Monoculture

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Monocultural potato field 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. [1] Monoculture is widely used in intensive farming and in organic farming: both a 1,000-hectare cornfield and a 10-ha field of organic kale are monocultures. Monoculture of crops has allowed farmers to increase efficiency in planting, managing, and harvesting, mainly by facilitating the use of machinery in these operations, but monocultures can also increase the risk of diseases or pest outbreaks. This practice is particularly common in industrialized nations worldwide. Diversity can be added both in time, as with a crop rotation or sequence, or in space, with a polyculture or intercropping (see table below).

Contents

Continuous monoculture, or monocropping, where farmers raise the same species year after year, can lead to the quicker buildup and spread of pests and diseases in a susceptible crop.

The term "oligoculture" has been used to describe a crop rotation of just a few crops, as practiced in several regions of the world. [2]

The concept of monoculture can also extend to (for example) discussions of variety in urban landscapes. [3]

Agriculture

In an agricultural context, the term describes the practice of planting one species in a field. [4] Examples of monoculture include lawns, fields of wheat or corn, or an apple orchard.

Diversity of crops in space and time; monocultures and polycultures, and rotations of both. [5]
Diversity in time
LowHigher
CyclicDynamic (non-cyclic)
Diversity in spaceLowMonoculture, one species in a fieldContinuous

monoculture,

monocropping

Crop rotation

(rotation of monocultures)

Sequence of monocultures
HigherPolyculture, two or more species

intermingled in a field (intercropping)

Continuous

polyculture

Rotation of polyculturesSequence 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.

Benefits

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. [6] Modern practices such as monoculture planting and the use of synthesized fertilizers have reduced the amount of additional land needed to produce food, [7] called land sparing.

Risks

Monocultures of perennials, such as African palm oil, [8] sugarcane, [9] [10] tea [11] [12] and pines, [13] can lead to soil and environmental problems such as soil acidification, degradation, and soil-borne diseases, which ultimately have a negative impact on agricultural productivity and sustainability. [9] Diverse rotations of crop monocultures can minimize the risk of disease and pest outbreaks. [14] However, the shorter the rotation (fewer crops included) the higher the risk. There are examples of short, two-year rotations selecting for pests that are adapted to such rotations. [15] Ultimately the negative impact of monocultures comes down to two things; loss of biodiversity and the use of pesticides. [16] Healthy ecosystems and habitats are home to hundreds of plant, insect, and animal species. When big stretches of land are used for only one species, the entire balance is disturbed. Important environmental services that are normally provided by the many different species are now left undone. Lower levels of biodiversity on agricultural land also mean that certain insects are left with no natural predators, resulting in their population growing out of control. [16] To control pests on their crops, farmers use heavy pesticides. These can further reduce levels of biodiversity but are also a danger to bodies of water due to chemical run-off. [16]

Forestry

In forestry, monoculture refers to the planting of one species of tree. [17] Monoculture plantings provide greater yields[ citation needed ] and more efficient harvesting than natural stands of trees. Single-species stands of trees are often the natural way trees grow, but the stands show a diversity in tree sizes, with dead trees mixed with mature and young trees. In forestry, monoculture stands that are planted and harvested as a unit provide limited resources for wildlife that depend on dead trees and openings since all the trees are the same size; they are most often harvested by clearcutting, which drastically alters the habitat. The mechanical harvesting of trees can compact soils, which can adversely affect understory growth. [18] single-species planting also causes trees to be more vulnerable when they are infected with a pathogen, attacked by insects, [19] or affected by adverse environmental conditions. [20]

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. [21] 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. However, the drive for its widespread use primarily came from social pressures. At the local level, governments and organizations have begun to take monocultural practices into their own hands (think Homeowner Associations). Various issues related to maintenance of private property have occurred, such as maintaining aesthetics and real estate value. Disagreements in residential maintenance of weeds, lawns, etc, have resulted in civil cases or even direct aggression against neighbors. [21]

Like agriculture, the 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. One major risk associated with pesticides on lawns include exposure of chemicals into the home through the air, clothing, and furniture which can be more detrimental to children than to the average adult. [21]

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. As of 2009 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. [22] 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. [23] This meant that 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. [24]

Cattle

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

The term is also used where a single breed of farm animal is raised in large-scale concentrated animal feeding operations (CAFOs).

