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- Iron (Fe) is the most commonly deficient micronutrient β causes yellowing of new growth (chlorosis)
- Iron must be in chelated form (EDTA, DTPA, EDDHA) to remain soluble at higher pH
- Manganese and Zinc are required for enzyme function and photosynthesis
- Boron is critical for cell wall formation and pollen viability
- Molybdenum is needed for nitrogen metabolism β deficiency causes cupped or twisted leaves
- Micronutrient deficiencies often appear when pH is outside the 5.5β6.5 optimal range