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Slash-and-burn agriculture is a farming method that involves the cutting and burning of plants in a
forest A forest is an area of land dominated by trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United Nations' ...
or
woodland A woodland () is, in the broad sense, land covered with trees, or in a narrow sense, synonymous with wood (or in the U.S., the ''plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunlight and limited shade (see ...
to create a
field Field may refer to: Expanses of open ground * Field (agriculture), an area of land used for agricultural purposes * Airfield, an aerodrome that lacks the infrastructure of an airport * Battlefield * Lawn, an area of mowed grass * Meadow, a grass ...
called a swidden. The method begins by cutting down the trees and woody plants in an area. The downed
vegetation Vegetation is an assemblage of plant species and the ground cover they provide. It is a general term, without specific reference to particular taxa, life forms, structure, spatial extent, or any other specific botanical or geographic character ...
, or "slash", is then left to dry, usually right before the rainiest part of the year. Then, the
biomass Biomass is plant-based material used as a fuel for heat or electricity production. It can be in the form of wood, wood residues, energy crops, agricultural residues, and waste from industry, farms, and households. Some people use the terms bi ...
is burned, resulting in a nutrient-rich layer of ash which makes the soil fertile, as well as temporarily eliminating
weed A weed is a plant considered undesirable in a particular situation, "a plant in the wrong place", or a plant growing where it is not wanted.Harlan, J. R., & deWet, J. M. (1965). Some thoughts about weeds. ''Economic botany'', ''19''(1), 16-24. ...
and
pest species A pest is any animal or plant harmful to humans or human concerns. The term is particularly used for creatures that damage crops, livestock, and forestry or cause a nuisance to people, especially in their homes. Humans have modified the environ ...
. After about three to five years, the plot's
productivity Productivity is the efficiency of production of goods or services expressed by some measure. Measurements of productivity are often expressed as a ratio of an aggregate output to a single input or an aggregate input used in a production proces ...
decreases due to depletion of nutrients along with weed and pest invasion, causing the farmers to abandon the field and move to a new area. The time it takes for a swidden to recover depends on the location and can be as little as five years to more than twenty years, after which the plot can be slashed and burned again, repeating the cycle. In
Bangladesh Bangladesh (}, ), officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 165 million people in an area of . Bangladesh is among the mos ...
and
India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...
, the practice is known as
jhum The traditional shifting cultivation farming technique of indigenous communities and Bengalis in the Chittagong Hill Tracts in Bangladesh and nearby regions in Arunachal Pradesh, Mizoram, and Nagaland in India is known as jhum cultivation. Tec ...
or jhoom. Slash-and-burn is a type of
shifting cultivation Shifting cultivation is an agricultural system in which plots of land are cultivated temporarily, then abandoned while post-disturbance fallow vegetation is allowed to freely grow while the cultivator moves on to another plot. The period of cul ...
, an
agricultural Agriculture or farming is the practice of cultivating Plant, plants and livestock. Agriculture was the key development in the rise of Sedentism, sedentary human civilization, whereby farming of Domestication, domesticated species created food ...
system in which farmers routinely move from one cultivable area to another. A rough estimate is that 200 million to 500 million people worldwide use slash-and-burn. Slash-and-burn causes temporary
deforestation Deforestation or forest clearance is the removal of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated d ...
. Ashes from the burnt trees help farmers by providing nutrients for the soil. In low density of human population this approach is very sustainable but the technique is not scalable for large human populations. A similar term is
assarting Assarting is the act of clearing forested lands for use in agriculture or other purposes. In English land law, it was illegal to assart any part of a royal forest without permission. This was the greatest trespass that could be committed in a ...
, which is the clearing of forests, usually (but not always) for the purpose of agriculture. Assarting does not include burning.


