Seaweed farming

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Underwater Eucheuma farming in the Philippines Eucheuma farming, Philippines (5211726476).jpg
Underwater Eucheuma farming in the Philippines
A seaweed farmer in Nusa Lembongan (Indonesia) gathers edible seaweed that has grown on a rope. Seaweed farming -Nusa Lembongan, Bali-16Aug2009 edit.jpg
A seaweed farmer in Nusa Lembongan (Indonesia) gathers edible seaweed that has grown on a rope.

Seaweed farming or kelp farming is the practice of cultivating and harvesting seaweed. In its simplest form farmers gather from natural beds, while at the other extreme farmers fully control the crop's life cycle.

Contents

The seven most cultivated taxa are Eucheuma spp., Kappaphycus alvarezii , Gracilaria spp., Saccharina japonica , Undaria pinnatifida , Pyropia spp., and Sargassum fusiforme . Eucheuma and K. alvarezii are attractive for carrageenan (a gelling agent); Gracilaria is farmed for agar; the rest are eaten after limited processing. [1] Seaweeds are different from mangroves and seagrasses, as they are photosynthetic algal organisms [2] and are non-flowering. [1]

The largest seaweed-producing countries as of 2022 are China (58.62%) and Indonesia (28.6%); followed by South Korea (5.09%) and the Philippines (4.19%). Other notable producers include North Korea (1.6%), Japan (1.15%), Malaysia (0.53%), Zanzibar (Tanzania, 0.5%), and Chile (0.3%). [3] [4] Seaweed farming has frequently been developed to improve economic conditions and to reduce fishing pressure. [5]

The Food and Agriculture Organization (FAO) reported that world production in 2019 was over 35 million tonnes. North America produced some 23,000 tonnes of wet seaweed. Alaska, Maine, France, and Norway each more than doubled their seaweed production since 2018. As of 2019, seaweed represented 30% of marine aquaculture. [6]

Seaweed farming is a carbon negative crop, with a high potential for climate change mitigation. [7] [8] The IPCC Special Report on the Ocean and Cryosphere in a Changing Climate recommends "further research attention" as a mitigation tactic. [9] World Wildlife Fund, Oceans 2050, and The Nature Conservancy publicly support expanded seaweed cultivation. [6]

Methods

An American kelp farmer, Bren Smith of GreenWave explains his farming methods, including the symbiotic relationship kelp has with other seafood he grows.

The earliest seaweed farming guides in the Philippines recommended the cultivation of Laminaria seaweed and reef flats at approximately one meter's depth at low tide. They also recommended cutting off seagrasses and removing sea urchins before farm construction. Seedlings are tied to monofilament lines and strung between mangrove stakes in the substrate. This off-bottom method remains a primary method. [10]

Long-line cultivation methods can be used in water approximately 7 meters (23 ft) in depth. Floating cultivation lines are anchored to the bottom and are widely used in North Sulawesi, Indonesia. [11] [12] Species cultured by long-line include those of the genera Saccharina , Undaria , Eucheuma , Kappaphycus , and Gracilaria. [13]

Cultivation in Asia is relatively low-technology with a high labor requirement. Attempts to introduce technology to cultivate detached plant growth in tanks on land to reduce labor have yet to attain commercial viability. [10]

Ecological impacts

Aerial view of seaweed farms in South Korea Seaweed Farms in South Korea (detail) (17322757055).jpg
Aerial view of seaweed farms in South Korea

Seaweed is an extractive crop that has little need for fertilisers or water, meaning that seaweed farms typically have a smaller environmental footprint than other agriculture or fed aquaculture. [14] [15] [16] Many of the impacts of seaweed farms, both positive and negative, remain understudied and uncertain. [17] [14]

Nonetheless, many environmental problems can result from seaweed farming. [17] For instance, seaweed farmers sometimes cut down mangroves to use as stakes. Removing mangroves negatively affects farming by reducing water quality and mangrove biodiversity. Farmers may remove eelgrass from their farming areas, damaging water quality. [18]

Seaweed farming can pose a biosecurity risk, as farming activities have the potential to introduce or facilitate invasive species. [19] [20] For this reason, regions such as the UK, Maine and British Columbia only allow native varieties. [21]

Farms may also have positive environmental effects. They may support welcome ecosystem services such as nutrient cycling, carbon uptake, and habitat provision.

