The NFT (Nutrient Film Technique) duct system consists of a series of channels where a thin film of nutrient is constantly recycled through them. Plants are placed in these channels in rockwool cubes. The cubes absorbs the nutrient and as the roots grow they enter the channels. From here they absorb nutrients, quickly developing larger root systems which form on the base of the channels.NFT is a very efficient growing system as the constant nutrient feed allows for simple maintainence, with constant root zone temperatures.This greatly aids plant growth with the potential to provide optimum uptake of nutrients.
Make sure you have a look at Nutriculture's NFT Infosheet for a handy summary of the essentials to get the best from growing with an NFT system.