To evaluate the effects of foliar application of iron and zinc on quantitative and qualitative characteristics of field pumpkin seed, an experiment was laid out as a randomized complete block design (RCBD) with three replications. Treatments included foliar application with ferrous sulfate (3 g l-1), zinc sulfate (3 g l-1), mixture of ferrous sulfate and zinc sulfate (3 g l-1), and water (control). This experiment was carried out at the Agricultural Research Station of Bu-Ali Sina University. The results indicated that foliar application had a significant effect on all characteristics except number of fruit plant-1. The highest number of seeds fruit-1, fruit diameter, fruit weight, weight of thousand seeds, oil percentage and grain and oil yields were achieved at the treatment of iron and zinc foliar application. By the way, the lowest values for above mentioned characteristics were obtained at control treatment (foliar application with water). Also, in comparison with control treatment, foliar application of both Fe and Zn increased significantly the concentrations of iron and zinc in seed. In general, consumption of both ferrous sulfate and zinc sulfate as a foliar application in the field pumpkin cultivation, could increase seed oil percentage, seed iron concentration, seed zinc concentration and oil yield.
