Coir

Natural fiber

For the Irish conservative lobby group, see Cóir.

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Look up coir in Wiktionary, the free dictionary.

A close-up view of coir fibre Segregation of coir fibre

Coir (/ˈkɔɪər/), also called coconut fibre, is a natural fibre extracted from the outer husk of coconut,[1] and used in products such as floor mats, doormats, brushes, and mattresses. Coir is the fibrous material found between the hard, internal shell and the outer coat of a coconut. Other uses of brown coir (made from ripe coconut) are in upholstery padding, sacking and horticulture. White coir, harvested from unripe coconuts, is used for making finer brushes, string, rope and fishing nets.[2][3] It has the advantage of not sinking, so can be used in long lengths in deep water without the added weight dragging down boats and buoys.

Coir must not be confused with coir pith, which is the powdery and spongy material resulting from the processing of the coir fibre.[4] Coir fibre is locally named 'coprah' in some countries, adding to confusion. Pith is chemically similar to coir, but contains much shorter fibers.[5] The name coco peat may refer either to coir or the pith or a mixture, as both have good water-retaining properties as a substitute for peat.[6]

## History

[edit]

See also: Sennit

Sennit made from plaited coconut fibre on a traditional house in Fiji

The name coir originally comes from the Tamil கயிறு (kayiru), and later the Malayalam word കയർ (kayar), for cord or rope (traditionally, a kind of rope is made from the coconut fibre).[7][8] Ropes and cordage have been made from coconut fibre since ancient times. The Austronesian peoples, who first domesticated coconuts, used coconut fibre extensively for ropes and sennit[9] in building houses and lashed-lug plank boats in their voyages in both the Pacific and the Indian Oceans.[10][11][12][13] Polynesians themselves grew a special type of coconut called the niu kafa[14] which yields a lot more fibre per fruit than types grown for human consumption (niu vai, for their water).[15]

Later Indian and Arab navigators who sailed the seas to Malaya, China, and the Persian Gulf centuries ago also used coir for their ship ropes. Arab writers of the 11th century AD referred to the extensive use of coir for ship ropes and rigging.[13][16]

A coir industry in the UK was recorded before the second half of the 19th century. During 1840, Captain Widely, in co-operation with Captain Logan and Thomas Treloar,[17] founded the known carpet firms of Treloar and Sons in Ludgate Hill, England, for the manufacture of coir into various fabrics suitable for floor coverings.[16]

## Structure

[edit]

Various forms in which coir fibre can appear

Coir fibres are found between the hard, internal shell and the outer coat of a coconut. The individual fibre cells are narrow and hollow, with thick walls made of cellulose. They are pale when immature, but later become hardened and yellowed as a layer of lignin is deposited on their walls.[18]

Each cell is about 1 mm (0.04 in) long [citation needed] and 10 to 20 μm (0.0004 to 0.0008 in) in diameter. [19] Fibres are typically 10 to 30 centimetres (4 to 12 in) long.[6] The two varieties of coir are brown and white. Brown coir harvested from fully ripened coconuts is thick, strong and has high abrasion resistance.[18] It is typically used in mats, brushes and sacking.[18] Mature brown coir fibres contain more lignin and less cellulose than fibres such as flax and cotton, so are stronger but less flexible. White coir fibres harvested from coconuts before they are ripe are white or light brown in color and are smoother and finer, but also weaker. They are generally spun to make yarn used in mats or rope.

The coir fibre is relatively waterproof, and is one of the few natural fibres resistant to damage by saltwater. Fresh water is used to process brown coir, while seawater and fresh water are both used in the production of white coir.[6]

## Processing

[edit]

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Green coconuts, harvested after about six to 12 months on the palm, contain pliable white fibres. Brown fibre is instead obtained by harvesting fully mature coconuts when the nutritious layer surrounding the seed is ready to be processed into copra and desiccated coconut. The fibrous layer of the fruit is then separated from the hard shell (manually) by driving the fruit down onto a spike to split it (dehusking). A well-seasoned husker can manually separate 2,000 coconuts per day. Machines are now available which crush the whole fruit to give the loose fibres. These machines can process up to 2,000 coconuts per hour.

