What principle got me here, is the interesting method and how I can apply it to hydroponics in deserts.

Welcome Felipe, where are you located? Sola Roof and hydroponics will conserve your water - but you do need a source - where would you get the water you need? Would you have access to seawater or brackish water? - Sola Roof Guy
By the way, please sign as "Author" with your full member name: Felipe Rojas, which is "FelipeRojas" in the Edit box, since that gives a hyperlink on Recent Changes.