Magnesium deficiency

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A Mg-deficient crop showing interveinal chlorosis and bronze-red pigmentation on oldest leaves (J. Low).

Diagnostic summary

  • What you see on plants

- pale overall colour of crop.


- interveinal yellowing on older leaves, developing to light brown necrosis and drooping.


- older leaves may develop purple or reddish colour on upper surface, or on veins underneath.


- thin vines with lengthened internodes.

  • Most common in sandy soils, or when calcium or potassium levels are high.

Characteristics and occurrence


Confusion with other symptoms

Diagnostic tests



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