Potassium deficiency-Tomato | Yara United States

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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 around the peduncle remain green or yellow. The flesh underneath is hard and tasteless. 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

YaraMila® 15-15-15

Tomato (field grown): Apply 300-1000 lbs YaraMila® 15-15-15/acre according to variety, yield potential, and soil test. YaraMila® 15-15-15 provides a balanced nitrogen approach by supplying both nitrate and ammoniacal nitrogen along with fully available Phosphate, soluble Potassium and Sulfur in a homogenous prill. Consult with your agronomist for local recommendations.

YaraMila® 21-7-14

Tomato (field grown): Apply 225-950 lbs YaraMila® 21-7-14 /acre in split applications according to variety, yield potential, and soil test. Utilizing YaraMila® 21-7-14 provides a balanced nitrogen approach by supplying both nitrate and ammoniacal nitrogen along with fully available Phosphate, soluble Potassium and Sulfur in a homogenous prill. Consult with your agronomist for local recommendations.

YaraVita® MAGPHOS™

Tomatoes (field grown): 1-2 quarts/acre. Apply at the 4 to 6 leaf stage with repeat applications at 10 to 14 day intervals if necessary. Water rate: 3 to 50 gallons/acre.

NUTRA-PHOS Zn-K PLUS

Tomato (field grown): 3 to 10 lb. per acre per application. One to three applications are advised at 3 to 4 week intervals, starting at period prior to bloom. Repeat as needed. Apply aerial applications in at least 5 gallons/acre and ground applications in at least 10 gallons/acre; however, when total application gallonage is 25 gallons per acre or less, DO NOT mix more than 1 lb. of this product per gallon of water.

SULFATE OF POTASH - GRANULAR 0-0-50

Tomato (field grown): Apply up to 100-425 lbs Sulfate of Potash/acre according to soil analysis throughout the growing season. Utilizing Sulfate of Potash from Yara for part or all of your potassium needs provides your crop with water soluble potassium along with sulfate sulfur. Consult with your agronomist for local recommendations.

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