Zinc Deficiency - Zinc in potatoes

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Nutrients

Potatoes - Chlorosis

Symptoms
Younger leaves show interveinal chlorosis and necrosis which occurs in irregular patches. Whitish spots develop within the brown necrotic tissue. Symptoms may also start on older leaves.

Reasons
Zinc deficiency. Generally the leaves are smaller with Zn deficiency, and the plants are stunted in growth.

Potatoes - Deformation

Symptoms
Younger leaves show interveinal chlorosis and tipburn. Whitish spots can develop within the brown necrotic tissue. The leaf blades are small, narrow and cupped upward. Shoots can be stunted.

Reasons
Zinc deficiency. Generally the leaves are smaller with Zn deficiency, and the plants are stunted in growth.

Potatoes - Deformation

Symptoms
With zinc deficiency, leaves are smaller and growth is stunted. The leaves are deformed and fold inwards ('fern leaf of potato' ). Greyish brown to bronze coloured blotches appear first on the middle of the leaves, later all over the foliage.

Reasons
Zinc deficiency. In potatoes, zinc deficiency symptoms are variable. Generally the leaves are smaller and the plants are stunted in growth.

Potatoes - Deformation

Symptoms
Younger leaves show interveinal chlorosis. Whitish spots can develop within the affected tissue. The leaf blades are small, narrow and cupped upward.

Reasons
Zinc deficiency. In potatoes, zinc deficiency symptoms are variable. Generally the leaves are smaller and the plants are stunted in growth.

Potatoes - Deformation

Symptoms
With Zinc deficiency, leaves are smaller and growth is stunted. The leaves are deformed and folded inwards ('fern leaf of potato' ). Mature leaves are affected most: greyish brown to bronze coloured blotches appear first on the middle of the leaves, later all over the foliage. Leaf blades show interveinal chlorosis.

Reasons
Zinc deficiency. In potatoes, zinc deficiency symptoms are variable. Generally the leaves are smaller and the plants are stunted in growth.

Zinc deficiency made worse by

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

Zinc is important for

Healthy green foliage
Improved tuber yield and quality

Yara recommended fertilizers for Zinc

YaraVita® MANCOZIN™

Potatoes: 1 pt/acre at one week after 100 percent emergence and following petiole analysis during tuber bulking. For moderate to severe deficiency repeat applications at 10 to 14 day intervals. Water rate: 3 to 25 gallons per acre.

YaraVita® ZINTRAC™

Potatoes: 1 pint/acre one week after 100% emergence. For moderate to severe deficiency, repeat applications may be necessary at 10 to 14 day intervals. Water rate: 3 to 20 gallons/acre. For use in Wisconsin: YaraVita Zintrac can be applied to this crop in Wisconsin requiring a medium to high level of zinc.