Dreschel, Thomas W. Bionetics Corporation, Environmental Monitoring and Research Program, Kennedy Space Center, Florida.
Last reviewed:May 2021
Show previous versions
- Hydroponic systems
- Research and applications
- Related Primary Literature
- Additional Reading
The collective techniques for supplying nutrients and water directly to the roots of plants, without soil or other media. Hydroponics is concerned with the cultivation and growing of plants without soil or other media. Hydroponic systems (Fig. 1) range in complexity from a single plant supported above an aerated jar of nutrient solution to thousands of plants supported above a large area of flowing solution in which pH, temperature, and nutrient concentrations are controlled by using a sophisticated computer system and automated chemical analyses. In hydroponic culture, the precise control of the pH and the concentrations of elements in the solution is critical; all essential elements must be provided in the correct ratios for plant growth. Elements known to be essential are nitrogen, phosphorus, potassium, calcium, magnesium, iron, manganese, boron, copper, molybdenum, and zinc. Oxygen in the root zone is also necessary. Methods that utilize an inert medium (for example, sand, gravel, peat, or vermiculite) to provide the root environment, with water and nutrients added in solution, are soilless culture, but they are not hydroponic in the strict sense. See also: Element (chemistry); pH; Plant; Plant growth; Plant mineral nutrition; Soil
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 10,000 highly qualified scientists and 46 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information