Role of Magnesium in Melon Production
Magnesium is required for many processes including transfer of energy, phosphate metabolism and protein synthesis.
With 20-25 % of the plant’s total magnesium localized in the chloroplasts, it is particularly important for chlorophyll production and early leaf and plant growth.
Magnesium and fruit quality
Magnesium uptake can be depressed by an excess of other cations (K+; NH4 +; Ca2+), so it is important to maintain a correct balance to avoid compromising uptake. An imbalance of cations will lower sugar content, and pulp and peel firmness (Cantaloupe, France).
Magnesium effect at growth stages
| Stage | Magnesium effect |
| Vegetative Growth | Maximize concentrations in leaf tissue prior to flowering |
| Flowering | Improve flowering and crop production |
| Fruit Set | Maximum requirements for quality fruit production are at this stage |
| Fruit Fill | Promote healthy fruit-fill |
See more on Melon Growth Stages.
General guidelines for Magnesium application
Up to 1,6 kg of magnesium per ton of fruit is used by a melon plant. A regular supply is needed throughout the life of the crop. Particular care is needed to ensure that magnesium, potassium and calcium supplies are balanced.
Magnesium deficiencies in melon
Leaves develop interveinal chlorosis, which may then become necrotic – a characteristic known as “Grillure”. This starts with the older leaves and spreads to the younger material. Leaf margins remain green. Fruit yields are reduced.
