Magnesium deficiency-Lettuce

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Nutrients

Lettuce - Deformation

Symptoms
Interveinal chlorosis starts on the older leaves, which spreads inward from the leaf margins. The interveinal areas are curled upwards. In water culture, symptoms may also start on the younger leaves.

Causes
Magnesium deficiency on the leaf. Manganese deficiency symptoms are similar to those of Magnesium deficiency.

Lettuce - Deformation

Symptoms
Magnesium deficiency causes symptoms on older leaves first. They show yellow/orange discoloration on the leaf margins and interveinal yellowing. At prolonged deficiency yellow zones become necrotic, but veins still remain green. Furthermore the interveinal zones curl up. Growth is only slightly restricted when deficiency is moderate, but with severe deficiency growth is considerably inhibited.

Causes
Severe magnesium deficiency (right) compared to optimum supply (left) Manganese deficiency symptoms are similar to those of Mg deficiency.

Lettuce - Deformation

Symptoms
Magnesium deficiency causes symptoms on older leaves first. They show yellow/orange discoloration on the leaf margins and interveinal yellowing. Furthermore the interveinal zones curl up. At prolonged deficiency yellow zones become necrotic, but veins still remain green. Growth is only slightly restricted when deficiency is moderate, but with severe deficiency growth it is severely inhibited. With magnesium deficiency roots are long and only a few secondary roots are found.

Causes
Magnesium deficiency on leaves and roots

Lettuce - Discolouration

Symptoms
With magnesium deficiency roots are long, partly brownish in color and only few secondary roots are found.

Causes
Magnesium deficiency on roots

Lettuce - Deformation

Causes
Magnesium deficiency Also manganese deficiency shows yellowish zones between the veins, but the color is more greenish-yellow and not orange-yellow as with magnesium deficiency.

Lettuce - Deformation

Causes
Magnesium deficiency

Magnesium deficiency made worse by

Sandy soils
Acidic soils
Potassium rich soils
Soils receiving high potash applications
Cold wet periods

Magnesium is important for

Increased photosynthetic activity
Maintains good growth and healthy green leaves for high yields

Yara recommended fertilisers for Magnesium deficiency

YaraVita MAGFLO 300

Lettuce (field grown): 2-4 l/ha 2 weeks after transplanting. For moderate to severe deficiency repeat applications at 10 to 14 day intervals. Note: Final application to be made at least one month before harvest. Water rate: 500 l/ha.