Evidence suggests that seaweed farming can have positive impacts which include supplementing human diets, feeding livestock, creating biofuels, slowing climate change and providing crucial habitat for a marine life, but must scale sustainably in order to have these effects. [22] One way for seaweed farming to scale at terrestrial farming levels is with the use of ROVs, which can install low-cost helical anchors that can extend seaweed farming into unprotected waters. [23]

Seaweed can be used to capture, absorb, and incorporate excess nutrients into living tissue, aka nutrient bioextraction/bioharvesting, is the practice of farming and harvesting shellfish and seaweed to remove nitrogen and other nutrients from natural water bodies. [7] [24]

Similarly, seaweed farms may offer habitat that enhances biodiversity. [19] [20] Seaweed farms have been proposed to protect coral reefs [25] by increasing diversity, providing habitat for local marine species. Farming may increase the production of herbivorous fish and shellfish. [5] Pollinac reported an increase in Siginid population after the start of farming of Eucheuma seaweed in villages in North Sulawesi. [12] [17] [19] [20]

Bacterial infection ice-ice stunts seaweed crops. In the Philippines 15 percent reduction in one species appeared in 2011 to 2013, representing 268,000 tonnes of seaweed. [6]

Harvesting seaweed in North Cape (Canada) PEI harvesting seaweed.JPG
Harvesting seaweed in North Cape (Canada)

Economic impacts

In Japan the annual production of nori amounts to US$2 billion and is one of the world's most valuable aquaculture crops. The demand for seaweed production provides plentiful work opportunities.

A study conducted by the Philippines reported that plots of approximately one hectare could produce net income from Eucheuma farming was 5 to 6 times the average wage of an agriculture worker. The study also reported an increase in seaweed exports from 675 metric tons (MT) in 1967 to 13,191 MT in 1980, and 28,000 MT by 1988. [26]

About 0.7 million tonnes of carbon are removed from the sea each year by commercially harvested seaweeds. [27] In Indonesia, seaweed farms account for 40 percent of the national fisheries output and employ about one million people. [6]

The Safe Seaweed Coalition is a research and industry group that promotes seaweed cultivation. [6]

Tanzania

Seaweed farming has had widespread socio-economic impacts in Tanzania, has become a very important source of resources for women, and is the third biggest contributor of foreign currency to the country. [28] 90% of the farmers are women, and much of it is used by the skincare and cosmetics industry. [29]

In 1982 Adelaida K. Semesi began a programme of research into seaweed cultivation in Zanzibar and its application resulted in greater investment in the industry. [30]

Uses

Farmed seaweed is used in industrial products, as food, as an ingredient in animal feed, and as source material for biofuels. [31]

Chemicals

Seaweeds are used to produce chemicals that can be used for various industrial, pharmaceutical, or food products. Two major derivative products are carrageenan and agar. Bioactive ingredients can be used for industries such as pharmaceuticals, [32] industrial food, [33] and cosmetics. [34]

Carrageenan

This section is an excerpt from Carrageenan.[ edit ]
Carrageenans or carrageenins ( /ˌkærəˈɡiːnənz/ KARR-ə-GHEE-nənz; from Irish carraigín  'little rock') are a family of natural linear sulfated polysaccharides that are extracted from red edible seaweeds. Carrageenans are widely used in the food industry, for their gelling, thickening, and stabilizing properties. Their main application is in dairy and meat products, due to their strong binding to food proteins. In recent years, carrageenans have emerged as a promising candidate in tissue engineering and regenerative medicine applications as they resemble native glycosaminoglycans (GAGs). They have been mainly used for tissue engineering, wound coverage, and drug delivery. [35]

Agar

This section is an excerpt from Agar.[ edit ]
Agar ( /ˈeɪɡɑːr/ or /ˈɑːɡər/ ), or agar-agar, is a jelly-like substance consisting of polysaccharides obtained from the cell walls of some species of red algae, primarily from "ogonori" ( Gracilaria ) and "tengusa" (Gelidiaceae). [36] [37] As found in nature, agar is a mixture of two components, the linear polysaccharide agarose and a heterogeneous mixture of smaller molecules called agaropectin. [38] It forms the supporting structure in the cell walls of certain species of algae and is released on boiling. These algae are known as agarophytes, belonging to the Rhodophyta (red algae) phylum. [39] [40] The processing of food-grade agar removes the agaropectin, and the commercial product is essentially pure agarose.