History

Historically, slash-and-burn cultivation has been practiced throughout much of the world. Fire was already used by hunter-gatherers before the invention of agriculture, and still is in present times. Clearings created by the fire were made for many reasons, such as to provide new growth for game animals and to promote certain kinds of edible plants. During the
Neolithic Revolution The Neolithic Revolution, or the (First) Agricultural Revolution, was the wide-scale transition of many human cultures during the Neolithic period from a lifestyle of hunting and gathering to one of agriculture and settlement, making an incre ...
, groups of
hunter-gatherers A traditional hunter-gatherer or forager is a human living an ancestrally derived lifestyle in which most or all food is obtained by foraging, that is, by gathering food from local sources, especially edible wild plants but also insects, fungi, ...
domesticated various plants and animals, permitting them to settle down and practice agriculture, which provided more nutrition per hectare than hunting and gathering. Some groups could easily plant their crops in open fields along river valleys, but others had forests covering their land. Thus, since Neolithic times, slash-and-burn agriculture has been widely used to clear land to make it suitable for crops and livestock. Large groups wandering in the woodlands was once a common form of society in European
prehistory Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of ...
. The extended family burned and cultivated their swidden plots, sowed one or more crops, and then proceeded on to the next plot.


Technique

Slash-and-burn fields are typically used and owned by a family until the soil is exhausted. At this point the ownership rights are abandoned, the family clears a new field, and trees and shrubs are permitted to grow on the former field. After a few decades, another family or clan may then use the land and claim usufructuary rights. In such a system there is typically no market in farmland, so land is not bought or sold on the open market and land rights are traditional. In slash-and-burn agriculture, forests are typically cut months before a dry season. The "slash" is permitted to dry and then burned in the following dry season. The resulting ash fertilizes the soil and the burned field is then planted at the beginning of the next rainy season with crops such as rice, maize, cassava, or other staples. This work was once done using simple tools such as
machete Older machete from Latin America Gerber machete/saw combo Agustín Cruz Tinoco of San Agustín de las Juntas, Oaxaca">San_Agustín_de_las_Juntas.html" ;"title="Agustín Cruz Tinoco of San Agustín de las Juntas">Agustín Cruz Tinoco of San ...
s,
axe An axe ( sometimes ax in American English; see spelling differences) is an implement that has been used for millennia to shape, split and cut wood, to harvest timber, as a weapon, and as a ceremonial or heraldic symbol. The axe has ma ...
s, hoes and
shovel A shovel is a tool used for digging, lifting, and moving bulk materials, such as soil, coal, gravel, snow, sand, or ore. Most shovels are hand tools consisting of a broad blade fixed to a medium-length handle. Shovel blades are usually made of ...
s.


Benefits and drawbacks

This system of agriculture provides millions of people with food and income. It has been ecologically sustainable for thousands of years. Because the leached soil in many tropical regions, such as the Amazon, are nutritionally extremely poor, slash-and-burn is one of the only types of agriculture which can be practiced in these areas. Slash-and-burn farmers typically plant a variety of crops, instead of a monoculture, and contribute to a higher biodiversity due to creating mosaic habitats. The general ecosystem is not harmed in traditional slash-and-burn, aside from a small temporary patch. Slash and burn agriculture may be thought of as a form of
agroforestry Agroforestry is a land use management system in which trees or shrubs are grown around or among crops or pastureland. Trees produce a wide range of useful and marketable products from fruits/nuts, medicines, wood products, etc. This intentional ...
. This technique is most unsuitable for the production of cash crops. A huge amount of land, or a low density of people, is required for slash-and-burn. When slash-and-burn is practiced in the same area too often, because the human population density has increased to an unsustainable level, the forest will eventually be destroyed.


