What kind of nutrients do you need for hydroponics?

Image by D-Lab
The girls in Yayulihuí Alto really latched onto hydroponics! They said they don’t get to build stuff for classes very often. They made some changes to the system to figure out a new way to hold up the top cup. It was really cool to see them experiment. Date: 2010/01/09
Photo Credit: Helen DCouto?

Question by Morte et Dabo: What kind of nutrients do you need for hydroponics?
My group at school is starting a floating hydroponics garden, we already have the idea approved but we need to know what kind of nutrients we would need and where would be a good place to buy them?

Feel free to answer in the comment section below