In order to study the effects of iron sulfate spraying on the yield and yield components in three cultivars of dryland wheat, an experiment in the form of random complete block design (RCBD) as a split plot with three replications and twelve treatments was conducted in the crop year 2011-2012. The main plot of the spraying treatment was at four levels of marker (without spraying), spraying with such concentrations as 2/1000, 4/1000, and 6/1000, and the sub-plot of the wheat cultivar was at such three levels as Azar 2, Kouhdasht, and Zagros. Variance analysis was conducted for wheatear length, wheatear weight, number of wheatears per square meter, number of grains per wheatear, and 1000-grain weight. Moreover, their means were compared by Duncan test. Data analysis showed that spraying treatment has a significant effect on grain yield, and proves significant at one percent level. The maximum grain yield is 8125 kg/ha, belonging to the spraying treatment with a concentration of 6/1000 (m4v3), and the minimum grain yield belongs to the marker treatment and Azar 2 cultivar, being 4364 kg/ha. The increase of spraying concentration has positive effect on all the treatments under study, and increases the yield.
