Magnesium Deficiency in Tomato


Magnesium Deficiency in Tomato

Magnesium Deficiency


In a Nutshell

    Mottled chlorotic areas develop in the interveinal tissue of older leaves, often near the marginChlorosis progresses to the middle of the leaf and necrotic areas appearFinally, the yellowing engulfs the whole leaf, eventually leading to death and early sheddingThe growth of the plant is impaired, and fruit development and yield are compromised

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· Tomato


Magnesium deficiency in tomato plants generally start with mottled chlorotic areas developing in the interveinal tissue of older leaves, often near the margin. In case of severe deficiency, the chlorosis progresses to the middle of the leaf and the small veins also become affected. Later on, the development of necrotic areas in the highly chlorotic tissue gives the leaves a rugged and deformed aspect. Finally, the yellowing engulfs the whole leaf (main veins included), eventually leading to premature death and early shedding. The growth of the plant is impaired, and even though it is able to flower, fruit development and yield are compromised.


Magnesium deficiency is common in tomato, among other crops. It is particularly a problem in light, sandy or acidic soils with low nutrient and water retention capacity, and where magnesium can easily be leached away. Soils rich in potassium or ammonium or the excess application of these nutrients can also be problematic, because they hinder the uptake of magnesium by the plant. Magnesium is an important part of the chlorophyll molecules. Without sufficient amounts of magnesium, the plants begin to degrade the chlorophyll in the older leaves to transfer it to newly developing ones. This explains the development of interveinal chlorosis .

Biological Control

Use manure, organic mulches or compost to balance the nutrient content in the soil. These contain organic matter and many nutrients.

Chemical Control

Use soil or foliar fertilizers containing a magnesium complement. Magnesium oxide allows a slow release of the nutrient and is used in blends for an immediate supply of magnesium to crops. Magnesium sulphate releases the magnesium over a four to six week period to the soil and is ideal for a slow release requirement.

Preventive Measures

    Check the pH of the soil and lime if necessary to get the optimal rangePlan a good drainage of fields and do not over-water the cropDo not over fertilize with potashUse organic mulch to keep soil moisture stable


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