Potassium deficiency-Strawberries

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Nutrients

Strawberries - Necrosis

Symptoms
As a first symptom margins of mature leaves turn brown and dry. The browning progresses inwardly between the veins.

Reasons
Potassium deficiency. Potassium deficient leaves contain less than 0.5 % K. Magnesium deficiency and salt burn can produce similar symptoms.

Strawberries - Necrosis

Symptoms
As a first symptom margins of mature leaves turn brown and dry. The browning progresses inwardly between the veins. Almost at the same time the leaf base including the midrib and petiole darkens.

Reasons
Potassium deficiency. Potassium deficient leaves contain less than 0.5 % K. Magnesium deficiency and salt burn can produce similar symptoms.

Strawberries - Chlorosis

Symptoms
As a first symptom margins of mature leaves turn brown and dry. Light and dark brown sunken spots spread over the leaf blade. Interveinal chlorosis occurs.

Reasons
Potassium deficiency. Potassium deficient leaves contain less than 0.5 % K. Magnesium deficiency and salt burn can produce similar symptoms.

Strawberries - Chlorosis

Symptoms
As a first symptom margins of mature leaves turn brown and dry. Light and dark brown sunken spots spread over the leaf blade. Interveinal chlorosis occurs.

Reasons
Potassium deficiency. Potassium deficient leaves contain less than 0.5 % K. Magnesium deficiency and salt burn can produce similar symptoms.

Strawberries - Necrosis

Symptoms
With severe K deficiency the petiole and the leaf tissue at the leaf base become necrotic. The area adjacent to the midrib shows irregular chlorosis.

Reasons
Severe potassium deficiency<.br> Potassium deficient leaves contain less than 0.5 % K. Magnesium deficiency and salt burn can produce similar symptoms.

Strawberries - Necrosis

Symptoms
As a first symptom margins of mature leaves turn brown and dry. Light and dark brown sunken spots spread over the leaf blade.

Reasons
Potassium deficiency. Potassium deficient leaves contain less than 0.5 % K. Magnesium deficiency and salt burn can produce similar symptoms.

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 crop development
Increased yield
Improved fruit quality

Yara recommended fertilizers for Potassium

YaraMila® 15-15-15

Strawberry (field grown): Apply 400-1000 lbs YaraMila® 15-15-15/acre in split applications according to variety, yield potential, and soil test. Apply 50% prior to pegging, with the remainder side dressed. For perennial plantings, apply 20-30 lbs N/acre post harvest. Utilizing 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

Strawberry (field grown): Apply 285-950 lbs YaraMila® 21-7-14/acre in split applications according to variety, yield potential, and soil test. Apply 50% prior to pegging, with the remainder side dressed. For perennial plantings, apply 100-150 lbs YaraMila® 21-7-14/acre post harvest. 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.

NUTRA-PHOS Zn-K PLUS

Strawberry (field grown): 5 to 10 lb. per acre per application. Application after fruit starts to color may leave a visible residue. 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

Strawberry (field grown): Apply up to 100-300 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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