Magnesium deficiency - Lettuce

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.

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

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.

Reasons
Magnesium deficiency on leaves and roots

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

Reasons
Magnesium deficiency on roots

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 it is severely inhibited.

Reasons
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.

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.

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