### Brown fibre

[edit]

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The fibrous husks are soaked in pits or in nets in a slow-moving body of water to swell and soften the fibres.[20] The long bristle fibres are separated from the shorter mattress fibres underneath the skin of the nut, a process known as wet-milling.

The mattress fibres are sifted to remove dirt and other rubbish, dried in the sun and packed into bales. Some mattress fibre is allowed to retain more moisture so it retains its elasticity for twisted fibre production. The coir fibre is elastic enough to twist without breaking and it holds a curl as though permanently waved. Twisting is done by simply making a rope of the hank of fibre and twisting it using a machine or by hand.

The longer bristle fibre is washed in clean water and then dried before being tied into bundles or hanks. It may then be cleaned and 'hackled' by steel combs to straighten the fibres and remove any shorter fibre pieces. Coir bristle fibre can also be bleached and dyed to obtain hanks of different colours.[citation needed]

### White fibre

[edit]

The immature husks are suspended in a river or water-filled pit for up to ten months. During this time, micro-organisms break down the plant tissues surrounding the fibres to loosen them — a process known as retting.[20] The segments of the husk are then beaten with iron rods to separate out the long fibres which are subsequently dried and cleaned. Cleaned fibre is ready for spinning into yarn using a simple one-handed system or a spinning wheel.[citation needed]

In 2009, researchers at CSIR's National Institute for Interdisciplinary Science and Technology in Thiruvananthapuram developed a biological process for the extraction of coir fibre from coconut husk without polluting the environment. The technology uses enzymes to separate the fibres by converting and solubilizing plant compounds to curb the pollution of waters caused by retting of husks.[21]

### Buffering

[edit]

Because coir pith is high in sodium and potassium, it is treated before use as a growth medium for plants or fungi by soaking in a calcium buffering solution; most coir sold for growing purposes is said to be pre-treated.[22] Once any remaining salts have been leached out of the coir pith, it and the cocochips become suitable substrates for cultivating fungi. Coir is naturally rich in potassium, which can lead to magnesium and calcium deficiencies in soilless horticultural media. Coir fiber is rarely used as a potting material, except for orchids, and does not need buffering, as it has a very low cation-exchange capacity (CEC) capacity, hence not retaining salts.

Coir does provide a suitable substrate for horticultural use as a soilless potting medium. The material's high lignin content is longer-lasting, holds more water, and does not shrink off the sides of the pot when dry allowing for easier rewetting. This light media has advantages and disadvantages that can be corrected with the addition of the proper amendment such as coarse sand for weight in interior plants like Draceana. Nutritive amendments should also be considered. Calcium and magnesium will be lacking in coir potting mixes, so a naturally good source of these nutrients is dolomitic lime which contains both. pH is of utmost importance as coir pith tends to have a high pH after some months of use, resulting in plant stunting and multiple deficiencies. Coir also has the disadvantage of being extremely sensitive to the Leucocoprinus greenhouse fungus. The addition of beneficial microbes to the coir media have been successful in tropical green house conditions and interior spaces as well. The fungi engage in growth and reproduction under moist atmospheres producing fruiting bodies (mushrooms).

### Bristle coir

[edit]

Bristle coir is the longest variety of coir fibre. It is manufactured from retted coconut husks through a process called defibering. The coir fibre thus extracted is then combed using steel combs to make the fibre clean and to remove short fibres. Bristle coir fibre is used as bristles in brushes for domestic and industrial applications.

## Uses

[edit]

### Cordage, packaging, bedding, flooring, and others

[edit]

Making coir rope in Kerala, India An outrigger canoe from Sonsorol, Palau. All parts of the canoe are connected by thin coir ropes.

