Growing vegetables in a growth medium that is not natural soil is called hydroponic vegetable cultivation. Right from the name you have partly guessed how to grow vegetables by this method, right. The nutrients will be dissolved in water and supplied to plants instead of the usual soil usage. 

The hydroponic vegetable growing method is convenient in that growers do not need to adjust the pH of the plants because the buffer has the effect of keeping the stability of acid, besides the water is circulated continuously, so growers do not have to aerate to create oxygen. 

However, you still need to provide nutrients for water to nourish healthy plants. With each different type of vegetable grown, the nutrient requirements are also different.