Potassium deficiency on orange-Citrus

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Nutrients

Citrus - Chlorosis

Symptoms
With potassium deficiency leaf margins of the older leaves turn pale yellow or sometimes bronze. With ongoing deficiency cholorosis spreads over the whole leaves.

Reasons
Potassium deficiency

Citrus - Chlorosis

Symptoms
With potassium deficiency leaf margins of the older leaves turn pale yellow or sometimes bronze. With ongoing deficiency cholorosis spreads over the whole leaf.

Reasons
Potassium deficiency

Citrus - Cracking

Symptoms
Vertical splitting beginning at the blossom end and opening longitudinally towards the stem end.

Reasons
Potassium deficiency on fruit Potassium nutrition influences fruit size, peel thickness and fruit color. Some fruit disorders are likely to occur under low potassium conditions or high N:K rations resulting in less marketable fruit: - smaller fruit - increased peel thickness - creasing - splitting

Citrus - Deformation

Symptoms
Fruit shows narrow sunken furrows on the rind surface. Therefore processing is more difficult as the peel disintegrates.

Reasons
Potassium deficiency Creasing, the separation of the albedo from the outer peel, can be caused by a lack of potassium, calcium or boron.

Potassium deficiency on orange 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

Larger leaf area maintaining through season
Shoot growth more vigorous
Fruit load increase/benifit to yield
Fruit are larger with better colour, skin texture and flavouring (more acidity)
Level of vitamin C increases

Yara recommended fertilizers for Potassium

YaraRega AQUAFLEX 13

Citrus: Exact recommendation depends on soil analysis, yield potential, fertigation practices and nutrient management plan. Refer to your local Yara Agronomist for detailed recommendation.

YaraRega AQUAFLEX 18

Citrus: Exact recommendation depends on soil analysis, yield potential, fertigation practices and nutrient management plan. Refer to your local Yara Agronomist for detailed recommendation.

YaraVita CROP BOOST

Citrus: 5 l/ha applied at 10 to 14 day intervals following fruit set. Water rate: 500 l/ha minimum. Alternatively, 125ml/100 litres applied at 10 to 14 day intervals following fruit set, based on a typical TRV of 2500 l/ha and a maximum TRV of 4000 l/ha.