Organic farming has become very popular over the past two decades because of concerns about conventional agriculture. The increasing production and application of chemical and synthetic fertilizers and pesticides induced many negative consequences. Food safety and health and environmental health are the main goals of organic agriculture. Wood vinegar is an absolute organic substance with many properties that make it a good alternative to the chemicals harmful for the environment, humans and livestock. Cucumber ( Cucumis sativus-L .) has a major share in the consumer market and is the fourth most important vegetable in terms of production after tomatoes, kale and onions. Due to this important position, it seems necessary to find useful and effective solutions to increase its quality and production. In this study the effects of foliar application of wood vinegar on iron and zinc nutrition as well as some yield parameters of cucumber were investigated. After one week of plant establishment in nutrient solution, 7 treatments with 4 replications were applied. The treatments were: T1 (control, complete Johnson nutrient solution and foliar application of water), T2 (complete nutrient solution and foliar application of wood vinegar), T3 (zinc deficiency and foliar application of zinc sulfate), T4 (zinc deficiency and foliar application of zinc sulfate and wood vinegar), T5 (iron deficiency and foliar application of wood vinegar), T6 (zinc deficiency with no foliar application) and T7 (iron deficiency with on foliar application). The applied wood vinegar concentration was 10/1000 and zinc sulfate at 1 g/ lit. Foliar spraying was done once a week for totally 4 times. The results showed that the iron concentration of cucumber shoot increased by foliar application of wood vinegar, zinc sulfate and combination of both substances. Also, foliar application of zinc sulfate alone or in combination with wood vinegar increased the concentration of iron in roots. Leaf nutrition of these two substances was also effective on increasing fruit iron. The results showed an increase in zinc concentration of cucumber shoots by foliar application with wood vinegar compared to the control. Combined (zins sulfate and wood vinegar) leaf feeding also increased zinc concentration in cucumber shoots. The results also showed that wood vinegar increased the concentration of zinc in the roots in iron deficiency treatment but zinc sulfate decreased the concentration of zinc in the roots either alone or in combination with wood vinegar. Wood vinegar was able to increase the concentration of zinc in the fruits and carotenoids contents of the leaves. Also, foliar application of wood vinegar increased the amount of dry matter in fruits and roots. The results indicate that wood vinegar was effective in increasing the concentration of iron and zinc in symplast and apoplast (one and a half times for Fe and twice for Zn in apoplast ). Keywords: wood vinegar, cucumber, iron and zinc, hydroponics, organic agriculture