Many of today's[ when? ] 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 traits such 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. [25]

Benefits of genetic diversity

While having little to no variety in the genetics of an agricultural system can have drawbacks, increasing genetic diversity by introducing organisms with varying genes can divert them and make the system more sustainable. For example, by having crops with varying genetic traits for disease and pest resistance, there is a much lower chance of having those pests or diseases spread throughout the area. This is because if one crop becomes infected with a particular strain of disease or species of pest, there is a chance that the other plants around it will have genes that protect them from that strain or species. [26] This can help increase crop productivity while simultaneously lowering pesticide usage and risk of exposure.

Monofunctionality

Monofunctionality is an analogous concept; however, it is entirely possible for a monofunctional land bloc to have its function produced by multiple species and so does not suffer from all the same downsides. When industrialisation first came to agriculture and silviculture, monofunctionality was advocated as the ideal due to the significant initial advantages in economic efficiency. However, in the years since opinion has shifted away. In the years since it has become clear that monofunctionality suffers from some of the same downsides as monoculture, specifically forgoing synergies and failing to fulfill the whole range of human needs. [27]

See also

Related Research Articles

<span class="mw-page-title-main">Crop rotation</span> Agricultural practice of changing crops

Crop rotation is the practice of growing a series of different types of crops in the same area across a sequence of growing seasons. This practice reduces the reliance of crops on one set of nutrients, pest and weed pressure, along with the probability of developing resistant pests and weeds.

<span class="mw-page-title-main">Intensive farming</span> Branch of agricultire

Intensive agriculture, also known as intensive farming, conventional, or industrial agriculture, is a type of agriculture, both of crop plants and of animals, with higher levels of input and output per unit of agricultural land area. It is characterized by a low fallow ratio, higher use of inputs such as capital, labour, agrochemicals and water, and higher crop yields per unit land area.

<span class="mw-page-title-main">Intercropping</span> Multiple cropping practice involving growing two or more crops in proximity

Intercropping is a multiple cropping practice that involves the cultivation of two or more crops simultaneously on the same field, a form of polyculture. The most common goal of intercropping is to produce a greater yield on a given piece of land by making use of resources or ecological processes that would otherwise not be utilized by a single crop.

<i>Oxalis tuberosa</i> Species of plant

Oxalis tuberosa is a perennial herbaceous plant that overwinters as underground stem tubers. These tubers are known as uqa in Quechua, oca in Spanish, yams in New Zealand and a number of other alternative names. The plant was brought into cultivation in the central and southern Andes for its tubers, which are used as a root vegetable. The plant is not known in the wild, but populations of wild Oxalis species that bear smaller tubers are known from four areas of the central Andean region. Oca was introduced to Europe in 1830 as a competitor to the potato, and to New Zealand as early as 1860.

<span class="mw-page-title-main">Polyculture</span> Growing multiple crops together in agriculture

In agriculture, polyculture is the practice of growing more than one crop species together in the same place at the same time, in contrast to monoculture, which had become the dominant approach in developed countries by 1950. Traditional examples include the intercropping of the three sisters, namely maize, beans, and squashes, by indigenous peoples of Central and North America, the rice-fish systems of Asia, and the complex mixed cropping systems of Nigeria.

<span class="mw-page-title-main">Cowpea</span> Species of plant

The cowpea is an annual herbaceous legume from the genus Vigna. Its tolerance for sandy soil and low rainfall have made it an important crop in the semiarid regions across Africa and Asia. It requires very few inputs, as the plant's root nodules are able to fix atmospheric nitrogen, making it a valuable crop for resource-poor farmers and well-suited to intercropping with other crops. The whole plant is used as forage for animals, with its use as cattle feed likely responsible for its name.

<span class="mw-page-title-main">Agricultural biodiversity</span> Agricultural concept

Agricultural biodiversity or agrobiodiversity is a subset of general biodiversity pertaining to agriculture. It can be defined as "the variety and variability of animals, plants and micro-organisms at the genetic, species and ecosystem levels that sustain the ecosystem structures, functions and processes in and around production systems, and that provide food and non-food agricultural products.” It is managed by farmers, pastoralists, fishers and forest dwellers, agrobiodiversity provides stability, adaptability and resilience and constitutes a key element of the livelihood strategies of rural communities throughout the world. Agrobiodiversity is central to sustainable food systems and sustainable diets. The use of agricultural biodiversity can contribute to food security, nutrition security, and livelihood security, and it is critical for climate adaptation and climate mitigation.

