The response of some parameters of Sesame (Sesamum indicum L.) cultivar's leaf to nitrogen and bio fertilizer applications

In order to analyze some leaf physiological parameters of Sesame cultivars under the influence of bio fertilizer and nitrogen applications an experiment was arranged in a split-split plot based on a randomized complete block design with three replications under filed conditions. Nitrogen fertilizers (0, 60, 90 and 120 kg ha-1) were as main plots and Supernitroplus bio fertilizer as sub-plots (with and without bio fertilizer) and Sesame cultivars (Naz, Oltan and Varamin 2822) in sub sub-plots. The maximum leaf dry weight, stem dry weight and leaf area were recorded for Varamin cultivar while Varamin and Oltan cultivars did not have any significant differences for leaf dry weight to stem ratio. Oltan cultivar had the lowest specific leaf area that indicates more efficient photosynthetic system. Application of bio fertilizer significantly enhanced the leaf dry weight. Significant interaction between cultivar and nitrogen for the indices under study showed that higher levels of nitrogen (90 and 120 kg N ha-1) in Oltan and Naz cultivars vs. Varamin cultivar caused a more favorable growth index. Therefore, it might be concluded that production of extra leaf in Varamin cultivar is not a superiority parameter for photosynthesis, thus changes in this parameters with nitrogen and bio fertilizer could ensure optimum yield.