In this study, an examination was made of the effects of various iron fertilizers on the iron content of the various organs of tangerine plants. To this purpose, four different iron fertilizers [Fe-Citrate, FeSO4.7H2O, Fe-EDTA and Fe-EDDHA (Sequestren)] were applied to Satsuma plants. At the end of the experiment, the effects of the applications on the Fe and active Fe content of the roots, stems and leaves were examined. In addition, apoplastic Fe in the leaves was determined. Results showed that the highest values of all three parameters (total, active and apoplast Fe) were provided by Fe-EDDHA. The research showed that iron applied to the leaves affected active and apoplastic content in the order Fe-EDDHA (sequestren)>Fe-EDTA>FeSO4.7H2O>Fe-Citrate. Fe-EDTA followed the application of Fe-EDDHA. The highest total values of iron content in the roots were provided by Fe-Citrate and Fe-Sulfatin. Evaluation showed that Fe-EDDHA (sequestren) had a greater effect than the other Fe-containing fertilizers.
Key words: Satsuma tangerines (Citrus unshiu Marc.), iron, iron-containing fertilizers, active iron, apoplastic iron, chlorophyll.
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