Regionally


South Asia

Tribal groups in the northeastern Indian states of
Tripura Tripura (, Bengali: ) is a state in Northeast India. The third-smallest state in the country, it covers ; and the seventh-least populous state with a population of 36.71 lakh ( 3.67 million). It is bordered by Assam and Mizoram to the east a ...
,
Arunachal Pradesh Arunachal Pradesh (, ) is a state in Northeastern India. It was formed from the erstwhile North-East Frontier Agency (NEFA) region, and became a state on 20 February 1987. It borders the states of Assam and Nagaland to the south. It shares int ...
,
Meghalaya Meghalaya (, or , meaning "abode of clouds"; from Sanskrit , "cloud" + , "abode") is a states and union territories of India, state in northeastern India. Meghalaya was formed on 21 January 1972 by carving out two districts from the state of As ...
,
Mizoram Mizoram () is a state in Northeast India, with Aizawl as its seat of government and capital city. The name of the state is derived from "Mizo people, Mizo", the endonym, self-described name of the native inhabitants, and "Ram", which in the Mizo ...
and
Nagaland Nagaland () is a landlocked state in the northeastern region of India. It is bordered by the Indian states of Arunachal Pradesh to the north, Assam to the west, Manipur to the south and the Sagaing Region of Myanmar to the east. Its capital cit ...
and the
Bangladesh Bangladesh (}, ), officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 165 million people in an area of . Bangladesh is among the mos ...
i districts of
Rangamati Rangamati (Bengali: রাঙ্গামাটি;) is the administrative headquarter and town of Rangamati Hill District in the Chittagong Hill Tracts of Bangladesh. The town is located at 22°37'60N 92°12'0E and has an altitude of . The distr ...
,
Khagrachari Khagrachari ( bn, খাগড়াছড়ি) is a district in the Chittagong Division of Southeastern Bangladesh. It is a part of the Chittagong Hill Tracts region. History The Chittagong Hill Tracts was under the reign of the Tripura Sta ...
,
Bandarban Bandarban ( bn, বান্দরবান, Chakma: 𑄝𑄚𑄴𑄘𑄧𑄢𑄴𑄝𑄚𑄴) is a district in South-Eastern Bangladesh, and a part of the Chittagong Division. It is one of the three hill districts of Bangladesh and a part of ...
and
Sylhet Sylhet ( bn, সিলেট) is a metropolitan city in northeastern Bangladesh. It is the administrative seat of the Sylhet Division. Located on the north bank of the Surma River at the eastern tip of Bengal, Sylhet has a subtropical climate an ...
refer to slash-and-burn agriculture as ''jhum'' or ''jhoom'' cultivation. The system involves clearing land, by fire or clear-felling, for economically-important crops such as
upland rice Upland rice is a type of rice grown on dry soil rather than flooded paddy field, rice paddies. It is sometimes also called dry rice. Introduction Today nearly 100 million people depend on upland rice as their daily staple food. Almost two-thi ...
, vegetables or fruits. After a few cycles, the land's fertility declines and a new area is chosen. ''Jhum'' cultivation is most often practiced on the slopes of thickly-forested hills. Cultivators cut the treetops to allow sunlight to reach the land, burning the trees and grasses for fresh soil. Although it is believed that this helps fertilize the land, it can leave it vulnerable to
erosion Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is distin ...
. Holes are made for the seeds of crops such as
sticky rice Glutinous rice (''Oryza sativa var. glutinosa''; also called sticky rice, sweet rice or waxy rice) is a type of rice grown mainly in Southeast and East Asia, and the northeastern regions of South Asia, which has opaque grains, very low amylose ...
, maize, eggplant and cucumber. After considering ''jhum''s effects, the government of
Mizoram Mizoram () is a state in Northeast India, with Aizawl as its seat of government and capital city. The name of the state is derived from "Mizo people, Mizo", the endonym, self-described name of the native inhabitants, and "Ram", which in the Mizo ...
has introduced a policy to end the method in the state.


Americas

Some American civilizations, like the Maya, have used slash-and-burn cultivation since ancient times.
Native Americans in the United States Native Americans, also known as American Indians, First Americans, Indigenous Americans, and other terms, are the Indigenous peoples of the mainland United States ( Indigenous peoples of Hawaii, Alaska and territories of the United State ...
also used fire in agriculture and hunting. In the Amazon, many peoples such as the
Yanomami The Yanomami, also spelled Yąnomamö or Yanomama, are a group of approximately 35,000 indigenous people who live in some 200–250 villages in the Amazon rainforest on the border between Venezuela and Brazil. Etymology The ethnonym ''Yanomami ...
also live off the slash and burn method due to the Amazon's poor soil quality.