Food

This section is an excerpt from Edible seaweed.[ edit ]
Edible seaweed, or sea vegetables, are seaweeds that can be eaten and used for culinary purposes. [41] They typically contain high amounts of fiber. [42] [43] They may belong to one of several groups of multicellular algae: the red algae, green algae, and brown algae. [42] Seaweeds are also harvested or cultivated for the extraction of polysaccharides [44] such as alginate, agar and carrageenan, gelatinous substances collectively known as hydrocolloids or phycocolloids. Hydrocolloids have attained commercial significance, especially in food production as food additives. [45] The food industry exploits the gelling, water-retention, emulsifying and other physical properties of these hydrocolloids. [46]

Fuel

This section is an excerpt from Algae fuel.[ edit ]
Algae fuel, algal biofuel, or algal oil is an alternative to liquid fossil fuels that uses algae as its source of energy-rich oils. Also, algae fuels are an alternative to commonly known biofuel sources, such as corn and sugarcane. [47] [48] When made from seaweed (macroalgae) it can be known as seaweed fuel or seaweed oil.

Climate change mitigation

Seaweed cultivation in the open ocean can act as a form of carbon sequestration to mitigate climate change. [49] [50] Studies have reported that nearshore seaweed forests constitute a source of blue carbon, as seaweed detritus is carried into the middle and deep ocean thereby sequestering carbon. [9] [8] [51] [52] [53] Macrocystis pyrifera (also known as giant kelp) sequesters carbon faster than any other species. It can reach 60 m (200 ft) in length and grow as rapidly as 50 cm (20 in) a day. [54] According to one study, covering 9% of the world's oceans with kelp forests could produce "sufficient biomethane to replace all of today's needs in fossil fuel energy, while removing 53 billion tons of CO2 per year from the atmosphere, restoring pre-industrial levels". [55] [56]

Seaweed farming may be an initial step towards adapting to and mitigating climate change. These include shoreline protection through the dissipation of wave energy, which is especially important to mangrove shorelines. Carbon dioxide intake would raise pH locally, benefitting calcifiers (e.g. crustaceans) or in reducing coral bleaching. Finally, seaweed farming could provide oxygen input to coastal waters, thus countering ocean deoxygenation driven by rising ocean temperature. [8] [57]

Tim Flannery claimed that growing seaweeds in the open ocean, facilitated by artificial upwelling and substrate, can enable carbon sequestration if seaweeds are sunk to depths greater than one kilometer. [58] [59] [60]

Seaweed contributes approximately 16–18.7% of the total marine-vegetation sink. In 2010 there were 19.2 × tons of aquatic plants worldwide, 6.8 × tons for brown seaweeds; 9.0 × tons for red seaweeds; 0.2 × tons of green seaweeds; and 3.2 × tons of miscellaneous aquatic plants. Seaweed is largely transported from coastal areas to the open and deep ocean, acting as a permanent storage of carbon biomass within marine sediments. [61]

Ocean afforestation is a proposal for farming seaweed for carbon removal. [49] [62] After harvesting seaweed is decomposed into biogas (60% methane and 40% carbon dioxide) in an anaerobic digester. The methane can be used as a biofuel, while the carbon dioxide can be stored to keep it from the atmosphere. [56]

Marine permaculture

Similarly, the NGO Climate Foundation and permaculture experts claimed that offshore seaweed ecosystems can be cultivated according to permaculture principles, constituting marine permaculture. [63] [64] [65] [66] [67] The concept envisions using artificial upwelling and floating, submerged platforms as substrate to replicate natural seaweed ecosystems that provide habitat and the basis of a trophic pyramid for marine life. [68] Seaweeds and fish can be sustainably harvested. As of 2020, successful trials had taken place in Hawaii, the Philippines, Puerto Rico and Tasmania. [69] [70] The idea featured as a solution covered by the documentary 2040 and in the book Drawdown: The Most Comprehensive Plan Ever Proposed to Reverse Global Warming.

