Nutrient film technique (NFT)
Nutrient film technique (NFT) is a hydroponic technique wherein a very shallow stream of
water containing all the dissolved nutrients required for plant growth is continuously
circulated to the roots of plants in a watertight gutter, also known as channels. Typically the
depth of the re-circulating stream is slightly more than a film of water, hence the name
“nutrient film” technique. This feature of NFT allows the thick root mat that develops in the
bottom of the channel to have its upper surface exposed to suitable levels of humidity, and
allows an abundant supply of oxygen to the lower roots. A properly designed NFT system
is based on using the correct channel slope, flow rate, and channel length.