Phosphorus deficiency-Wine Grape

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Nutrients

Grape - Number reduced

Symptoms
P deficiency reduces fertility and fruit setting considerously, resulting in poor yield.

Reasons
Phosphorus deficiency.

Grape - Discolouration

Symptoms
P deficiency results in reduced growth and dark green leaves, often with some bronzing to purple lesions on the leaf blades. Discoloration starts at the margins and spreads over the interveinal areas. The leaves become hard and stiff. Dormant buds contain only small flower primordia what reduces the performance of the vines.

Reasons
Phosphorus deficiency Phosphorus deficiency occurs rather seldom in the fields.

Phosphorus deficiency made worse by

Acidic or very alkaline (calcareaus) soils
Low organic matter
Cold or wet conditions
Crops with a poorly developed root system
Soils with low P reserves
Soils with a high phosphate capacity
Iron rich soils

Phosphorus is important for

Healthy green foliage
Improved fruit set
Improved quality

Yara recommended fertilizers for Phosphorus

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.

YaraVita® MAGPHOS™

Vines: 2 to 5 applications of 1-2 quarts/acre at 10-14 day intervals beginning at early shoot growth, flower buds separated and stretching, after berry set, berry size and early veraison before harvest. Water rate: minimum 20 gallons/acre.

YaraVita® SENIPHOS™

Vines: 2-4 quarts/ac beginning at cluster elongation. Continue thru fruit sizing on a 14-21 day interval thru veraison. Water rate minimum 50 gal/ac.

NUTRA-PHOS CALZINC

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.