History

Bundles of brush in the Tama River estuary used for growing Porphyra algae in Japan, c. 1921 FMIB 53548 On cueillie l'Asaksanori dans la plantation (Sudate) de Daisikaware dans la hail de la riviere Tamagawa.jpeg
Bundles of brush in the Tama River estuary used for growing Porphyra algae in Japan, c. 1921

Human use of seaweed is known from the Neolithic period. [4] Cultivation of gim (laver) in Korea is reported in books from the 15th century. [71] [72] Seaweed farming began in Japan as early as 1670 in Tokyo Bay. [73] In autumn of each year, farmers would throw bamboo branches into shallow, muddy water, where the spores of the seaweed would collect. A few weeks later these branches would be moved to a river estuary. Nutrients from the river helped the seaweed to grow. [73]

Eucheuma farming in the Philippines Eucheuma farming, Philippines (5211726822).jpg
Eucheuma farming in the Philippines

In the 1940s, the Japanese improved this method by placing nets of synthetic material tied to bamboo poles. This effectively doubled production. [73] A cheaper variant of this method is called the hibi method—ropes stretched between bamboo poles. In the early 1970s, demand for seaweed and seaweed products outstripped supply, and cultivation was viewed as the best means to increase production. [74]

In the tropics, commercial cultivation of Caulerpa lentillifera (sea grapes) was pioneered in the 1950s in Cebu, Philippines, after accidental introduction of C. lentillifera to fish ponds on the island of Mactan. [75] [76] This was further developed by local research, particularly through the efforts of Gavino Trono, since recognized as a National Scientist of the Philippines. Local research and experimental cultures led to the development of the first commercial farming methods for other warm-water algae (since cold-water red and brown edible algae favored in East Asia do not grow in the tropics), including the first successful commercial cultivation of carrageenan-producing algae. These include Eucheuma spp., Kappaphycus alvarezii , Gracilaria spp., and Halymenia durvillei. [77] [78] [79] [80] In 1997, it was estimated that 40,000 people in the Philippines made their living through seaweed farming. [25] The Philippines was the world's largest producer of carrageenan for several decades until it was overtaken by Indonesia in 2008. [81] [82] [83] [84]

Seaweed farming spread beyond Japan and the Philippines to southeast Asia, Canada, Great Britain, Spain, and the United States. [85]

In the 2000s, seaweed farming has been getting increasing attention due to its potential for mitigating both climate change and other environmental issues, such as agricultural runoff. [86] [87] Seaweed farming can be mixed with other aquaculture, such as shellfish, to improve water bodies, such as in the practices developed by American non-profit GreenWave. [86] The IPCC Special Report on the Ocean and Cryosphere in a Changing Climate recommends "further research attention" as a mitigation tactic. [9]

See also

Related Research Articles

<span class="mw-page-title-main">Algae</span> Diverse group of photosynthetic eukaryotic organisms

Algae are any of a large and diverse group of photosynthetic, eukaryotic organisms. The name is an informal term for a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular microalgae, such as Chlorella, Prototheca and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to 50 metres (160 ft) in length. Most are aquatic and lack many of the distinct cell and tissue types, such as stomata, xylem and phloem that are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae which includes, for example, Spirogyra and stoneworts. Algae that are carried by water are plankton, specifically phytoplankton.

<span class="mw-page-title-main">Aquaculture</span> Farming of aquatic organisms

Aquaculture, also known as aquafarming, is the controlled cultivation ("farming") of aquatic organisms such as fish, crustaceans, mollusks, algae and other organisms of value such as aquatic plants. Aquaculture involves cultivating freshwater, brackish water and saltwater populations under controlled or semi-natural conditions, and can be contrasted with commercial fishing, which is the harvesting of wild fish. Aquaculture is also a practice used for restoring and rehabilitating marine and freshwater ecosystems. Mariculture, commonly known as marine farming, is aquaculture in seawater habitats and lagoons, as opposed to freshwater aquaculture. Pisciculture is a type of aquaculture that consists of fish farming to obtain fish products as food.

<span class="mw-page-title-main">Agar</span> Thickening agent used in microbiology and food

Agar, or agar-agar, is a jelly-like substance consisting of polysaccharides obtained from the cell walls of some species of red algae, primarily from "ogonori" (Gracilaria) and "tengusa" (Gelidiaceae). As found in nature, agar is a mixture of two components, the linear polysaccharide agarose and a heterogeneous mixture of smaller molecules called agaropectin. It forms the supporting structure in the cell walls of certain species of algae and is released on boiling. These algae are known as agarophytes, belonging to the Rhodophyta phylum. The processing of food-grade agar removes the agaropectin, and the commercial product is essentially pure agarose.

