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What (who) is hydroponics - definition
![A ''run-to-waste'' hydroponics system, referred to as "The [[Bengal]] System" after the region in eastern India where it was invented (circa 1946)](https://commons.wikimedia.org/wiki/Special:FilePath/Bengal System.png?width=200 "A ''run-to-waste'' hydroponics system, referred to as \"The [[Bengal]] System\" after the region in eastern India where it was invented (circa 1946)")
![The deep water raft tank at the Crop Diversification Centre (CDC) South [[Aquaponics]] greenhouse in [[Brooks, Alberta]]](https://commons.wikimedia.org/wiki/Special:FilePath/CDC South Aquaponics Raft Tank 1 2010-07-17.jpg?width=200 "The deep water raft tank at the Crop Diversification Centre (CDC) South [[Aquaponics]] greenhouse in [[Brooks, Alberta]]")
![The ''deep water culture'' technique being used to grow [[Hungarian wax pepper]]s](https://commons.wikimedia.org/wiki/Special:FilePath/Hungarian wax peppers roots being revealed IMG 5673.JPG?width=200 "The ''deep water culture'' technique being used to grow [[Hungarian wax pepper]]s")
![[[Expanded clay aggregate]]](https://commons.wikimedia.org/wiki/Special:FilePath/Hydroton.jpg?width=200 "[[Expanded clay aggregate]]")
![aeroponic technique]]](https://commons.wikimedia.org/wiki/Special:FilePath/Systeme AEROPONIC 573px.jpg?width=200 "aeroponic technique]]")
![[[Water plant]]-cultivated [[crocus]]](https://commons.wikimedia.org/wiki/Special:FilePath/Water-cultivate a crocus.jpg?width=200 "[[Water plant]]-cultivated [[crocus]]")
Wikipedia
Hydroponics is a type of horticulture and a subset of hydroculture which involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions. Terrestrial or aquatic plants may grow with their roots exposed to the nutritious liquid or in addition, the roots may be mechanically supported by an inert medium such as perlite, gravel, or other substrates.
Despite inert media, roots can cause changes of the rhizosphere pH and root exudates can affect rhizosphere biology and physiological balance of the nutrient solution by secondary metabolites. Transgenic plants grown hydroponically allow the release of pharmaceutical proteins as part of the root exudate into the hydroponic medium.
The nutrients used in hydroponic systems can come from many different organic or inorganic sources, including fish excrement, duck manure, purchased chemical fertilizers, or artificial nutrient solutions.
Plants are commonly grown hydroponically in a greenhouse or contained environment on inert media, adapted to the controlled-environment agriculture (CEA) process. Plants commonly grown hydroponically include tomatoes, peppers, cucumbers, strawberries, lettuces, and cannabis, usually for commercial use, and Arabidopsis thaliana, which serves as a model organism in plant science and genetics.
Hydroponics offers many advantages, notably a decrease in water usage in agriculture. To grow 1 kilogram (2.2 lb) of tomatoes using intensive farming methods requires 214 liters (47 imp gal; 57 U.S. gal) of water; using hydroponics, 70 liters (15 imp gal; 18 U.S. gal); and only 20 liters (4.4 imp gal; 5.3 U.S. gal) using aeroponics.
Hydroponic cultures lead to highest biomass and protein production compared to other growth substrates, of plants cultivated in the same environmental conditions and supplied with equal amounts of nutrients.
Since hydroponics takes much less water and nutrients to grow produce and climate change threatens agricultural yields, it could be possible in the future for people in harsh environments with little accessible water to grow their own plant-based food.
Hydroponics is not only used on Earth, but has also proven itself in plant production experiments in space.