In agriculture, monocropping is the practice of growing a single crop year after year on the same land. Maize, soybeans, and wheat are three common crops often monocropped. Monocropping is also referred to as continuous cropping, as in "continuous corn." Monocropping allows for farmers to have consistent crops throughout their entire farm. They can plant only the most profitable crop, use the same seed, pest control, machinery, and growing method on their entire farm, which may increase overall farm profitability.

<i>Radopholus similis</i> Species of roundworm

Radopholus similis is a species of nematode known commonly as the burrowing nematode. It is a parasite of plants, and it is a pest of many agricultural crops. It is an especially important pest of bananas, and it can be found on coconut, avocado, coffee, sugarcane, other grasses, and ornamentals. It is a migratory endoparasite of roots, causing lesions that form cankers. Infected plants experience malnutrition.

This is an alphabetical index of articles related to gardening.

Forest integrated pest management or Forest IPM is the practice of monitoring and managing pest and environmental information with pest control methods to prevent pest damage to forests and forest habitats by the most economical means.

<span class="mw-page-title-main">Crop</span> Plant or animal product which can be grown and harvested

A crop is a plant that can be grown and harvested extensively for profit or subsistence. In other words, crop is a plant or plant product that is grown for a specific purpose such as food, fibre or fuel.

<span class="mw-page-title-main">Take-all</span> Fungal plant disease

Take-all is a plant disease affecting the roots of grass and cereal plants in temperate climates caused by the fungus Gaeumannomyces tritici. All varieties of wheat and barley are susceptible. It is an important disease in winter wheat in Western Europe particularly, and is favoured by conditions of intensive production and monoculture.

<span class="mw-page-title-main">Intensive crop farming</span> Modern form of farming

Intensive crop farming is a modern industrialized form of crop farming. Intensive crop farming's methods include innovation in agricultural machinery, farming methods, genetic engineering technology, techniques for achieving economies of scale in production, the creation of new markets for consumption, patent protection of genetic information, and global trade. These methods are widespread in developed nations.

<span class="mw-page-title-main">Shade-grown coffee</span>

Shade-grown coffee is a form of the crop produced from coffee plants grown under a canopy of trees. A canopy of assorted types of shade trees is created to cultivate shade-grown coffee. Because it incorporates principles of natural ecology to promote natural ecological relationships, shade-grown coffee can be considered an offshoot of agricultural permaculture or agroforestry. The resulting coffee can be marketed as "shade-grown".

Crop diversity or crop biodiversity is the variety and variability of crops, plants used in agriculture, including their genetic and phenotypic characteristics. It is a subset of a specific element of agricultural biodiversity. Over the past 50 years, there has been a major decline in two components of crop diversity; genetic diversity within each crop and the number of species commonly grown.

<span class="mw-page-title-main">Grand Nain</span> Edible fruit cultivar

The Grand Nain banana is a banana cultivar of Musa acuminata. It is one of the most commonly cultivated bananas and a member of the commercial Cavendish banana cultivar group. It is also known as the Chiquita banana because it is the main product of Chiquita Brands International.

The term cropping system refers to the crops, crop sequences and management techniques used on a particular agricultural field over a period of years. It includes all spatial and temporal aspects of managing an agricultural system. Historically, cropping systems have been designed to maximise yield, but modern agriculture is increasingly concerned with promoting environmental sustainability in cropping systems.

Costa Rican agriculture plays a profound part in the country's gross domestic product (GDP). It makes up about 6.5% of Costa Rica's GDP, and 14% of the labor force. Depending upon location and altitude, many regions differ in agricultural crops and techniques. The main exports include: bananas, pineapples, coffee, sugar, rice, vegetables, tropical fruits, ornamental plants, corn, potatoes and palm oil.

Flhorban 920 (FB920) is a synthetic banana hybrid developed as a cultivar of banana naturally resistant to Black and Yellow Sigatoka fungi in an attempt to replace the highly susceptible Cavendish banana. Additionally, FB920 has been shown to improve root resistance to Burrowing nematodes.

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