Red coir is used in floor mats and doormats, brushes, mattresses, floor tiles and sacking.[18] A small amount is also made into twine.[18] Pads of curled brown coir fibre, made by needle-felting (a machine technique that mats the fibres together), are shaped and cut to fill mattresses and for use in erosion control on river banks and hillsides. A major proportion of brown coir pads are sprayed with rubber latex which bonds the fibres together (rubberised coir) to be used as upholstery padding for the automobile industry in Europe. The material is also used for packaging.[18]

The major use of white coir is in rope manufacture.[18] Mats of woven coir fibre are made from the finer grades of bristle and white fibre using hand or mechanical looms. White coir also is used to make fishing nets due to its strong resistance to saltwater.[18]

### Agricultural and horticultural uses

[edit]

In agriculture and horticulture, coir is used as an organic and decorative component in soil and potting mixes. Due to the increasing concern regarding the sustainability of producing sphagnum (peat moss) and peat from peatlands, usage of alternative substrates has been on the rise; the byproduct coir is one commonly used substitute.[23] Many sources of coir however are heavily contaminated with pathogenic fungi, and the choice of the source is important. Coir is also useful to deter snails from delicate plantings, and as a growing medium in intensive glasshouse (greenhouse) horticulture.[24]

A small herb garden employing coir mixed with perlite. The soaking hose provides water and some nutrients.

Coir is used in some hydroponic growing systems as an inert substrate medium.

Coir is also used as a substrate to grow mushrooms. The coir is usually mixed with vermiculite and pasteurised with boiling water. After the coir/vermiculite mix has cooled to room temperature, it is placed in a larger container, usually a plastic box. Previously prepared spawn jars, usually grown using substrates such as rye grains or wild bird seed, are then added. This spawn is the mushroom's mycelium and will colonize the coir/vermiculite mix, eventually fruiting mushrooms.

Coir can be used as a terrarium substrate for reptiles or arachnids.[25][26]

Coir fibre pith or coir dust can hold large quantities of water, just like a sponge.[27] It is used as a replacement for traditional peat in soil mixtures, or, as a soil-less substrate for plant cultivation.[27] It has been called "coco peat" because it is to fresh coco fibre somewhat like what peat is to peat moss, although it is not true peat.

Coir waste from coir fibre industries is washed, heat-treated, screened and graded before being processed into coco peat products of various granularity and denseness, which are then used for horticultural and agricultural applications and as industrial absorbent.

Usually shipped in the form of compressed bales, briquettes, slabs or discs, the end user usually expands and aerates the compressed coco peat by the addition of water. A single kilogramme of dry coco peat will expand to 15 litres of moist coco peat.

Coco peat is used as a soil conditioner. Due to low levels of nutrients in its composition, coco peat is usually not the sole component in the medium used to grow plants. When plants are grown exclusively in coco peat, it is important to add nutrients according to the specific plants' needs. Coco peat from Philippines, Sri Lanka and India contains several macro- and micro-plant nutrients, including substantial quantities of potassium. This extra potassium can interfere with magnesium availability. Adding extra magnesium through the addition of magnesium sulphates can correct this issue.

Some coco peat is not fully decomposed when it arrives and will use up available nitrogen as it does so (known as drawdown), competing with the plant if there is not enough. This is called nitrogen robbery; it can cause nitrogen deficiency in the plants. Poorly sourced coco fibre can have excess salts in it and needs washing (check electrical conductivity of run-off water, flush if high). It holds water well and holds around 1,000 times more air than soil. Adding slow release fertilizers or organic fertilizers are highly advised when growing with coco fibre.

Common uses of coco fibre include:

* As a substitute for peat, because it is free of bacteria and most fungal spores, and is sustainably produced without the environmental damage caused by peat mining.
* Mixed with sand, compost and fertilizer to make good quality potting soil. Coco peat generally has an acidity in the range of pH - 5.5 to 6.5, which is slightly too acidic for some plants, but many popular plants can tolerate this pH range.
* As substrate for growing mushrooms, which thrive on the cellulose. Coco peat has high cellulose and lignin content.

Coco fibre can be re-used up to three times with little loss of yield. Coco fibre from diseased plants should not be re-used unless sterilization is thorough.

### Other uses

[edit]

#### Oil and fluid absorption

[edit]

Due to its superior absorption capabilities when compared to products made of clay, silica and diatomaceous earth-based absorbents, dry coconut coir pith is gaining popularity as an oil and fluid absorbent. Many other absorbents have to be mined, whereas coconut coir pith is a waste product in abundance in countries where coconut is a major agriculture product.

