Phosphorus deficiency-Wine Grape

Change crop

Nutrients

Wine Grape - Number reduced

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

Reasons
Phosphorus deficiency

Wine 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

YaraVita MAGPHOS K

Grapevines: 3 to 5 l/ha at flower buds visible, flower buds separated, fruit set, grape expansion, early veraison (one month before harvest) and 10 to 14 days later. Water rate: 200 l/ha.

YaraMila COMPLEX

Other recommended products

YaraVita CROPLIFT

Grapevines: 2.5 to 5 kg/ha and repeat at 10 to 14 day intervals as required until pre-harvest. Avoid applications during flowering. Water rate: 500 to 1000 l/ha

YaraVita CROPLIFT-K

Grapevines: 5 kg/ha from fruit set and repeat at 10 to 14 day intervals as required until pre-harvest. Water rate: 500-1000 l/ha.

YaraTera KRISTA MKP

YaraTera KRISTALON BLUE

YaraTera KRISTALON ORANGE

YaraTera KRISTALON RED

YaraTera KRISTALON WHITE

YaraTera KRISTALON YELLOW