Potassium deficiency-Tomato | Yara New Zealand

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Nutrients

Tomato - Chlorosis

Symptoms
The older leaves become chlorotic, later necrotic, starting from the leaf edges. At severe deficiency, the intercostal areas of the leaves may become chlorotic, too. Whitish, necrotic dots develop within the chlorotic areas.

Reasons
Potassium deficiency on the leaves. Excess salinity may cause similar symptoms, this can be controlled by measuring the electrical conductivity (EC) of the nutrient solution.

Tomato - Chlorosis

Symptoms
The older leaves become chlorotic, later necrotic, starting from the leaf edges. At severe deficiency, the intercostal areas of the leaves may become chlorotic, too. Light brown and whitish, necrotic dots develop within the chlorotic areas.

Reasons
Potassium deficiency on the leaves. Excess salinity may cause similar symptoms, this can be controlled by measuring the electrical conductivity (EC) of the nutrient solution.

Tomato - Discolouration

Symptoms
Glasshouse grown tomatoes will often express potassium deficiency as blotchy ripening. When fruits turn red some areas remain green. The symptoms are sometimes visible in field grown tomatoes, too.

Reasons
Potassium deficiency on fruits

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

Coenzyme functions
Protein synthesis
Stomatal function
Tugor potential
Sugar degree

Yara recommended fertilizers for Potassium

YaraVita CROPLIFT

Tomato (Field Grown): 1 kg/ha 3 to 4 days after transplanting. Water rate: 200 to 400 l/ha. Also, one to two applications, at 10 to 14 day intervals, of 1 to 2 kg/ha before flowering and again during fruit development. Water rate: 400 l/ha.

YaraVita CROPLIFT-K

Tomato (field grown): 5 kg/ha. Commence applications at flowering of second truss and repeat as necessary at 7 to 10 day intervals. Water rate: 200-500 l/ha.

YaraMila COMPLEX

Other recommended products

YaraVita MAGPHOS K

Tomato (Field Grown): 5 l/ha. Apply at the 4 to 6 leaf stage with repeat applications at 10 to 14 day intervals if necessary. Water rate: 30 to 500 l/ha

YaraMila 8-11-20

YaraTera KRISTA K PLUS

YaraTera KRISTA MKP