Micronutrients for cannabis: iron for chlorophyll, manganese for photosynthesis, zinc for enzymes, boron for cell walls, copper and molybdenum for proteins.
Essential micronutrients: iron (chlorophyll), manganese (photosynthesis), zinc (enzymes), boron (cell walls), copper (proteins), molybdenum (nitrogen fixation). Deficits are rare with high-quality fertilisers. Chlorosis despite sufficient nitrogen indicates iron deficiency. Overdosing is toxic - follow the manufacturer's instructions.
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