In the 2024 Manila Bay oil spill, the DILG Bataan appealed for hay, hair and coconut coir pith (husk) to process into oil booms as absorbent for the Philippine Coast Guard's cleanup operations.[28][29]

#### Animal bedding

[edit]

Coconut coir pith is also used as a bedding in litter boxes, animal farms and pet houses to absorb animal waste.

#### Construction material

[edit]

Coconut fiber (coir) is used as a construction material because the natural fibers are eco-friendly. Additionally, coconut fiber (CF) has low thermal conductivity, is very tough, ductile, durable, renewable and inexpensive. It was observed in an experimental study that by partially replacing 2% of cement with CF, the compressive strength of the concrete is increased.[30]

#### Biocontrol

[edit]

Trichoderma coir pith cake (TCPC) has been prepared and successfully used for control of plant diseases. The dry product TCPC has a long shelf life.[31][32][33]

## Safety

[edit]

Coir is an allergen, as well as the latex and other materials used frequently in the treatment of coir.[34]

### Biosecurity risks

[edit]

Further information: Invasive species

Coco fibre can harbor organisms that pose a threat to the biosecurity of countries into which it is imported. Coco peat has been imported into New Zealand since about 1989 with a marked increase since 2004. By 2009 a total of 25 new weed species have been found in imported coco peat. The regulations relating to importing coco peat into New Zealand have been amended to improve the biosecurity measures.[35]

On the other hand, coir can also contain beneficial life-forms. Coconut coir from Mexico has been found to contain large numbers of colonies of the beneficial fungus Aspergillus terreus, which acts as a biological control against plant pathogenic fungi.[36] Trichoderma is a naturally occurring fungus in coco peat; it works in symbiosis with plant roots to protect them from pathogenic fungi such as Pythium.[citation needed]

Coco peat may be sterilized to remove potential pathogens and weeds along with beneficial life. This may be done to remove contaminants in fresh material or to reuse old coir. Both heat (boiling or baking) and chemical means can be used.[37][38]

## Major producers

[edit]

Coir production, 2020[39] Country  | Weight (tonnes)

|

India | 586,686
Vietnam | 390,541
Sri Lanka | 161,791
Thailand | 64,098
Ghana | 39,548
All others  | 33,960
World | 1,276,624

Total world coir fibre production is 1,276,624 tonnes (1,256,462 long tons; 1,407,237 short tons). India, mainly in the coastal region of Kerala State, produces 60% of the total world supply of white coir fibre. Sri Lanka produces 36% of the total brown fibre output. Over 50% of the coir fibre produced annually throughout the world is consumed in the countries of origin, mainly India. Together, India and Sri Lanka produced 59% of the coir produced in 2020.[40] Sri Lanka remains the world's largest exporter of coir fibre and coir fibre based products.

## See also

[edit]

* Coconut production in Kerala
* Coir Board of India
* Rope
* International Coir Museum
* International Year of Natural Fibres 2009

## References

[edit]

