Zinc deficiency-Potatoes | Yara South Africa

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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

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

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 on leaves

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 on leaves

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

YaraRega AQUAFLEX 13

Potatoes: Exact recommendation depends on soil analysis, yield potential and nutrient management plan. Refer to your local Yara Agronomist for detailed recommendation.

YaraRega AQUAFLEX 18

Potatoes: Exact recommendation depends on soil analysis, yield potential and nutrient management plan. Refer to your local Yara Agronomist for detailed recommendation.

YaraTera CHELATE 1089

Potatoes: Apply 2 kg/ha before planting (can be coated on pre-plant fertilizers) Apply a further 1 kg/ha at 3, 5, 7 weeks after planting. Can also be applied as a foliar application: Up to 150 g/100L water.

YaraTera CHELATE 1090

YaraTera REXOLIN Zn15

YaraVita CROP BOOST

Potatoes: To stimulate early growth: 10 l/ha one week after 100 percent crop emergence. To increase tuber number: 10 l/ha at tuber initiation (when 50 percent at the tip swellings are twice the diameter of the rest of the stolon). To increase tuber size: a minimum of 2 applications of 5 l/ha during tuber bulking ( as soon as first formed tubers are 10 mm in diameter) and following petiole analysis during tuber bulking. Allow 10 to 14 days between applications. Water rate: 200 l/ha.

YaraVita MANCOZIN

Potatoes: 1 l/ha at one week after 100% emergence and during tuber bulking. For moderate to severe deficiency repeat applications at 10 to 14 day intervals. Water rate: 200 l/ha.

YaraVita TRI-PHOLATE

Potatoes: Apply 2 kg/ha 1 week after 100% emergence. Apply a further 2 kg/ha at tuber initiation and a final 2 kg/ha at flowering. Water rate: 200 l/ha for tractor driven sprayer. 100,000 l/ha for application through irrigation system.

YaraVita ZINTRAC 700

Potatoes: Up to 1 l/ha, 1 week after 100% emergence. Water rate: 200 l/ha.