Northern Europe

Slash-and-burn techniques were used in northeastern Sweden in agricultural systems. In Sweden the practice is known as . Telkkämäki Nature Reserve in
Kaavi Kaavi is a municipality of Finland. It is located in the Northern Savonia region. Kaavi is also a part of historical Karelia. The municipality has a population of () and covers an area of of which is water. The population density is . It is fr ...
, Finland, is an
open-air museum An open-air museum (or open air museum) is a museum that exhibits collections of buildings and artifacts out-of-doors. It is also frequently known as a museum of buildings or a folk museum. Definition Open air is “the unconfined atmosphere ...
where slash-and-burn agriculture is demonstrated. Farm visitors can see how people farmed when slash-and-burn was the norm in the
Northern Savonia North Savo (or Northern Savonia; fi, Pohjois-Savo; sv, Norra Savolax) is a region in eastern Finland. It borders the regions of South Savo, Central Finland, North Ostrobothnia, Kainuu, and North Karelia. Kuopio is the largest city in the regi ...
n region of eastern Finland beginning in the 15th century. Areas of the reserve are burnt each year.


is a
Swedish Swedish or ' may refer to: Anything from or related to Sweden, a country in Northern Europe. Or, specifically: * Swedish language, a North Germanic language spoken primarily in Sweden and Finland ** Swedish alphabet, the official alphabet used by ...
and
Norwegian Norwegian, Norwayan, or Norsk may refer to: *Something of, from, or related to Norway, a country in northwestern Europe * Norwegians, both a nation and an ethnic group native to Norway * Demographics of Norway *The Norwegian language, including ...
term for
slash-and-burn agriculture Slash-and-burn agriculture is a farming method that involves the cutting and burning of plants in a forest or woodland to create a field called a swidden. The method begins by cutting down the trees and woody plants in an area. The downed veget ...
derived from the
Old Norse Old Norse, Old Nordic, or Old Scandinavian, is a stage of development of North Germanic languages, North Germanic dialects before their final divergence into separate Nordic languages. Old Norse was spoken by inhabitants of Scandinavia and t ...
word , which means "to burn". This practice originated in Russia in the region of
Novgorod Veliky Novgorod ( rus, links=no, Великий Новгород, t=Great Newtown, p=vʲɪˈlʲikʲɪj ˈnovɡərət), also known as just Novgorod (), is the largest city and administrative centre of Novgorod Oblast, Russia. It is one of the ol ...
and was widespread in Finland and Eastern Sweden during the Medieval period. It spread to western Sweden in the 16th Century when Finnish settlers were encouraged to migrate there by King
Gustav Vasa Gustav I, born Gustav Eriksson of the Vasa noble family and later known as Gustav Vasa (12 May 1496 – 29 September 1560), was King of Sweden from 1523 until his death in 1560, previously self-recognised Protector of the Realm ('' Riksföre ...
to help clear the dense forests. Later, when the Finns were persecuted by the local Swedes, farming was spread by refugees to eastern
Norway Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and t ...
, more specfically in the eastern part of
Solør Solør is a Norwegian traditional district consisting of the valley between Elverum in the north and Kongsvinger in the south. It is part of Innlandet county and it includes the municipalities Våler, Åsnes, and Grue. Glomma valley Glommadal ...
, in the area bordering Sweden known as
Finnskogen Finnskogen ("Forest of the Finns") is an area of Norway and Sweden situated in the counties of Innlandet and Värmland respectively, so named because of immigration of Finnish people in the 17th century, the so-called '' Skogfinner/"Forest Finns"''. ...
("the Finnish woods"). The practice also spread to
New Sweden New Sweden ( sv, Nya Sverige) was a Swedish colony along the lower reaches of the Delaware River in what is now the United States from 1638 to 1655, established during the Thirty Years' War when Sweden was a great military power. New Sweden form ...
in North America. Reinforced by the use of fire in agriculture and hunting by Native Americans, it became an important part of pioneering in America.


