium deficiency made worse by

  • Acidic soils
  • Sandy or light soils (leaching)
  • Acid peat soils
  • Soils rich in sodium
  • Soils rich in aluminium
  • Drought conditions
  • Fruit high in nitrogen or potassium
  • Large fruit

Calcium is important for

  • Root establishment and elongation as well as early crop growth
  • Increases plant height and vigor
  • Ca helps protect the bulbs against diseases and abiotic stress like chilling or salinity