Monoculture

File:Tractors in Potato Field.jpg

Monocultural potato field

In agriculture, monoculture is the practice of growing one crop species in a field at a time.<ref>Template:Cite journal</ref> Monocultures increase ease and efficiency in planting, managing, and harvesting crops short-term, often with the help of machinery. However, monocultures are more susceptible to diseases or pest outbreaks long-term<ref name="duffy" /><ref name=":10" /> due to localized reductions in biodiversity and nutrient depletion.<ref name="link.springer.com" /><ref name=":8" /> Crop diversity can be added both in time, as with a crop rotation or sequence, or in space, with a polyculture or intercropping.<ref name=":15" />

Monocultures appear in contexts outside of agriculture and food production. Grass lawns are a common form of residential monocultures.<ref name=":0" /> Several monocultures, including single-species forest plantations, have become increasingly abundant throughout the tropics following market globalization, impacting local communities.<ref name=":8" /><ref name=":7" /><ref name=":14" />

Genetic monocultures refer to crops that have little to no genetic variation. This is achieved using cultivars, made through processes of propagation<ref name=":16" /> and selective breeding,<ref name=":17" /> and can make populations susceptible to disease.

Agroecological practices,<ref name=":6" /> silvo-pastoral systems,<ref name=":4" /> and mixed-species plantations<ref name=":3" /> are common alternatives to monoculture that help preserve biodiversity while maintaining productivity.

Agriculture

Agricultural monocultures refer to the practice of planting one crop species in a field.<ref>Template:Cite book</ref> Monoculture is widely used in intensive farming and in organic farming. In crop monocultures, each plant in a field has the same standardized planting, maintenance, and harvesting requirements resulting in greater yields and lower costs. When a crop is matched to its well-managed environment, a monoculture can produce higher yields than a polyculture.<ref>Template:Cite journal</ref> Modern practices such as monoculture planting and the use of synthesized fertilizers have reduced the amount of additional land needed to produce food,<ref name="MillerSpoolman2008">Template:Cite book</ref> called land sparing.

citation

CitationClass=web }}</ref>				Diversity in time
Low				Higher
				Cyclic	Dynamic (non-cyclic)
Diversity in space	Low	Monoculture, one species in a field	Continuous monoculture, monocropping	Crop rotation (rotation of monocultures)	Sequence of monocultures
	Higher	Polyculture, two or more species intermingled in a field (intercropping)	Continuous polyculture	Rotation of polycultures	Sequence of polycultures

Note that the distinction between monoculture and polyculture is not the same as between monocropping and intercropping. The first two describe diversity in space, as does intercropping. Monocropping and crop rotation describe diversity over time.

Environmental impacts

Monocultures of perennials, such as African palm oil,<ref>Template:Cite journal</ref> sugarcane,<ref name="link.springer.com">Template:Cite journal</ref><ref>Template:Cite journal</ref> tea<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> and pines,<ref>Template:Cite journal</ref> can change soil chemistry leading to soil acidification, degradation, and soil-borne diseases, ultimately having a negative impact on agricultural productivity and sustainability.<ref name="link.springer.com" /> The use of unregulated irrigation practices on popular monocultures, such as soy, can also lead to erosion and water loss.<ref name=":7">Template:Cite journal</ref> As soil health declines, use of synthetic fertilizers on monocultural fields increases, often having negative implications on human health via chemical run-off.<ref name=":7" /><ref name="duffy">Template:Cite journal</ref>

In addition to soil depletion, monocultures can cause significant reductions in biodiversity due to unavailability of resources, native species displacement, and loss of genetic variation.<ref name=":8">Template:Cite journal</ref> Following large-scale oil palm plantations in Latin America, research has revealed extensive declines in mammal, bird, amphibian, and pollinator diversity, particularly in Colombia and Brazil.<ref name=":9" />

Due to insufficient biodiversity and population balance, monocultures are associated with higher rates of disease and pest outbreaks.<ref name="duffy" /><ref name=":10" /> In response, pesticides are widely applied to agricultural fields, further harming insect and pollinator diversity<ref name=":4" /> and human health.<ref name=":8" /><ref name=":11">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Increasing rotations of crop monocultures or using alternatives agricultural practices can help mitigate the risk of disease and attack.<ref name=":10">Template:Cite journal</ref>

