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Nutrient Film Technique (NFT)
The technique called Nutrient Film Technique (NFT) was developed by Dr Allan Cooper during the late 1960s at the Glasshouse Crops Research Institute in the U.K. In the NFT system a thin film of nutrient solution which contains the plant roots with no solid planting media flows through plastic channels. The root mat develops partly in the shallow stream of re-circulating solution and partly above it.
To maintain the nutrient film is extremely important because it ensures the root system has access to adequate oxygen levels. The key requirements in achieving a nutrient film situation are described by Cooper (1996) as being: “To ensure that the gradient down which the water flows is uniform and not subject to localized depressions, not even a depression of a few millimeters.” The rate of flow of inlet need not be so rapid to avoid water flowing down the gradient.
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