Description of process

involved stripping a ring of bark completely around the trunk of
coniferous trees Conifers are a group of cone-bearing seed plants, a subset of gymnosperms. Scientifically, they make up the division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single extant class, Pinopsida. All extant ...
like
pine A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accep ...
or
spruce A spruce is a tree of the genus ''Picea'' (), a genus of about 35 species of coniferous evergreen trees in the family Pinaceae, found in the northern temperate and boreal (taiga) regions of the Earth. ''Picea'' is the sole genus in the subfami ...
or felling them, allowing them to dry, setting fire to the dried forest and growing crops on the fertile ash-covered soil. The resulting ash was highly fertile, but only for a short period. The clearing was initially planted to rye as soon as the ash had fully settled and sufficiently cooled. When the rain came, it packed the ash around the rye. The rye germinated and grew prolifically, with anywhere from 25 to 100 stalks (or straws), each with multiple grains. Only two tools were required, the axe and the sickle. The axe cut the trees to start the cycle. When the rye had ripened, it was harvested with a
sickle A sickle, bagging hook, reaping-hook or grasshook is a single-handed agricultural tool designed with variously curved blades and typically used for harvesting, or reaping, grain crops or cutting succulent forage chiefly for feeding livestock, ei ...
, which could reach among the rocks and stumps where a
scythe A scythe ( ) is an agricultural hand tool for mowing grass or harvesting crops. It is historically used to cut down or reap edible grains, before the process of threshing. The scythe has been largely replaced by horse-drawn and then tractor m ...
would have been ineffective. In the second and third year the field would be sown with
turnip The turnip or white turnip (''Brassica rapa'' subsp. ''rapa'') is a root vegetable commonly grown in temperate climates worldwide for its white, fleshy taproot. The word ''turnip'' is a compound of ''turn'' as in turned/rounded on a lathe and ' ...
s or
cabbage Cabbage, comprising several cultivars of ''Brassica oleracea'', is a leafy green, red (purple), or white (pale green) biennial plant grown as an annual vegetable crop for its dense-leaved heads. It is descended from the wild cabbage ( ''B.&nb ...
s. It then might be grazed for several years before being allowed to return to woodland.


culture

required felling new forest and burning a new area every year. It was necessary to allow the former fields to regrow with forest for 10–30 years before repeating the cycle. As a result, the dwellings were often many kilometers from the fields. Furthermore, since the process was man-power intensive, extended families tended to work together and live in compact communities. The farming approach required a large area. When forest was plentiful, the Finns were very prosperous. As population grew and restrictions were placed on the forest which could be burned, it became increasingly difficult. By 1710, during the conflict with Sweden, because of their suspect loyalties Norwegian authorities considered expelling them from the border area, but did not do so because it was judged they were too poor to survive if evicted.


Research

This type of agriculture is discouraged by many developmental or environmentalist organisations, with the main alternatives being promoted are switching to more
intensive In grammar, an intensive word form is one which denotes stronger, more forceful, or more concentrated action relative to the root on which the intensive is built. Intensives are usually lexical formations, but there may be a regular process for for ...
, permanent farming methods, or promoting a shift from farming to working in different, higher-paying industries altogether. Other organisations promote helping farmers achieve higher productivity by introducing new techniques. Not allowing the slashed vegetation to burn completely and ploughing the resultant charcoal into the soil (
slash-and-char Slash-and-char is an alternative to slash-and-burn that has a lesser effect on the environment. It is the practice of charring the biomass resulting from the slashing, instead of burning it. The resulting residue matter charcoal can be utilized ...
) has been proposed as way to boost yields. Promoters of a project from the early 2000s claimed that slash-and-burn cultivation could be reduced if farmers grew black pepper crops between ''
Inga ''Inga'' is a genus of small tropical, tough-leaved, nitrogen-fixing treesElkan, Daniel. "Slash-and-burn farming has become a major threat to the world's rainforest" ''The Guardian'' 21 April 2004 and shrubs, subfamily Mimosoideae. ''Inga''s l ...
'' trees, which they termed '
Inga alley cropping Inga alley cropping is the planting agricultural crops between rows of Inga trees. It has been promoted by Mike Hands. Using the Inga tree for alley cropping has been proposed as an alternative to the much more ecologically destructive slash an ...
'. A method of improving the yields in a type of traditional assarting cultivation used to grow common beans in Central American called 'slash-and-cover', has been proposed, by additionally planting
leguminous A legume () is a plant in the family Fabaceae (or Leguminosae), or the fruit or seed of such a plant. When used as a dry grain, the seed is also called a pulse. Legumes are grown agriculturally, primarily for human consumption, for livestock for ...
shrubs to act as a fallow crop after the soil is exhausted and one is ready to clear a new patch of forest.


