Broccoli - Chlorosis
Symptoms
Youngest leaves show a faint yellowgreen tint.
Causes
Iron deficiency
Iron is the micronutrient needed in greatest quantities within brassicas, but deficiencies are rarely seen.
Lack of Fe is most frequent on light, alkaline and calcareous soils with low organic matter. However, soils with peat substrates have a naturally low Fe content.
High P fertilization may also induce Fe deficiency.
Iron deficiency made worse by
- High pH
- Water logged soils
- Calcareous soils
- High copper, manganese or zinc soils
Iron is important for
- Early leaf development and crop productivity
- Needed in relatively large amounts
