Drip irrigation or trickle irrigation is a type of micro-irrigation system that has the potential to save water and nutrients by allowing water to drip slowly to the roots of plants, either from above the soil surface or buried below the surface. The goal is to place water directly into the root zone and minimize evaporation. Drip irrigation systems distribute water through a network of valves, pipes, tubing, and emitters. Depending on how well designed, installed, maintained, and operated it is, a drip irrigation system can be more efficient than other types of irrigation systems, such as surface irrigation or sprinkler irrigation.


Ancient China

Primitive drip irrigation has been used since ancient times. Fan Shengzhi shu, written in China during the first century BCE, describes the use of buried, unglazed clay pots filled with water, sometimes referred to as Ollas, as a means of irrigation.[1][2]

Modern development

Germany: subsurface pipe

Modern drip irrigation began its development in Germany in 1860 when researchers began experimenting with subsurface irrigation using clay pipe to create combination irrigation and drainage systems.[3]

Perforated pipe

The research was later expanded in the 1920s to include the application of perforated pipe systems.[4]

Australia: use of plastic

The usage of plastic to hold and distribute water in drip irrigation was later developed in Australia by Hannis Thill.[4]

Israel: plastic emitter

Usage of a plastic emitter in drip irrigation was developed in Israel by Simcha Blass and his son Yeshayahu.[5] Instead of releasing water through tiny holes easily blocked by tiny particles, water was released through larger and longer passageways by using friction to slow water inside a plastic emitter. The first experimental system of this type was established in 1959 by Blass, who partnered later (1964) with Kibbutz Hatzerim to create an irrigation company called Netafim. Together they developed and patented the first practical surface drip irrigation emitter.[3][4]

Goldberg and Shmueli (1970)[6] developed a significant improvement: "in the Arava desert in southern Israel [Shmueli] demonstrated that a trickle-irrigation system installed on the soil surface worked exceptionally well in producing vegetable crops, even with saline water (Elfving, 1989). The system...was responsible for the greening of formerly unproductive environment".[7]

Replacing sub-surface system with on surface system solved the disadvantage of clogging the subsurface system. Their improvement prevailed: "Drip irrigation is presently the most efficient means to apply water to crops (Pathak et al. 2009; Goyal 2012)... There are two variations of the technology: surface and subsurface. The most common is surface drip irrigation, first developed in Israel (Goldberg and Shmueli 1970)... Due to the need to improve irrigation efficiency, as a measure toward sustainable use of water resources, there is wide interest in drip irrigation (Scanlon et al. 2012; Steward et al. 2013; Schaible and Aillery 2017) and is highlighted by numerous studies to evaluate its performance for the production of several crops."[8]

US: drip tape

In the United States, the first drip tape, called Dew Hose, was developed by Richard Chapin of Chapin Watermatics in the early 1960s.[9][10] The evolution of drip tape which made drip tape adopted and used at a big scale was the introduction of T-Tape in 1987 by Plastro Irrigation, that had the first slit outlet and a laminar flow track which later evolved into a turbulent flow regulating flow track. Chapin Watermatics was acquired by Jain Irrigation in 2006 and is housed under its US subsidiary Jain Irrigation Inc, USA.[11][12][13]

First introduced in California in the late 1960s, only 5% of irrigated land used this system by 1988. By 2010, 40% of irrigated land in California used this system.[14]

Trickle ring

A trickle ring is a circular device which evenly distributes water around the base of a tree or shrub. Connected to a water supply by a garden hose or tubing adapter fitting, trickle rings may be integrated into an irrigation network which waters many plants at the same time. By regulating the flow of water through the trickle ring, soil can be saturated at a rate which conserves water by minimizing wasteful surface runoff and losses due to evaporation.[citation needed]


Modern drip irrigation has arguably become the world's most valued innovation in agriculture since the invention in the 1930s of the impact sprinkler, which offered the first practical alternative to surface irrigation.

Current developments

Careful study of all the relevant factors like land topography, soil, water, crop and agro-climatic conditions are needed to determine the most suitable drip irrigation system and components to be used in a specific installation.

Micro-spray heads

Drip irrigation may also use devices called micro-spray heads, which spray water in a small area, instead of dripping emitters. These are generally used on tree and vine crops with wider root zones.

Subsurface drip irrigation

Subsurface drip irrigation (SDI) uses permanently or temporarily buried dripperline or drip tape located at or below the plant roots. It is becoming popular for row crop irrigation, especially in areas where water supplies are limited, or recycled water is used for irrigation.

