This research has been discussed a growth promoting effect for agricultural products by discharge products. Ozone and nitrogen oxide was generated by dielectric barrier discharge from oxygen or air. These discharge products were dissolved in water as the bubble rises through the water. It was thought that sterilization of water and growth of agricultural products could be promoted by using the water containing ozone and nitrate ion for hydroponics. Radish sprouts and potherb mustard were used as agricultural products. The growth of agricultural products to the ozone concentration and nitrate ion concentration of the water used for hydroponics was discussed.