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Hydroponics

Growing plants without soil using nutrients in waterNASA researcher Ray Wheeler checking hydroponic onions (center), Bibb lettuces (left), and radishes (right)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 mineralnutrientsolutions in an artificial environment.

Plant nutritionPlant nutritionPlant nutrition is the study of the chemical elements and compounds necessary for plant growth and reproduction, plant metabolism and their external supply. In its absence the plant is unable to complete a normal life cycle, or that the element is part of some essential plant constituent or metabolite. This is in accordance with Justus von Liebig's law of the minimum.PlantPlantPlants are the eukaryotic organisms that constitute the kingdom Plantae (/'plænteɪ/). They are predominantly photosynthetic or came from photosynthetic ancestors, meaning that they obtain their energy from sunlight by using the green pigment chlorophyll in their chloroplasts to produce sugars from carbon dioxide and water. Over the course of time, some plants have evolved to be parasitic, meaning they take energy from other organisms.HorticultureHorticultureHorticulture (from Latin: + culture) is the science and art of growing ornamental plants, flowers, as well as fruits, vegetables, and other economically valuable crops or trees on a controlled scale.Solution (chemistry)Solution (chemistry)In chemistry, a solution is defined by IUPAC as "A liquid or solid phase containing more than one substance, when for convenience one (or more) substance, which is called the solvent, is treated differently from the other substances, which are called solutes. When, as is often but not necessarily the case, the sum of the mole fractions of solutes is small compared with unity, the solution is called a dilute solution."Aquatic plantAquatic plantAquatic plants, also referred to as hydrophytes, are vascular plants and non-vascular plants that have adapted to live in aquatic environments (saltwater or freshwater). In lakes, rivers and wetlands, aquatic vegetations provide cover for aquatic animals such as fish, amphibians and aquatic insects, create substrate for benthic invertebrates, produce oxygen via photosynthesis, and serve as food for some herbivorous wildlife.Terrestrial plantTerrestrial plantA terrestrial plant is a plant that grows on, in or from land. Other types of plants are aquatic (living in or on water), semiaquatic (living at edge or seasonally in water), epiphytic (living on other plants), and lithophytic (living in or on rocks). The distinction between aquatic and terrestrial plants is often blurred because many terrestrial plants are able to tolerate periodic submersion and many aquatic species have both submersed and emersed forms.SoilSoilEarth, a natural materialSurface-water-gley developed in glacial till in Northern IrelandSoil, also commonly referred to as earth, is a mixture of organic matter, minerals, gases, water, and organisms that together support the life of plants and soil organisms. Some scientific definitions distinguish dirt from soil by restricting the former term specifically to displaced soil.Medicinal plantsMedicinal plantsMedicinal plants, also called medicinal herbs, have been discovered and used in traditional medicine practices since prehistoric times. Plants synthesize hundreds of chemical compounds for various functions, including defense and protection against insects, fungi, diseases, against parasites and herbivorousmammals.PerlitePerlitePerlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral, suitable "as ceramic flux to lower the sintering temperature", and a commercial product useful for its low density after processing. It is also used as a soil conditioner in horticulture.RootRootIn vascular plants, the roots are the organs of a plant that are modified to provide anchorage for the plant and take in water and nutrients into the plant body, which allows plants to grow taller and faster. They are most often below the surface of the soil, but roots can also be aerial or aerating, that is, growing up above the ground or especially above water. FunctionRoots perform several essential and specialised roles that support plant growth, development and survival.MineralMineralCrystalline chemical element or compound formed by geologic processesCrystals of serandite, natrolite, analcime, and aegirine from Mont Saint-Hilaire, Quebec, CanadaIn geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form. The geological definition of mineral normally excludes compounds that occur only in living organisms.CropCropA crop is a plant or plant product harvested for human use. Crops are cultivated at scale to produce food, fiber, fuel, and other products. Crops have been central to human civilization since the first agricultural revolution, a key stage in the broader history of agriculture, when early societies domesticated plants for food and trade. Today, a small number of staple crops such as rice, wheat, maize, and sugarcane account for the majority of global production.

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