Zinc deficiency vs. optimum-Lettuce

Symptoms
Symptoms of zinc deficiency on lettuce start on older or medium leaves. They develop papery, grey-green necrosic spots with brown borders on leaf margins. Necrotic areas increase quickly and flow together. Leaf parts which are not subjected to light remain green. Growth is restricted. Zinc deficiency in an early stage of development causes rosetting, no heads are formed.

Reasons
Zinc deficiency on leaves compared to optimum supply

Lettuce - Growth retardation

Symptoms
Symptoms of zinc deficiency on lettuce start on leaf margins of older or medium leaves. They develop papery, grey-green necrotic spots with brown borders, mostly without preceding chlorosis. Necrotic areas increase quickly and flow together. Leaf parts which are not subjected to light, remain green. Growth is restricted. Zinc deficiency in an early stage of development causes rosetting, no heads are formed.

Reasons
Zinc deficiency

Lettuce - Growth retardation

Reasons
Zinc deficiency

Lettuce - Growth retardation

Reasons
Zinc deficiency on leaves and roots

Lettuce - Chlorosis

Symptoms
Symptoms of zinc deficiency on lettuce start near leaf margins of older or medium leaves. They develop papery, grey-green necrotic spots with brown borders, mostly without preceding chlorosis. Necrotic areas increase quickly and flow together. Leaf parts which are not subjected to light, remain green.

Reasons
Commencing zinc deficiency on leaves

Zinc deficiency vs. optimum made worse by

Organic soils
High pH soils
Soils rich in phosphorus
Soils receiving high phosphorus application
Cold wet conditions

Zinc is important for

Enzyme activation, but also for synthesis of growth regulators

Yara recommended fertilizers for Zinc

YaraVita ZINTRAC 700

Lettuce (Field Grown): 1 l/ha when crop is 15 cm tall. Repeat application at 10-14 day intervals if necessary. Note: Final application to be made at least one month before harvest. Water rate: 30 to 200 l/ha.