Abstract
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.
Highlights
A shortage of iron, as well as being a cause of anaemia and imbalances in the immune system, growth and mental development in animals, is a significant nutrition problem for plants and the soil (Black, 2003; Boccio and Iyenger, 2003)
An examination was made of the effects of various iron fertilizers on the iron content of the various organs of tangerine plants
Results of the study showed that the total amount of iron found in the leaves was higher in the Fe-Citrate, FeSO4.H2O, Fe-EDTA and Sequestren treatments than in the control (Table 3)
Summary
A shortage of iron, as well as being a cause of anaemia and imbalances in the immune system, growth and mental development in animals, is a significant nutrition problem for plants and the soil (Black, 2003; Boccio and Iyenger, 2003). In Turkey, iron deficiency is an important problem for the soil (Eyüpoğlu et al, 1997; Cakmak et al, 1999) and in the human population (Cavdar et al, 1983). In the world as a whole, 50% of land is arid or semiarid, and 25% suffers from iron deficiency as a result of the presence of lime. 30% of the world’s agricultural land is iron-deficient (Chen and Barok, 1982). Cell walls are composed of cellulose, hemicelluloses, pectin and proteins (Sakurai and Nevins, 1997; Carpita et al, 1996). 5 to 10% of plant tissue is consist of apoplast (Pitman et al, 1974; Grignon, 1991) and apoplast has an important effect on cation exchange capacity and passing into cells of ions (Sattelmacher et al, 1998)
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