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Wikipedia definition
1. Nutrient film techniqueNutrient Film Technique or NFT is a hydroponic technique wherein a very shallow stream of water containing all the dissolved nutrients required for plant growth is re-circulated past the bare roots of plants in a watertight gully, also known as channels. In an ideal system, the depth of the recirculating stream should be very shallow, little more than a film of water, hence the name 'nutrient film'.
Read “Nutrient film technique” on English Wikipedia
Read “薄膜水耕” on Japanese Wikipedia
Read “Nutrient film technique” on DBpedia

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