Phosphorus deficiency-Table Grape

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Nutrients

Grapevines - Number reduced

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

Reasons
Phosphorus deficiency

Grapevines - 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

YaraTera KRISTA MAP

Grapevines: Apply 60-150 kg/ha in multiple applications from growth stage; early shoot growth to post harvest. Refer to Yara crop program as a guide or contact your local Yara sales agronomist for advice.

YaraTera KRISTA MKP

Grapevines: Contact your local Yara sales agronomist for advice.