Phosphorus deficiency-Wheat | Yara South Africa

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Nutrients

Cereals - Growth retardation

Symptoms
Plants are stunted and show purple tints on their dark green leaves, veins and stems. The older leaves, affected first, often senesce prematurely.

Reasons
Phosphorus deficiency Spring cereals may show reddening/purpling of older leaves in cold weather. Root and stem damage or poor soil consolidation can cause similar symptoms, too.

Cereals - Growth retardation

Symptoms
Plants are stunted and show purple tints on their stems.

Reasons
Phosphorus deficiency on young plants Spring cereals may show reddening/purpling of older leaves in cold weather. Root and stem damage or poor soil consolidation can cause similar symptoms, too.

Cereals - Growth retardation

Symptoms
Plants with P deficiency are smaller than normal and show purple tints on their dark green leaves, especially on the middle of the leaf blade. K deficient leaves are even more stunted and their tips are scorched.

Reasons
P and K deficiency vs. optimum supply Spring cereals may show reddening/purpling of older leaves in cold weather. Root and stem damage or poor soil consolidation can cause similar symptoms, too.

Cereals - Growth retardation

Symptoms
Plants are stunted and show purple tints, especially on the middle of older leaves. Leaf veins and stems are concerned, too. Leaf size is dimished.

Reasons
Phosphorus deficiency Spring cereals may show reddening/purpling of older leaves in cold weather. Root and stem damage or poor soil consolidation can cause similar symptoms, too.

Cereals - Growth retardation

Symptoms
Ear size is severely stunted.

Reasons
Phosphorus deficiency (right)

Cereals - Growth retardation

Symptoms
Growth of deficient plants is severely stunted. Leaf color is a slightly paler than normal.

Reasons
Phosphorus deficiency in different levels (left) compared to healthy plant

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

Better crop establishment
Improved early root development
Improved yield
Even crop maturation

Yara recommended fertilizers for Phosphorus

YaraVita CROP BOOST

Cereals: 3 - 5 l/ha from the 2 leaf stage to 1st node detectable, (Zadok's G.S. 12 to 31). Repeat at 10 to 14 day intervals if necessary within this time-frame, up to a maximum of three applications. Water rate: 50 to 200 l/ha.

YaraVita TEPROSYN BIO

Cereals: 2 l/ha at the 4 to 6 leaf stage (Zadoks G.S. 14 to 16). Alternatively: 1 to 2 l/ha from 2 leaf stage to first node detectable (Zadok's G.S 12 to 31), repeated once or twice at 10 to 14 day intervals in cases of moderate to severe deficiency, within this timing. Water rate: 200 l/ha. Seed Dressing: 3-6 litres per ton.