The main disadvantage of using PVC as your grow tray is that the film will not evenly coat the roots. The roots in the middle would have access to a deeper depth of solution, while those closest to the edges would only have a shallow depth. This can cause uneven growth and weakness in your plants. By using a flat-bottomed channel, this problem is eliminated. Channels can also be easily built at home using simple materials such as 2×4”s and waterproof plastic lining.
Nutrient Film Technique uses tubes or channels instead of flat trays for the grow tray. This makes it easier to set it at an angle and to make sure that the nutrient solution flows directly to the roots without wasting any of it. Most often in DIY systems, a round tube or PVC pipe is used, with holes drilled to fit the net pots and seedlings. This has the advantage of being cheap and readily available to the home hobbyist.
You can either place seedlings directly into the holes of your PVC pipe or channel or for greater stability plant them in net pots and place the net pots in the holes. Most people do not use a growing medium with NFT, but let the roots fall directly through the net pots and onto the film. If you choose to use a growing medium, use it sparingly and make sure that the roots have plenty of room to fall through the bottom of the pot. Whichever way you choose to plant your seedlings, make sure to check and trim the roots often to prevent out of control growth that can clog the system.
The main components of an NFT system are the same as Ebb and Flow—the difference is their configuration.
Nutrient Film Technique works best if you choose plants that do not require a lot of support- lightweight, fast-growing plants that can be harvested quickly. If you want to grow plants such as tomatoes or squash, just make sure that you have proper support systems in place such as trellises. The roots are not suspended in a growing medium in this system, so they cannot handle supporting a lot of weight from a top-heavy plant.
Nutrient Film Technique, or NFT, is a popular and versatile hydroponics system. It is similar to Ebb and Flow in that the system uses a pump to deliver fertilized water to the grow tray and a drain pipe to recycle the unused nutrient solution. The difference is that in NFT the nutrient solution is continuously flowing over the roots. This is accomplished using gravity. The grow tray is placed at an angle to allow the water to flow down towards the drainpipe, and a new solution is constantly being pumped into the high end of the tube. NFT is an active system, meaning it relies on moving parts to work. Passive systems such as Wick Systems have no moving parts.
Another important consideration is the length of your grow tray. As the nutrient solution flows over the roots, it decreases in nutrient concentration and oxygen levels. “Short-run” trays offer an advantage over long ones because they ensure that plants at the end of the line receive a nutrient solution with the same composition as those at the beginning of the line. Long channels can be used successfully, just make sure that you regularly check the nutrient levels and pH and replenish your solution. If you notice the plants at the end of the line growing more slowly or not producing as much, consider switching to a short run system.
The reservoir is placed in the grow tray, connected to the channel by a pump on the high end and a drain tube on the low end. You must also place an air stone in the reservoir, connected to an air pump outside, to oxygenate the water. Unlike other systems, the NFT does not use an automatic timer connected to the water pump because the pump runs constantly. This can be a big problem in the case of power outages, blockages or system failures, so make sure to check the pump and fill tube regularly and have a backup ready.
The nutrient solution flows in a thin film over the roots, ensuring that they are watered and fed but not completely soaked. The thin film ensures that the upper part of the roots will remain dry and have access to oxygen in the air.
Learn how to use the simple and easy Nutrient Film technique in your gravity fed hydroponics garden system with this helpful guide.
There are various ways to design a nutrient film technique system; however, all of them take after the design of a very shallow nutrient solution pouring down through the tubing. The bare roots of the plants will absorb the nutrients in the solutions when they come into contact with the water.
The roots of the plants hang down to the bottom of the channel where they come into contact with the shallow film of the nutrient solution and absorb the nutrients from them.
To enable all of the nutrient solutions to pass through the roots, growers use slightly downward tubes or channels instead of flat trays. Using tubes or channels also make it easy to set the grow tray at an angle.
Option 1 is to place seedlings directly into the holes of your PVC pipe or channel.
The reservoir joins the grow tray via a nutrient pump on the high end and the nutrient return pipe on the low end. Inside the reservoir, there is an air stone connected to an air pump outside to oxygenate the water.
The NFT system is similar to the Ebb and Flow technique for one reason: They both use water pumps to deliver the nutrients to your plants. However, unlike the flood and drain mechanics of an Ebb and Flow setup, the NFT system is a constantly flowing one.
The NFT system uses a pump to deliver water to the grow tray and a drained pipe to recycle the unused water nutrient solution.
In the NFT system, there are 2 main components: the grow tray (or channel) and the reservoir that contains water and nutrients.
There are two main components of an NFT system:
Nutrient Film Technique (NFT) is a versatile and familiar hydroponic system. Today, I'll get down to the details of this interesting soilless system.