Effect of iron and nitrogen application on quantitative and qualitative characteristics of apple " cv. Fuji"

Effect of three different levels of Fe-EDDHA foliar application and soil application of nitrogen on some quantitative and qualitative characteristics of apple (cv. Fuji) grafted on Maling-9 was evaluated. This experiment carried out at the experimental field of Tehran University, in 2013. The factorial experiment was carried out as randomized completely block design (RCBD) with three replications. Results showed that iron application separately increased total phenolic content and dry matter (%) but had no significant effect on other physiochemical parameters. Nitrogen application separately increased fruit firmness, total phenolic content, dry matter, fruit length, peel yellowness and decreased ascorbic acid and peel blush. Interaction effect of iron and nitrogen on the fruit firmness, total phenolic content, ascorbic acid, dry matter, yield, fruit height and peel color parameters like a, b was significant. It can be concluded that, nitrogen application at 60 mg/kg in each tree was suitable for improving the quality indexes for this cultivar but three doses of iron in this study were dilute for improving the quality indexes of the fruit.