Broccoli
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Broccoli - Chlorosis
Symptoms
Older Leaves show a yellow to brown, well defined border zone.
With ongoing deficiency necrosis progresses from the margins to the middle.
Reasons
Potassium deficiency
Brassicas have a relatively high K-requirement lasting through head formation and enlargement. Good K supply results in a more consistent, marketable crop with better inner and outer quality.
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