Effects of different iron sources on mineral concentration in gardenia (Gardenia jasminoides Ellis) plants EFROSSINI AVRAMAKI1*, CHRISTOS CHATZISSAVVIDIS2 and IOANNIS PAPADAKIS1 1 Department of Horticulture, School of Agriculture, Aristotle University, 54124, Greece 2 Department of Agricultural Development, Democritus University of Thrace, 68200 Orestiada, Greece Abstract In the present paper, the nutrient concentration of plant organs, when different Fe sources were used in gardenia (Gardenia jasminoides Ellis) plants grown in a hydroponic medium containing 1 mg l–1 Fe, was studied. Three Fe sources were applied, namely sequestrene-138 (6% Fe, Fe-EDDHA), sequestrene-330 (10%Fe, Fe-DTPA) and FeSO4·7H2O. The analytical data indicated that Fe and Zn concentrations in shoots were very low and were independent of the Fe source applied. Furthermore, K concentration of shoots was higher than K concentration of roots. It appears that in roots, the concentrations of Fe and Zn were very high. In roots, the lowest Fe concentration was found in the sequestrene-138-treated plants, whereas the highest one in the plants treated with FeSO4·7H2O.   < back .