Effects of potassium and iron applications on nutrient concentrations of tomato plants grown in soilless culture

The aim of this study was to investigate effect of K applications on plant Fe uptake and effects of K and Fe applications on mineral nutrition of tomato plants grown in soilless culture. Different combinations of potassium (150, 300, 450 mg L^-1) and iron (1, 2, 3 mg L^-1) ratios were evaluated. Results showed that N concentration of plant was increased by K application while iron applications were decreased. There were no effects of K and Fe applications on P, Ca, Mg, Zn, Mn concentrations of stem, and P, Mn concentrations of leaf. K concentrations of plant were increased by K applications. Fe concentration of plant was not affected by K applications. Leaf Ca and Mg concentrations decreased depending on K and Fe aplications. As a result, high level of K and Fe applications caused antagonistic effect on nutrient uptake and resulted in imbalance on mineral nutrition of tomato plants.