Global reach and market leaders

As of 2012, China and India were the fastest expanding countries in the field of drip- or other micro-irrigation, while worldwide well over ten million hectares used these technologies.[15] Still, this amounted to less than 4 percent of the world's irrigated land.[15] That year, Israel's Netafim was the global market leader (a position it maintained in 2018[16]), with India's Jain Irrigation being the second-biggest micro-irrigation company.[15] In 2017 Rivulis bought Eurodrip and became the world's second largest irrigation systems manufacturer.[17]

Components and operation

Drip irrigation system layout and its parts
Water distribution in subsurface drip irrigation
Nursery flowers watered with drip irrigation in Israel
Horticulture drip emitter in a pot

Components used in drip irrigation (listed in order from water source) include:

In drip irrigation systems, pump and valves may be manually or automatically operated by a controller.

Most large drip irrigation systems employ some type of filter to prevent clogging of the small emitter flow path by small waterborne particles. New technologies are now[when?] being offered that minimize clogging. Some residential systems are installed without additional filters since potable water is already filtered at the water treatment plant. Virtually all drip irrigation equipment manufacturers recommend that filters be employed and generally will not honor warranties unless this is done. Last line filters just before the final delivery pipe are strongly recommended in addition to any other filtration system due to fine particle settlement and accidental insertion of particles in the intermediate lines.

Drip and subsurface drip irrigation is used almost exclusively when using recycled municipal wastewater. Regulations typically do not permit spraying water through the air that has not been fully treated to potable water standards.

Because of the way the water is applied in a drip system, traditional surface applications of timed-release fertilizer are sometimes ineffective, so drip systems often mix liquid fertilizer with the irrigation water. This is called fertigation; fertigation and chemigation (application of pesticides and other chemicals to periodically clean out the system, such as chlorine or sulfuric acid) use chemical injectors such as diaphragm pumps, piston pumps, or aspirators. The chemicals may be added constantly whenever the system is irrigating or at intervals. Fertilizer savings of up to 95% are being reported from recent university field tests using drip fertigation and slow water delivery as compared to timed-release and irrigation by micro spray heads.

Properly designed, installed, and managed, drip irrigation may help achieve water conservation by reducing evaporation and deep drainage when compared to other types of irrigation such as flood or overhead sprinklers since water can be more precisely applied to the plant roots. In addition, drip can eliminate many diseases that are spread through water contact with the foliage. Finally, in regions where water supplies are severely limited, there may be no actual water savings, but rather simply an increase in production while using the same amount of water as before. In very arid regions or on sandy soils, the preferred method is to apply the irrigation water as slowly as possible.

Pulsed irrigation is sometimes used to decrease the amount of water delivered to the plant at any one time, thus reducing runoff or deep percolation. Pulsed systems are typically expensive and require extensive maintenance. Therefore, the latest efforts by emitter manufacturers are focused on developing new technologies that deliver irrigation water at ultra-low flow rates, i.e. less than 1.0 L (2.1 US pints; 1.8 imperial pints) per hour. Slow-and-even delivery further improves water use efficiency without incurring the expense and complexity of pulsed delivery equipment.

An emitting pipe is a type of drip irrigation tubing with emitters pre-installed at the factory with specific distance and flow per hour as per crop distance.

An emitter restricts water flow passage through it, thus creating head loss required (to the extent of atmospheric pressure) to emit water in the form of droplets. This head loss is achieved by friction/turbulence within the emitter.

Advantages and disadvantages

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Drip irrigation and spare drip irrigation tubes in banana farm at Chinawal, India
Pot irrigation by on-line drippers
Pressure compensated integral dripper on soilless medium without growing channels

The advantages of drip irrigation are:

The disadvantages of drip irrigation are:

Drip tape

Drip Irrigation T-tape

Drip tape is a type of thin-walled dripperline used in drip irrigation. The first drip tape was known as "Dew Hose".[19]

Drip tape duct tape is made of polyethylene and is sold flat on reels. The wall thickness typically ranges from 0.1 to 0.6 mm (4 to 25 mils). Thicker walled tapes are commonly used for permanent subsurface drip irrigation and thinner walled tapes for temporary throw-away type systems in high-value crops.

Water exits from tape through emitters or drippers. The typical emitter spacing ranges from 150 to 610 mm (6 to 24 inches). In some products, the emitters are manufactured simultaneously with the tape and are actually formed as part of the product itself. In others, the emitters are manufactured separately and installed at the time of production.

