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HS1208: Understanding and Applying Chelated Fertilizers Effectively Based on Soil pH

Figure 4. Effects of pH and chelate species, including EDTA, OTPA, and EDDHA, on chelated iron stability (A) and on crop yield (B).

Credit: (A) Havlin et al. (2005), Norvell (1972); (B) Havlin et al. (2005), Lindsay (1974)