Magnesium deficiency

Constraint – Magnesium 

Plant use

  • Magnesium is a macronutrient

  • Magnesium is an essential component of chlorophyll and is required for the transport of phosphorus

  •  Magnesium deficiencies are rare


  • Chlorosis of leaves, while the veins remain green

  • Abnormally thin leaves

  • Older leaves first affected, and most affected


Mild yield penalties may accompany a severe deficiency


soil test or a plant tissue test should be used to confirm magnesium deficiency. A dolomite fertiliser can then be applied in appropriate quantities. Limiting the application of nitrogenous or potassium fertilisers to required amounts, rather than over supplying, may also increase the availability of magnesium. 


Links and Resources

DAFWA - Magnesium deficiency

General information on magnesium, what to look for in the paddock and plant, what else it could be, where it occcurs, treatment, and monitoring.

DEPI VIC - What nutrients do plants require? Magnesium

6.3.6. Symptoms, fertiliser supplements, animal health implications, and preventative measures. Page last updated 2013.