Interveinal chlorosis of younger leaves is the typical symptom of deficiency. Excess accumulation is rare but could cause bronzing or tiny brown spots on leaf surface. Manganese Manganese is involved in the oxidation reduction process in the photosynthetic electron transport system. Biochemical research shows that this element plays a structural role in the chloroplast membrane system, and also activates numerous enzymes. Interveinal chlorosis of younger leaves, necrotic lesions and leaf shredding are typical symptom of this deficiency.
High levels can cause uneven distribution of chlorophyll resulting in blotchy appearance.
Zinc Zinc plays a roll in the same enzyme functions as manganese and magnesium. More than eighty enzymes contain tightly bound zinc essential for their function. Zinc participates in chlorophyll formation and helps prevent chlorophyll destruction. Carbonic anhydrate has been found to be specifically activated by zinc. Deficiencies appear as chlorosis in the interveinal areas of new leaves producing a banding appearance.