Social impacts

Environmental consequences of monocultural farming have notable social impacts, commonly concentrated to the reduction of small-scale farmers<ref name=":8" /> and pesticide-related health issues.<ref name=":7" /><ref name=":11" /> Monoculture is contradictive to several primitive, more sustainable farming practices utilized by small-scale farmers.<ref name=":8" /> Following pest outbreaks, over 600 million liters of pesticides are sprayed annually, contaminating nearby small-scale farming and causing communal health decline.<ref name=":11" /> Research has revealed increased prevalence of pesticide-related disorders, diseases, and cancers affecting the human neurological, gastrointestinal, skin, and respiratory systems.<ref name=":11" />

Agro-extractivism

Agro-extractivism is a form of extractivism in which foreign territorial, political, and economical dominance over agriculture is motivated by the large-scale production and exportation of agricultural commodities, often in the form of monocultures.<ref>Template:Cite journal</ref>

Several monocultures in the Global South, such as sugar and coffee, were first planted in the 1800s following European colonization.<ref name=":12">Template:Cite journal</ref> These plantations used slave labor,<ref name=":13">Template:Cite journal</ref> setting a precedent for agriculture being a field dominated by foreign entities in the rest of Latin America and the Caribbean. This social framework has shaped the oppression of Black people and smaller-scale farmers in the face of present-day land acquisition for monocultural use.<ref name=":12" />

The large-scale establishment of monocultures in the tropics has led to hindrance of local small-scale farms and indigenous land rights in the forms of reduced food sovereignty,<ref name=":13" /> food security, land and water access,<ref name=":7" /> and hunting.<ref name=":14">Template:Cite journal</ref> Land privatization and pressure for monocultural expansion by larger companies takes different forms: silent evictions,<ref name=":7" /> violence,<ref name=":14" /> and reverse leasing arrangements.<ref name=":8" /> Introduction to global trade makes small-scale farmers vulnerable to international demand, prices, and variations in climate affecting crop production.<ref name=":14" /> Farmers who make contracts or take out loans with large corporations can face debt and loss of land if they fail to meet certain crop yields or profit.<ref name=":14" />

Monocultures are an aspect of agro-extractivism on account of high percentages of the produced crop being exported for processing and marketing by large transnational corporations, often in developed countries.<ref name=":13" /><ref name=":8" /> For instance, following the North American Free Trade Agreement (NAFTA), agave production increased three-fold in Mexico from 1995 to 2019 due to foreign consumption, specifically by the United States.<ref name=":8" /> Pararguay sees similar demands with soy crops, exporting the majority of production without nutrients returning to native soil.<ref name=":13" /> More than 46 million hectares of soy has been planted across South America while over half a million hectares of land are being deforested annually to make land for cultivation.<ref name=":11" /> Some international companies relevant in the field of agro-extractivist monocultures are Syngenta and Bayer (biotech), Los Grobo, CRESUD, El Tejar, and Maggi (landowners), and Cargill, ADM, and Bunge (grain and seed providers).<ref name=":11" />

Forestry

In forestry, monoculture refers to plantations of one species of tree.<ref>Monoculture Forestry</ref> In many areas of the world, forest monocultures are planted as an efficient way to produce and harvest timber.<ref name=":1" /> Because timber harvest from monoculture forests is often an export-driven industry, these plantations can be a form of extractivism.<ref name=":2">Template:Cite journal</ref> Following deforestation, monoculture afforestation has become increasingly popular due to the necessity for ecosystem services, such as mitigating the effects of climate change via carbon sequestration and gas regulation.<ref name=":1">Template:Cite journal</ref><ref name=":2" /><ref name=":3">Template:Cite journal</ref> Eucalyptus, pines, and acacias are examples of popular monocultures being utilized in the tropics and the Global South following rainforest deforestation.

