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Abstract
Banksia ericifolia seedlings were grown in a pine bark‐based soilless medium amended with 10, 20, and 40 mg/L P, each combined with 26 Iron sources. Fe deficiency symptoms increased with increases in added P. Only eight Fe sources ‐ three types of ferrous sulfate, two magnetites and three chelates based on EDTA and EDDHA ‐ provided enough Fe to give high quality plants. Among sources based on ferrous sulfate only those that gave at least 15, 22, and 34 mg/L Fe in 2mM DTPA extracts of media amended with 10, 20, and 40 mg/L P, respectively, produced high quality plants. DTPA extracts of media containing magnetites had to contain more than 14, 19, and 25 mg/L Fe at the same P levels. For Fe chelates of EDTA, EDDHA, and lignosulfonate, freedom from Fe deficiency was not related to extractable Fe.