Model of cropping in nutrient solution is bringing roots
of plant immersion in a solution directly. This can be
done both recirculation and non-recirculation of
solvents. Non-recirculation of solvents has two types as
aerobic and anaerobic. Recirculation of solvents has two
types as deep flow technique (DFT) and nutrient film
technique (NFT). They increases oxygen to the plant
roots and keep them from elements precipitate. The
plant receives fully nutrients.