Environmental impacts

While forest monocultures are efficient ways of producing timber, studies show single-species forests reduce biodiversity, causing declines in forest productivity and native tree, animal, and insect populations over time.<ref name=":1" /><ref name=":3" /><ref name=":9">Template:Cite journal</ref> The loss of biodiversity in forest monocultures is associated with lower forest resistance to pathogens, attack by insects,<ref name="Richardson2000">Template:Cite book</ref> and adverse environmental conditions, such as an acceleration of pedolysis.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Social impacts

Monoculture plantations have been shown to have substantial social impacts on local communities. Forest monocultures have motivated migrations across Latin America due to localized water cycle interference, declining soil health, and changes in resource availability.<ref name=":1" /> While industrial agriculture can increase employment opportunities, studies show forest plantations often have limited employment opportunities, with most workers coming from outside of the community.<ref name=":2" /> Profits made from monoculture plantations historically follow a "boom and bust" trend, temporarily benefitting the community in increased income, revenue, and quality of life until resources are exhausted, with profits rarely distributed back into the deforested land.<ref>Template:Cite journal</ref>

Environmental changes caused by monoculture forests are particularly felt among indigenous communities given their reliance and connection to the land while additionally becoming subject to land privatization.<ref name=":2" /> These lands are frequently acquired through land grabbing and dispossession by large companies in global trade, ultimately reducing rural land, cutting off access to locals, and changing agricultural and community dynamics.<ref>Template:Cite journal</ref>

Residential monoculture

Lawn monoculture in the United States was historically influenced by English gardens and manor-house landscapes, but its inception into the American landscape is fairly recent.<ref name=":0">Template:Cite journal</ref> Aesthetics drove the evolution of the residential green areas, with turfgrass becoming a popular addition to many American homes. Turfgrass is a nonnative species and requires high levels of maintenance. At the local level, governments and organizations, such as Homeowner Associations, have pressured the maintenance of lawn aesthetics and influenced real estate value. Disagreements in residential maintenance of weeds and lawns have resulted in civil cases or direct aggression against neighbors.<ref name=":0" />

High levels of maintenance required for turfgrass created a growing demand for chemical management, i.e. pesticides, herbicides, insecticides. A 1999 study showed that in a sample of urban streams, at least one type of pesticide was found in 99% of the streams. A major risk associated with lawn pesticide use is the exposure to chemicals within the home through the air, clothing, and furniture, which can be more detrimental to children than to the average adult.<ref name=":0" />

Genetic monocultures

While often referring to the production of the same crop species in a field (space), monoculture can also refer to the planting of a single cultivar across a larger regional area, such that there are numerous plants in the area with an identical genetic makeup to each other. When all plants in a region are genetically similar, a disease to which they have no resistance can destroy entire populations of crops. Template:As of the wheat leaf rust fungus caused much concern internationally, having already severely affected wheat crops in Uganda and Kenya, and having started to spread in Asia as well.<ref>Template:Cite news</ref> Given the very genetically similar strains of much of the world's wheat crops following the Green Revolution, the impacts of such diseases threaten agricultural production worldwide.

Historic examples of genetic monocultures

Great Famine of Ireland

In Ireland, exclusive use of one variety of potato, the "lumper", led to the Great Famine of 1845–1849. Lumpers provided inexpensive food to feed the Irish masses. Potatoes were propagated vegetatively with little to no genetic variation. When Phytophthora infestans arrived in Ireland from the Americas in 1845, the lumper had no resistance to the disease, leading to the nearly complete failure of the potato crop across Ireland.