Gallery

Bolivia slash & burn lo (4386225275).jpg , Santa Cruz,
Bolivia , image_flag = Bandera de Bolivia (Estado).svg , flag_alt = Horizontal tricolor (red, yellow, and green from top to bottom) with the coat of arms of Bolivia in the center , flag_alt2 = 7 × 7 square p ...
An example of slash and burn agriculture practice Thailand.jpg ,
Chiang Mai Chiang Mai (, from th, เชียงใหม่ , nod, , เจียงใหม่ ), sometimes written as Chiengmai or Chiangmai, is the largest city in northern Thailand, the capital of Chiang Mai province and the second largest city in ...
,
Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is bo ...
Jhum fire.jpg ,
Arunachal Pradesh Arunachal Pradesh (, ) is a state in Northeastern India. It was formed from the erstwhile North-East Frontier Agency (NEFA) region, and became a state on 20 February 1987. It borders the states of Assam and Nagaland to the south. It shares int ...
, India


See also

* 2006 Southeast Asian haze * 2013 Southeast Asian haze * 2015 Southeast Asian haze * 2019 Amazon rainforest wildfires *
History of the forest in Central Europe The history of the forest in Central Europe is characterised by thousands of years of exploitation by people. Thus a distinction needs to be made between the botanical natural history of the forest in pre- and proto-historical times—which f ...
*
Scorched earth A scorched-earth policy is a military strategy that aims to destroy anything that might be useful to the enemy. Any assets that could be used by the enemy may be targeted, which usually includes obvious weapons, transport vehicles, communi ...


General literature

* * Nesholen, Birger (1994). "Svedjebrukerne", ''Østlandske Skogsområder'',
Den Norske Turistforening The Norwegian Trekking Association ( no, Den norske turistforening, DNT) is a Norwegian association which maintains mountain trails and cabins in Norway. The association was founded on 21 January 1868 with the scope "to help and develop tourism i ...
. * Pyne, Stephen J. (1997). ''Vestal Fire: An Environmental History, Told Through Fire, of Europe and Europe's Encounter with the World''. Seattle and London: University of Washington Press. . * * Stagg, Frank Noel (1956). ''East Norway and Its Frontier''. Allen & Unwin.


Citations


External links

*
Video of slash-and-burn
at the Telkkämäki Nature Reserve, Finland, in 2012
Video of slash-and-burn
in Sweden around 1930–32 (from the YouTube channel of the
Nordic Museum The Nordic Museum ( sv, Nordiska museet) is a museum located on Djurgården, an island in central Stockholm, Sweden, dedicated to the cultural history and ethnography of Sweden from the early modern period (in Swedish history, it is said to be ...
) {{DEFAULTSORT:Slash-and-burn Agriculture by type Environmental issues with forests Fire in culture Tropical agriculture Forest management Agriculture in Sweden Agriculture in the United Kingdom Forestry in Finland Forestry in Norway Forestry in Russia Forestry in Sweden Forestry in the United Kingdom Agriculture in Russia Agriculture in Finland