Interaction of drought stress and zinc on yield, yield components and harvest index in maize plant mycorrhiza

In order to study of different levels of zinc on yield, yield components and harvest index in maize plant mycorrhiza under drought stress, an experiment was carried out in research farm of Arak Islamic Azad University in 2006. The experiment was laied out in factorial based on RCBD with three replications. The treatments were consisted as three levels of irrigations(irrigation equal of crop water requirementcv as control, irrigation equal of 75% crop water requirement and irrigation equal of 50% crop water requirement), inoculation with mycorrhiza fungi (Glumus intraradices) at two levels (inoculation with and without mycorrhiza) and zinc sulphate at three levels (0, 25 and 45 kg/ha). The result showed that, drought stress reduced harvest index, yield and yield components significantly. Effects of mycorrhiza fungi on traits of number of grain per row, number of grain per ear, ear weight and grain yield was significant. Inoculation with mycorrhiza improved measured traits as compared to treatment of without mycorrhiza not only in condition of optimum irrigation but also drought stress. Using of mycorrhiza and zinc sulfate alone in condition irrigation control increased traits of measured. It was showded that with irrigation equal 75% water requirement, inoculation with mycorrhiza and 45 kg/hazinc sulfate obtain optimum yield.