Knowledgebase
Why are the lower leaves on my tomato plants turning yellow?
Posted by Suttons Staff on 24 June 2013 11:32 AM
The main symptom of magnesium deficiency in tomato plants is yellowing between the leaf veins and around the margins starting on the lower, older foliage and gradually moving up the plants.  Green bands remain immediately adjacent to the vein and as the green pigment deteriorates further purple or brown colouring develops between the veins.

To correct magnesium deficiency mix 200g of Magnesium Sulphate (Epsom Salts) in 10 litres of water (8oz in 2.5 gallons) applying as a foliar spray at 7-10 days intervals.

Alternatively mix 12g of Epsom Salts to 1 litre of water (2oz to 2 gallons) and water around the root area again at 7-10 day intervals.
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