<span class="mw-page-title-main">Mariculture</span> Cultivation of marine organisms in the open ocean

Mariculture, sometimes called marine farming or marine aquaculture, is a specialized branch of aquaculture involving the cultivation of marine organisms for food and other animal products, in enclosed sections of the open ocean, fish farms built on littoral waters, or in artificial tanks, ponds or raceways which are filled with seawater. An example of the latter is the farming of marine fish, including finfish and shellfish like prawns, or oysters and seaweed in saltwater ponds. Non-food products produced by mariculture include: fish meal, nutrient agar, jewellery, and cosmetics.

<span class="mw-page-title-main">Carrageenan</span> Natural linear sulfated polysaccharide

Carrageenans or carrageenins are a family of natural linear sulfated polysaccharides that are extracted from red edible seaweeds. Carrageenans are widely used in the food industry, for their gelling, thickening, and stabilizing properties. Their main application is in dairy and meat products, due to their strong binding to food proteins. In recent years, carrageenans have emerged as a promising candidate in tissue engineering and regenerative medicine applications as they resemble native glycosaminoglycans (GAGs). They have been mainly used for tissue engineering, wound coverage, and drug delivery.

<span class="mw-page-title-main">Algaculture</span> Aquaculture involving the farming of algae

Algaculture is a form of aquaculture involving the farming of species of algae.

<span class="mw-page-title-main">Integrated multi-trophic aquaculture</span> Type of aquaculture

Integrated multi-trophic aquaculture (IMTA) provides the byproducts, including waste, from one aquatic species as inputs for another. Farmers combine fed aquaculture with inorganic extractive and organic extractive aquaculture to create balanced systems for environment remediation (biomitigation), economic stability and social acceptability.

<i>Gelidium</i> Genus of algae

Gelidium is a genus of thalloid red algae comprising 134 species. Its members are known by a number of common names.

<i>Kappaphycus alvarezii</i> Species of red algae

Kappaphycus alvarezii, the elkhorn sea moss, is a species of red algae. The elkhorn sea moss varies in size, weight, and age. It is a dark greenish-brown hue and can sometimes be deep purple. The moss is cylindrical in shape throughout the seaweed. Its diameter averages 1.526 mm when dried. Near the base of the seaweed, its average length is from 1 mm to 17 mm and 1 mm to 2 mm in diameter. Firm algae are around 2 m tall, with axes and branches around 1–2 cm in diameter. It used to be believed they reproduced through vegetative fermentation, but recent studies show that they reproduce sexually. They reproduce through vegetative propagation and reproduce sexually. Cross sections of the Elkhorn sea moss have a medulla composed of small thick-walled cells interspaced among large parenchyma cells. This moss is used for various types of foods that humans consume and can also be used to make a jelly-like dessert. This moss is a very good source of minerals and of high commercial interest. It is one of the most important commercial sources of carrageenans, a family of gel-forming, viscosifying polysaccharides. Farming methods affect the character of the carrageenan that can be extracted from the seaweed. It is very fast-growing, known to double its biomass in 15 days.

<i>Gulaman</i> Dried agar used to make jelly-like desserts in Filipino cuisine

Gulaman, in Filipino cuisine, is a bar, or powdered form, of dried agar or carrageenan extracted from edible seaweed used to make jelly-like desserts. In common usage, it also usually refers to the refreshment sago't gulaman, sometimes referred to as samalamig, sold at roadside stalls and vendors.

<span class="mw-page-title-main">Seaweed</span> Macroscopic marine algae

Seaweed, or macroalgae, refers to thousands of species of macroscopic, multicellular, marine algae. The term includes some types of Rhodophyta (red), Phaeophyta (brown) and Chlorophyta (green) macroalgae. Seaweed species such as kelps provide essential nursery habitat for fisheries and other marine species and thus protect food sources; other species, such as planktonic algae, play a vital role in capturing carbon and producing at least 50% of Earth's oxygen.

