Potassium deficiency-Wine Grape | Yara United States

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Nutrients

Grape - Chlorosis

Symptoms
Intercostal chlorosis starts on the leaf margins and spreads to the internal area of mature leaves. At the margins, necrotic zones develop. The veins remain green for a certain time. Potassium deficiency results in different symptoms, dependent on the date of appearance and the weather conditions.

Reasons
Potassium deficiency

Grape - Necrosis

Symptoms
Interveinal yellowing (white vine varieties) or reddening (red varieties) starts on the leaf margins and spreads over the internal area of older leaves. The veins remain green for a certain time. Later, necrotic areas appear on the leaf margins, which perforate easily. Symptoms of slight deficiency are shown on leaves near grapes firstly. Generally potassium deficiency symptoms are most apparent in mid to late summer.

Reasons
Potassium deficiency.

Grape - Chlorosis

Symptoms
Interveinal yellowing (white vine varieties) or reddening (red varieties) starts on the leaf margins and spreads over the internal area of older leaves. The veins remain green for a certain time. Later on the leaf margins necrotic areas appear, which perforate easily. Symptoms of slight deficiency are shown on leaves near grapes firstly. Generally potassium deficiency symptoms are most apparent in mid to late summer.

Reasons
Potassium deficiency.

Grape - Necrosis

Symptoms
Interveinal yellowing (white vine varieties) or reddening (red varieties) starts on the leaf margins and spreads over the internal area of older leaves. The veins remain green for a certain time. Later on the leaf margins necrotic areas appear, which perforate easily. Symptoms of slight deficiency are shown on leaves near grapes firstly. Generally older leaves are affected first.

Reasons
Potassium deficiency Very sandy soils and those that have been leveled (removing the topsoil) suffer worst from potassium deficiency. Deficiencies are most apparent in mid to late summer.

Grape - Necrosis

Symptoms
Interveinal yellowing (white vine varieties) or reddening (red varieties) starts on the leaf margins and spreads over the internal area of older leaves. The veins remain green for a certain time. Later on, the leaf margins and intercostal areas become necrotic and perforate easily. Symptoms of slight deficiency are shown on leaves near grapes firstly. Generally older leaves are affected first. K deficiency is one reason among others for a physiological disorder that makes the grape berries wilt and dry.

Reasons
Potassium deficiency Very sandy soils and those that have been leveled (removing the topsoil) suffer worst from potassium deficiency. Deficiencies are most apparent in mid to late summer.

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

Healthy green foliage
Important for fruit size, development and yield
Reduction of fungal diseases
Improved sugar content of berries
Improved maturation of berries
Needed in great quantities

Yara recommended fertilizers for Potassium

YaraMila® 15-15-15

Table Grapes: Apply 300-600 lbs YaraMila® 15-15-15/acre according to vine age, expected yield, and soil test. Apply 50% of the product prior to bud break and the remainder post-bloom. 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. Wine Grapes: Apply 200-500 lbs YaraMila® 15-15-15/acre according to variety, vine age, expected yield and soil test. Apply 50% of product prior to bud break and the remainder post-bloom. 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

Table Grapes: Apply 225-450 lbs YaraMila® 21-7-14 /acre according to vine age, expected yield, and soil test. Apply 50% of product prior to bud break and the remainder post-bloom. 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. Wine Grapes: Apply 140-380 lbs YaraMila® 21-7-14 /acre according to variety, vine age, expected yield and soil test. Apply 50% of product prior to bud break and the remainder post-bloom. Use 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

Grapevines: 5 to 15 lb. per acre per application. First application when new shoots are in the 4- to 6-leaf stage. 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

Table Grapes: Apply up to 200-1000 lbs Sulfate of Potash/acre at vineyard establishment according to variety and soil analysis. Apply 130-425 lbs Sulfate of Potash /acre in split applications to established vineyards in split applications. 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. Wine Grapes: Apply up to 200-1000 lbs Sulfate of Potash/acre at vineyard establishment according to variety and soil analysis. Apply 130-425 lbs Sulfate of Potash /acre in split applications to established vineyards in split applications. 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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