Potassium deficiency-Potatoes | Yara New Zealand

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Nutrients

Potatoes - Deformation

Symptoms
Edges and tips of the lower leaves become yellow and later necrotic. Eventually, the marginal yellowing spreads between the veins as the deficiency progresses. Leave margins curl up. The leaves often wither and collapse prematurely. Plant growth is squat and stunted.

Reasons
Potassium deficiency

Potatoes - Discolouration

Symptoms
Potassium deficient tubers show black spots. When cut, they blacken rapidly. The spots mostly occur near the vascular ring at the stolon end of the tuber.

Reasons
Black spot due to potassium deficiency

Potatoes - Deformation

Symptoms
Edges and tips of the lower leaves become yellow and later necrotic. Eventually, the marginal yellowing spreads between the veins as the deficiency progresses. Leave margins curl up. The leaves often wither and collapse prematurely. Plant growth is squat and stunted.

Reasons
Potassium deficiency

Potatoes - Deformation

Symptoms
Edges and tips of the lower leaves become yellow and later necrotic. Eventually, the marginal yellowing spreads between the veins as the deficiency progresses. Leave margins curl up. The leaves often wither and collapse prematurely. Plant growth is squat and stunted.

Reasons
Potassium deficiency

Potassium deficiency made worse by

Acidic soils (low pH)
Sandy or light soils (leaching)
Drought conditions
High rainfall (leaching)
or heavy irrigation
Heavy clay (illite) soils
Soils with low K reserves
Magnesium rich soils

Potassium is important for

Improved yield and quality
Increased tuber size
Improved disease resistance

Yara recommended fertilizers for Potassium

YaraVita CROPLIFT-K

Potatoes: 5 kg/ha. Apply during bulking and repeat as necessary at 7 to 10 day intervals. Water rate: 200-500 l/ha.

Read more about YaraVita CROPLIFT-K

YaraMila 8-11-20

Potatoes: For specific rates and timing contact your local Yara stockist.

Read more about YaraMila 8-11-20

YaraMila COMPLEX

Potatoes: For specific rates and timing contact your local Yara stockist.

Read more about YaraMila COMPLEX

Other recommended products

YaraVita CROPLIFT

Potatoes: 2.5 to 5 kg/ha. Repeat at 10 to 14 day intervals as necessary. Avoid applications during flowering. Water rate: 200 l/ha.

YaraVita MAGPHOS K

Potatoes: To stimulate early growth: 5 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 or 1 to 2 applications of 10 l/ha during tuber bulking ( as soon as first formed tubers are 10mm in diameter) and following petiole analysis during tuber bulking. Allow 10 to 14 days between applications. Water rate: 200 l/ha.

YaraMila 12-10-10

Potatoes: For specific rates and timing contact your local Yara stockist.

YaraTera KRISTA K PLUS

Potatoes: For specific rates and timing contact your local Yara stockist.

YaraTera KRISTA MKP

Potatoes: For specific rates and timing contact your local Yara stockist.

YaraTera KRISTALON BLUE

Potatoes: For specific rates and timing contact your local Yara stockist.

YaraTera KRISTALON ORANGE

Potatoes: For specific rates and timing contact your local Yara stockist.

YaraTera KRISTALON RED

Potatoes: For specific rates and timing contact your local Yara stockist.

YaraTera KRISTALON WHITE

Potatoes: For specific rates and timing contact your local Yara stockist.

YaraTera KRISTALON YELLOW

Potatoes: For specific rates and timing contact your local Yara stockist.