Some product is not a tape, but a thin-walled dripperline, but in popular parlance, both types of products are called tapes. Typical tape diameters are 16 mm (58 in), 22 mm (78 in), and 35 mm (1+38 in), with the larger diameters more commonly used on permanent installations with longer runs.

Drip tape is a recyclable material and can be recycled into viable plastic resins for reuse in the plastics manufacturing industry.


Irrigation dripper

Drip irrigation is used in farms, commercial greenhouses, and residential gardens. Drip irrigation is adopted extensively in areas of acute water scarcity and especially for crops and trees such as coconuts, containerized landscape trees, grapes, bananas, ber, eggplant, citrus, strawberries, sugarcane, cotton, maize, and tomatoes.

Drip irrigation kits for home gardens are increasingly popular for homeowners and consist of a timer, hose, and emitter. Hoses that are 4 mm (0.16 in) in diameter are used to irrigate flower pots.

See also


  1. ^ s:zh:氾勝之書 以三斗瓦甕埋著科中央,令甕口上與地平。盛水甕中,令滿。
  2. ^ Bainbridge, David A (June 2001). "Buried clay pot irrigation: a little known but very efficient traditional method of irrigation". Agricultural Water Management. 48 (2): 79–88. doi:10.1016/S0378-3774(00)00119-0.
  3. ^ a b R. Goyal, Megh (2012). Management of drip/trickle or micro irrigation. Oakville, California: Apple Academic Press. p. 104. ISBN 978-1-926895-12-3.
  4. ^ a b c "The History of the Drip Irrigation System and What is Available Now". www.irrigation.learnabout.info.
  5. ^ "The History of Drip Irrigation".
  6. ^ Goldberg D, Shmueli, M (1970) "Drip Irrigation—A Method Used Under Arid and Desert Conditions of High Water and Soil Salinity" Transactions of the ASAE 13 (1): 0038-0041
  7. ^ Janick J, Goldman IL, (2003) "Horticulture, Horticultural Science, and 100 Years of ASHS" HortScience https://journals.ashs.org/downloadpdf/journals/hortsci/38/5/article-p883.pdf
  8. ^ Oker, Tobias E.; Kisekka, Isaya; Sheshukov, Aleksey Y.; Aguilar, Jonathan; Rogers, Danny (1 January 2020). "Evaluation of dynamic uniformity and application efficiency of mobile drip irrigation". Irrigation Science. 38 (1): 17–35. doi:10.1007/s00271-019-00648-0. ISSN 1432-1319. S2CID 253819897.
  9. ^ US 4807668, Roberts, James C., "Drip irrigation tape", published 1989-02-28 
  10. ^ US 4047995, Leal-Diaz, Jaime, "Hoses for irrigation by dripping and the like and the process to manufacture the same", published 1977-09-13 
  11. ^ "Jain Irrigation". www.JainsUSA.com. Retrieved 19 December 2017.
  12. ^ "Jain Irrigation buys Chapin for $6 mn". Business Standard India. Press Trust of India. 3 May 2006. Retrieved 30 September 2017.
  13. ^ "New AG International – Jain Irrigation Announces Acquisition of Chapin Watermatics Inc". www.newaginternational.com. Archived from the original on 30 September 2017. Retrieved 30 September 2017.
  14. ^ Zilberman, Taylor; David, Rebecca (26 July 2015). "The Diffusion of Process Innovation: The Case of Drip Irrigation in California" (PDF).
  15. ^ a b c Drip Irrigation Expanding Worldwide, National Geographic, 25 June 2012, accessed 1 August 2019
  16. ^ Tova Cohen, Israeli irrigation firm Netafim sees 50 pct earnings rise by 2020, Reuters.com, 21 March 2018, accessed 1 August 2019
  17. ^ Rivulis Irrigation buys Greek co Eurodrip, Globes, 11 January 2017
  18. ^ Yang, Chun Z.; Yaniger, Stuart I.; Jordan, V. Craig; Klein, Daniel J.; Bittner, George D. (1 July 2011). "Most Plastic Products Release Estrogenic Chemicals: A Potential Health Problem That Can Be Solved". Environmental Health Perspectives. 119 (7): 989–996. doi:10.1289/ehp.1003220. PMC 3222987. PMID 21367689.
  19. ^ "DEW-HOSE Trademark – Registration Number 0847046 – Serial Number 72249303 :: Justia Trademarks". trademarks.justia.com. Retrieved 12 June 2016.

Further reading