Nutrients

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

Onions - Growth retardation

Symptoms
Older leaves turn completely yellow along their entire length due to lack of chlorophyll. With progressing deficiency, browning and dieback of leaf tips will follow. Plant growth is considerously inhibited.

Reasons
Magnesium Deficiency

Onions - Growth retardation

Symptoms
Older leaves turn completely yellow along their entire length due to lack of chlorophyll. With progressing deficiency, browning and dieback of leaf tips will follow. Plant growth is considerously inhibited.

Reasons
Magnesium Deficiency

Onions - Growth retardation

Symptoms
The outer leaves show striped interveinal chlorosis, followed by tip-burn and necrosis. Growth is inhibited.

Reasons
Manganese Deficiency Onions are very susceptible to Mn deficiency.

Magnesium deficiency made worse by

  • Sandy soils
  • Acidic soils
  • Potassium rich soils
  • Soils receiving high potash applications
  • Cold wet periods

Magnesium is important for

  • Chlorophyll production
  • Improves shelf life by reducing rot