1. ^ Chisholm, Hugh, ed. (1911). "Coir" . Encyclopædia Britannica. Vol. 6 (11th ed.). Cambridge University Press. p. 654.
2. ^ How coir is made - material, making, history, used, processing, product, industry, machine, History Archived 2006-07-14 at the Wayback Machine
3. ^ "Coco Coir - 7 Things Every Gardener Should Know". DIY Gardening. Retrieved 20 October 2023.
4. ^ "Coir Pith | Coirboard".
5. ^ Narendar, R.; Priya Dasan, K. (2014). "Chemical treatments of coir pith: Morphology, chemical composition, thermal and water retention behavior". Composites Part B: Engineering. 56: 770–779\. doi:10.1016/j.compositesb.2013.09.028.
6. ^ a b c ""How coir is made - material, making, history, used, processing, product, industry, machine, History". Archived from the original on 2006-07-14. Retrieved 2006-06-24.
7. ^ "coir | Origin and meaning of coir by Online Etymology Dictionary". www.etymonline.com. Retrieved 20 April 2018.
8. ^ "the definition of coir". Dictionary.com. Retrieved 20 April 2018.
9. ^ Baybayan, Chad (2012). "Plants and Tools Used for Building Canoes". Hawaiian Voyaging Traditions. Polynesian Voyaging Society.
10. ^ Manguin, Pierre-Yves (September 2019). "Sewn Boats of Southeast Asia: the stitched-plank and lashed-lug tradition". International Journal of Nautical Archaeology. 48 (2): 400–415\. Bibcode:2019IJNAr..48..400M. doi:10.1111/1095-9270.12367. S2CID 202363901.
11. ^ Beaujard, Philippe (August 2011). "The first migrants to Madagascar and their introduction of plants: linguistic and ethnological evidence" (PDF). Azania: Archaeological Research in Africa. 46 (2): 169–189\. doi:10.1080/0067270X.2011.580142. S2CID 55763047.
12. ^ Horridge, Adrian (2006). "The Austronesian Conquest of the Sea - Upwind". In Bellwood, Peter; Fox, James J.; Tryon, Darrell (eds.). The Austronesians: Historical and Comparative Perspectives. ANU E Press. pp. 143–160\. doi:10.22459/a.09.2006.07. ISBN 9781920942854.
13. ^ a b Lew, Christopher. "Tracing the origin of the coconut (Cocos nucifera L.)". Prized Writing 2018-2019. University of California, Davis: 143–157.
14. ^ kafa meaning sennit, as is kaha, ʻaha etc in various Polynesian languages
15. ^ Gunn, Bee F.; Baudouin, Luc; Olsen, Kenneth M. (22 June 2011). "Independent Origins of Cultivated Coconut (Cocos nucifera L.) in the Old World Tropics". PLOS ONE. 6 (6): e21143. Bibcode:2011PLoSO...621143G. doi:10.1371/journal.pone.0021143. PMC 3120816. PMID 21731660.
16. ^ a b Staff. "About Coir". Coir Board, Govt. of India. Archived from the original on 25 February 2012. Retrieved 17 March 2013.
17. ^ "Thomas Treloar 1818-1876". RootsWeb. Archived from the original on 2017-12-12.
18. ^ a b c d e f g h Materials and the Environment. 2013. doi:10.1016/c2010-0-66554-0. ISBN 9780123859716.
19. ^ "Future Fibres: Coir". Archived from the original on 2016-02-17. Retrieved 2016-01-24.
20. ^ a b "Introduction to tribology of polymer composites", Tribology of Natural Fiber Polymer Composites, Elsevier, pp. 59–83, 2008, doi:10.1533/9781845695057.59, ISBN 9781845693930, retrieved 2022-01-09
21. ^ "'Clean' technology for coir fibre extraction". The Hindu. 2009-04-30. Archived from the original on 2012-11-08.
22. ^ Hunt, Robert; Ricciardi, Zac (2011-02-10). "Reusing Media: Coco Coir". Urban Garden Magazine (14). Archived from the original on 2013-02-04.
23. ^ "New UN initiative aims to save lives and cut climate change by protecting peatlands". United Nations Sustainable Development. 17 November 2016. Retrieved 2020-07-18.
24. ^ The Complete Book on Jute & Coir Products (With Cultivation & Processing). Niir Project Consultancy Services. 27 October 2014. ISBN 978-9381039625.
25. ^ "Reptiles". 16. Fancy Publications. 2008: 66. `{{cite journal}}`: Cite journal requires `|journal=` (help)
26. ^ Jacobi, Michael (2011). Tarantulas. TFH Publications Inc. p. 93\. ISBN 9780793844784. Archived from the original on 2017-07-10.
27. ^ a b Mason, John (2003). Sustainable Agriculture. Landlinks Press. pp. 192–. ISBN 978-0-643-06876-6. Archived from the original on 10 July 2017. Retrieved 14 May 2015.
28. ^ Chavez, Chito (July 30, 2024). "Donate hair, coconut husks to contain oil spill, DILG urges public". Manila Bulletin. Retrieved July 30, 2024.
29. ^ Argosino, Faith (July 29, 2024). "PH Coast Guard battles Bataan oil spill mess with coconut husk boom". Retrieved July 29, 2024.
30. ^ Mayank (November 2019). "Effect on the Compressive strength of concrete with partial replacement of cement with coconut fibre". `{{cite journal}}`: Cite journal requires `|journal=` (help)
31. ^ Chandra Mohanan, R. (30 November 2013). "Trichoderma Coir Pith Cake - A New Product For Plant Disease Management". Indian Coconut Journal. 56 (7). Coconut Development Board. ISSN 0970-0579.
32. ^ Chandra Mohanan, R.; Peter, Prabha K.; Sharadraj, K. M. (2013). "Production technology of coir pith cake formulation of Trichoderma harzianum". Journal of Plantation Crops. 41 (2). Indian Society for Plantation Crops: 214–218\. ISSN 0304-5242.
33. ^ Peter, Prabha K.; Chandra Mohanan, R. (2013). "Evaluation of Trichoderma harzianum Rifai treatment in comparison with fungicides for the management of stem canker of cocoa caused by Phytophthora palmivora". Tropical Agriculture. 90 (4). Trinidad: University of the West Indies: 200–204\. ISSN 0041-3216.
34. ^ "Nasobronchial Allergy and Pulmonary Function Abnormalities Among Coir Workers of Alappuzha" (PDF). Japi.org. Archived (PDF) from the original on 2012-09-15.
35. ^ "Coco peat/Coir fibre". MAF Biosecurity New Zealand. 17 March 2009. Archived from the original on 3 June 2010. Retrieved 30 October 2010.
36. ^ Hyder, Naveen; Sims, James J.; Wegulo, Stephen N.. In Vitro Suppression of Soilborne Plant Pathogens by Coir. Department of Plant Pathology, University of Nebraska, 448 Plant Science Hall, Lincoln, NE 68583. 2008-11-19. URL:http://www.agrococo.com/Pathogen_Suppression.pdf Archived 2011-07-07 at the Wayback Machine. Accessed: 2009-08-17. (Archived by WebCite at)
37. ^ Photchanachai, S.; Tantharapornrerk, N.; Pola, W.; Muangkote, S.; Bayogan, E.R.V. (2018). "Coconut coir media sterilization method for growing Chinese kale microgreens". Acta Horticulturae (1210): 51–58\. doi:10.17660/ActaHortic.2018.1210.7. S2CID 139554022.
38. ^ "How to Sterilize Coco Coir". 22 July 2019.
39. ^ "Coir production in 2020, Crops/Regions/World list/Production Quantity (pick lists)". UN Food and Agriculture Organization, Corporate Statistical Database (FAOSTAT). 2022. Retrieved 10 September 2022.
40. ^ The Complete Book on Jute & Coir Products (with Cultivation & Processing).