Bananas

Until the 1950s, the Gros Michel cultivar of banana represented almost all bananas consumed in the United States because of their taste, small seeds, and efficiency to produce. Their small seeds, while more appealing than the large ones in other Asian cultivars, were not suitable for planting,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> meaning all new banana plants had to be grown from the cut suckers of another plant. As a result of this asexual form of planting, all bananas grown had identical genetic makeups which gave them no traits for resistance to Fusarium wilt, a fungal disease that spread quickly throughout the Caribbean where they were being grown. By the beginning of the 1960s, growers had to switch to growing the Cavendish banana, a cultivar grown in a similar way. This cultivar is under similar disease stress since all the bananas are clones of each other and could easily succumb as the Gros Michel did.<ref name=":16">Template:Cite journal</ref>

Cattle

File:SOBREVVO EM RONDONIA DIA 07-08-2020 (FOTO BRUNO KELLY) (62) (50224604772).jpg

Aerial view of deforested area prepared for monoculture or cattle ranching, near Porto Velho in Rondônia, Brazil, in 2020

Genetic monoculture can also refer to a single breed of farm animal being raised in large-scale concentrated animal feeding operations (CAFOs). Many livestock production systems rely on just a small number of highly specialized breeds. Focusing heavily on a single trait (output) may come at the expense of other desirable traitsTemplate:Sndsuch as fertility, resistance to disease, vigor, and mothering instincts. In the early 1990s, a few Holstein calves were observed to grow poorly and died in the first 6 months of life. They were all found to be homozygous for a mutation in the gene that caused bovine leukocyte adhesion deficiency. This mutation was found at a high frequency in Holstein populations worldwide. (15% among bulls in the US, 10% in Germany, and 16% in Japan.) Researchers studying the pedigrees of affected and carrier animals tracked the source of the mutation to a single bull that was widely used in livestock production. In 1990 there were approximately 4 million Holstein cattle in the US, making the affected population around 600,000 animals.<ref name=":17">Template:Cite news</ref>

Benefits of genetic diversity

Increasing genetic diversity through the introduction of organisms with varying genes can make agricultural and livestock systems more sustainable. By utilizing crops with varying genetic traits for disease and pest resistance, chances of disease outbreak decrease due to the likelihood of neighboring plants having strain-resistant genes.<ref>Template:Cite journal</ref> This can aid in increasing crop productivity while decreasing pesticide usage.

Alternatives to monoculture

Alternatives to monoculture include the consultation of agroecology,<ref name=":6">Template:Cite journal</ref> silvo-pastoral systems,<ref name=":4">Template:Cite journal</ref> and mixed-species plantations.<ref name=":3" />

Agroecology

Agroecology consults the entire food system, considering how agricultural inputs and outputs affect social, environmental, and economic systems.<ref>Template:Cite journal</ref> Despite the recent dominance of GMO monoculture crop rotations of soy, corn, and cotton across the deforested Amazon, many Afrodescendant-run farms in Brazil continue to use traditional practices of agroecology that have the capacity to sustain the local community, environment, and economy.<ref name=":6" /> Ecosystem-specific ecological damage done by monocultural practices and byproducts, including the use of biocides and soil degradation, can be irreparable.<ref name=":6" /> However, the increasing modern prevalence of regenerative farming reinstates crop rotation and natural nutrient cycling to repair biodiversity and improve soil productivity.<ref>Template:Cite journal</ref>

Silvopasture

Silvopasture is a traditional practice that incorporates the use of various trees and forage in pastures to increase land and livestock productivity.<ref name=":5">Template:Cite journal</ref> Incorporating other plants in pastures, such as tree legumes, has been shown to enhance pollinator activity, benefitting local biodiversity and food security.<ref name=":4" /> Silvopastoral systems provide greater pasture species richness and grazing feed, increasing economic and environmental outcomes on various size scales.<ref name=":5" />

Mixed-species plantations

In several studies, well-managed mixed-species plantations have been shown to produce greater economic outcomes than monocultures with regard to timber sales.<ref name=":1" /><ref name=":3" /> Mixed-species forests are also associated with greater carbon sequestration and biodiversity, presenting a possible mitigation tactic against the climate crisis and current global carbon levels.<ref name=":1" /><ref name=":3" /> However, mixed-species plantations are less common under the misconception of being more expensive and harder to manage.<ref name=":3" />

See also

• Biodiversity
• Cash crop
• Crop diversity
• Crop rotation
• Genetically modified organism
• Intercropping
• Intensive crop farming
• Permaculture
• Polyculture

External links

• Monoculture and disease Template:Webarchive
• Modern Agriculture: Ecological impacts and the possibilities for truly sustainable farming