Corn
- Corn
Corn - Discolouration
Symptoms
Severely affected leaf (left) shows red and purple tints with interveinal streaky lesions. Whilst mildly affected leaf (centre and right) shows interveinal chlorosis and streaky lesions only.
Reasons
Magnesium deficiency.
Iron and manganese deficiencies show similar symptoms but begin at younger leaves.
Magnesium deficiency made worse by
- Sandy soils
- Acidic soils
- Potassium rich soils
- Soils receiving high potash applications
- Cold wet periods
Magnesium is important for
- Good plant development early in the season
- Improves yield
- Brings forward harvest date