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