<span class="mw-page-title-main">Edible seaweed</span> Algae that can be eaten and used for culinary purposes

Edible seaweed, or sea vegetables, are seaweeds that can be eaten and used for culinary purposes. They typically contain high amounts of fiber. They may belong to one of several groups of multicellular algae: the red algae, green algae, and brown algae. Seaweeds are also harvested or cultivated for the extraction of polysaccharides such as alginate, agar and carrageenan, gelatinous substances collectively known as hydrocolloids or phycocolloids. Hydrocolloids have attained commercial significance, especially in food production as food additives. The food industry exploits the gelling, water-retention, emulsifying and other physical properties of these hydrocolloids.

<span class="mw-page-title-main">Ice-ice</span> Disease condition of seaweed

Ice-ice is a disease condition of seaweed. Ice-ice is caused when changes in salinity, ocean temperature and light intensity cause stress to seaweeds, making them produce a "moist organic substance" that attracts bacteria in the water and induces the characteristic "whitening" and hardening of the seaweed's tissues. Bacteria involved include those in the Vibrio-Aeromonas and Cytophaga-Flavobacteria complexes. The bacteria lyse epidermal cells and chloroplasts, turning the seaweed tissue white. The disease is known from seaweeds including Kappaphycus alvarezii and Eucheuma denticulatum, economically important sources of carrageenan. In countries where seaweed is harvested as a crop, ice-ice can wreak havoc on yields. Zamboanga, Philippines, had an outbreak of ice-ice in 2004, and Bali, Indonesia, experienced an outbreak in 2009. A rise in surface sea temperatures of 2–3 degrees Celsius can trigger ice-ice outbreaks.

<i>Eucheuma</i> Genus of algae

Eucheuma, commonly known as sea moss or gusô, is a rhodophyte seaweed that may vary in color. Eucheuma species are used in the production of carrageenan, an ingredient for cosmetics, food processing, and industrial manufacturing, as well as a food source for people in the Philippines, Caribbean and parts of Indonesia and Malaysia. Eucheuma cottonii – which grows in the Caribbean and cultivated in the Philippines – is the particular species known as gusô. Other species include Betaphycus gelatinae, Eucheuma denticulatum, and several species of the genus Kappaphycus, including K. alvarezii. Since the mid-1970s, Kappaphycus and Eucheuma have been a major source for the expansion of the carrageenan industry.

<span class="mw-page-title-main">Aquaculture of giant kelp</span> Cultivation of seaweed

Aquaculture of giant kelp, Macrocystis pyrifera, is the cultivation of kelp for uses such as food, dietary supplements or potash. Giant kelp contains iodine, potassium, other minerals vitamins and carbohydrates.

<i>Eucheuma denticulatum</i> Species of alga

Eucheuma denticulatum is a species of red algae and one of the primary sources of iota carrageenan. It exists naturally in the Philippines, tropical Asia, and the western Pacific, but for the commercial extraction of carrageenan it is usually cultivated. The species is commonly known as E. spinosum when cultivated and can be found in different colours: brown, green and red.

<span class="mw-page-title-main">Gavino Trono</span> Filipino biologist (born 1931)

Gavino Trono Jr. is a Filipino marine biologist dubbed as the "Father of Kappaphycus farming". He was conferred the rank of National Scientist of the Philippines for contributions to the study of tropical marine phycology, focusing on seaweed biodiversity. He is currently a professor emeritus of the University of the Philippines Marine Science Institute.

<span class="mw-page-title-main">Marine permaculture</span>

Marine Permaculture is a form of mariculture that reflects the principles of permaculture by recreating seaweed forest habitat and other ecosystems in nearshore and offshore ocean environments. Doing so enables a sustainable long-term harvest of seaweeds and seafood, while regenerating life in the ocean.

<span class="mw-page-title-main">Flower Msuya</span> Tanzanian scientist

Flower Ezekiel Msuya is a Tanzanian phycologist. She specialises in algaculture and integrated aquaculture.

Seaweed fertiliser is organic fertilizer made from seaweed that is used in agriculture to increase soil fertility and plant growth. The use of seaweed fertilizer dates back to antiquity and has a broad array of benefits for soils. Seaweed fertilizer can be applied in a number of different forms, including refined liquid extracts and dried, pulverized organic material. Through its composition of various bioactive molecules, seaweed functions as a strong soil conditioner, bio-remediator, and biological pest control, with each seaweed phylum offering various benefits to soil and crop health. These benefits can include increased tolerance to abiotic stressors, improved soil texture and water retention, and reduced occurrence of diseases.

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Sources

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