Some vegetables grown in a hydroponic system are low maintenance with reduced risk of disease and pest infestation often found in outdoor garden plants. The nutrient water provides all the moisture and food needed for the plant to produce large fruit. Hydroponic tomatoes, for example, which grow quickly in size and fruit production, are desirable for growing during the winter months when gardens are not prosperous. Tomato seedlings grown in soil are easily transplanted into hydroponic systems by removing soil from the roots.
Set up the hydroponic system according to the manufacturer's instructions. Fill the water reservoir and turn on the system to make sure it is in proper working order.
Test the pH of the water in the reservoir to verify it is 5.8 to 6.3, where tomatoes grow best. Add potassium hydroxide to increase pH, and phosphoric acid to decrease pH. Follow package instructions based on the amount of water in the system and current pH.
Add hydroponic tomato plant nutrients to the water following the package instructions for the amount of water in the system and reservoir. Monitor the nutrient level and add more when replenishing water in the reservoir.
Lift tomato seedlings from the growing container and remove all large chunks of soil. Rinse the roots gently with water to wash off remaining soil residue.
Fill the hydroponics netted pots half full of hydroponics medium. Set the tomato plant roots into the netted pots and carefully cover roots with hydroponics medium. Place the plants so the bottom sets of leaves are just above the top of the netted pots.
Place grow lights over the hydroponics system if the tomatoes grow in an indoor environment, as they require long light days for fruit productions. Ensure the lights are on for approximately 16 hours a day.