Unlike passive systems of hydroponics, in one way or another, there is a mechanical effect on the nutrient solution from the injection devices, namely, pumps and pumps. Due to the forced circulation and aeration of the solution supplied to the roots of the plant, nutrients are better absorbed, providing the plant with everything necessary. This gives active hydroponic systems a huge advantage over passive ones, though until suddenly the power is cut off or the pump breaks down. But the installation of an emergency power source (for example, a computer UPS) and the use of a substrate capable of retaining moisture (for example, coconut coir) will solve such problems once or twice or three. There are five main types of active systems, and each deserves attention to consideration:
- The system of periodic flooding in hydroponics, also known as tide-ebb technology, is one of the simplest hydroponic active systems. Excellent oxygenates the root system. However, it requires careful selection of the irrigation cycle and is limited in size.
- The nutrient layer method in hydroponics (NFT) is good because, if desired, the system for it can be assembled from improvised means. A large area of air contact with water is a distinctive feature of this technology. The system does not require large investments and is great for rooting cuttings.
- The technique of deep flow in hydroponics (DFT, Deep Flow Technique) is a special case of the nutrient layer method. This hydroponic system works in a closed loop and in some moments exceeds the NFT technique. It does not enjoy great popularity due to a number of drawbacks.
- Drip systems in hydroponics (Drip systems) are excellent for greenhouse and crop production on an industrial scale. Their development was the introduction of mineral wool as a hydroponic substrate. The drip irrigation method is a good option for beginners.
- Aero-hydroponic systems do not harm the environment so that large enterprises are increasingly replacing them with other plant growing technologies. These systems are characterized by the use of air and water pumps, as well as whirlpool systems.
The choice in favor of a particular method depends on a variety of factors, including financial capabilities and the tasks assigned to it. Each system has its advantages and disadvantages, but they all have the right to exist.