Effects of Drought Stress and Foliar Application of Iron and Zinc on Quantitative and Qualitative Characteristics of Two Species of Annual Medics

In order to evaluate of drought stress and foliar application of zinc and iron on two annual medics species, a field experiment was carried out with split factorial based on randomized complete block design in three replications with treatments of foliar application (Controlled, Fe, Zn and Fe + Zn) with 5 gr/liter concentration in vegetative stage and cut off irrigation from (50% flowering, lower pod maturity, 10 days before starting of flowering and control treatment). Drought stress was considered as a main plot and combination of factorial between foliar application and two annual medics species as a subplot.The results showed that leaf to stem ratio in scutellata (1.82) was more than polymorpha (1.43). Drought stress reduced 27% and 33% forage fresh weight and pod yield in comparison with control, respectively. The number of pods per plant increased 17.6 and 27.6 percent incomparison with control in iron and iron + zinc treatments, respectively. Zinc application treatment in drought stress control increased the number of pod per plant in scutellata and polymorpha species 181% and 277%, respectively in copmarison with control treatment. The results showed that seed per pod increased 58% in Fe + Zn treatment in polymorpha species but those increased 40-70% in total foliar application to control in drought stress control. The nitrogen fixation in the thirth level of drought stress was reduced 51% in scutellata and polymorpha, respectivelly compared to control. Iron+Zinc application increased protein forage 23.3% and 21.7% in scutellata and polymorpha in fourth level of drought stress, respectively.