NFT
Nutrient film technique (NFT) involves growing plants by maintaining a coating of nutrient solution around the roots, without the use of a substrate.
The system consists of a trough on a slope of 0.3%–2%; the roots of the plant lie inside the bottom of this trough. Nutrient solution is continually applied at the elevated end so that the solution flows down through the trough at exactly the rate required to keep the roots completely wet. At the bottom end of the trough, the solution is allowed to drain. The nutrient solution layer should be as thin as possible, almost as a film. The width of the trough varies according to the crop; troughs of 4–8 cm are sufficient for crops such as lettuce.
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