## Further reading

[edit]

* KT Rammohan. 2008. 'Coir in India: History of Technology' in Helaine Selin (ed). Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures. Vol. 1. pp. 596–600. Berlin, Heidelberg and New York: Springer-Verlag. ISBN 978-1-4020-4559-2
* KT Rammohan and R Sundaresan. 2003. 'Socially Embedding the Commodity Chain: An Exercise in Relation to Coir Yarn Spinning in Southern India'. World Development. 31: 5. pp. 903–923.
* KT Rammohan. 1999. 'Technological Change in Kerala Industry: Lessons from Coir Yarn Spinning. Thiruvananthapuram: CDS Kerala Research Programme on Local Level Development.

## External links

[edit]

Wikimedia Commons has media related to Coconut fibres.

Look up coir in Wiktionary, the free dictionary.

* "Coir" . New International Encyclopedia. 1905.
* How to make a coir rope Video shows the whole procedure

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* Water chiller

Related concepts|

* Algaculture
* Aquaculture of coral
* Aquaculture of sea sponges
* Controlled-environment agriculture
* Historical hydroculture
* Hydroponicum
* Paludarium
* Plant nutrition
* Plant propagation
* Rhizosphere
* Root rot
* Vertical farming
* Water aeration

* Category
* Commons
* Wikibooks
* Wikiversity

Authority control databases

National|

* Germany
* United States
* Israel

Other|

* Yale LUX

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