Cauliflower - Necrosis
Symptoms
Leaf margins turn yellow to light brown, later dark brown. With ongoing deficiency the margin weathers and curls up.
Leaves are less waxy.
Causes
Potassium deficiency on leaves.
(photo: broccoli)
Cauliflower - Deformation
Symptoms
Potassium deficient white cauliflower shows light brown or white necrosis on the edges. Margins wither and curl up. Leaves are less waxy.
With ongoing deficiency necrosis progresses from the margins to the middle of the leaflets.
Causes
Severe Potassium deficiency on leaves.
(photo: cabbage)
Cauliflower - Necrosis
Symptoms
Leaf margins turn yellow to light brown, later dark brown. With ongoing deficiency the margin weathers and curls up.
Leaves are less waxy.
Causes
Potassium deficiency on young plant
Potassium deficiency 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
- Resistance to cold injury and drought
- High yields through increased biomass and head weight
- Consistent, early and evenly matured marketable crop
Yara recommended fertilisers for Potassium deficiency
YaraVita FOLIAR POTASH
Cauliflower: 5 l/ha at the 4 to 6 leaf stage. Repeat as required for moderate to severe deficiency at 7 to 14 day intervals. Water rate: 200 l/ha.
Read more about YaraVita FOLIAR POTASH
