Monoculture is the agricultural practice of producing or growing one single crop over a wide area. The term is also applied in several fields. It is usually developed by extensive growing farmers.
Land Use
The term is mostly used in agriculture and describes the practice of planting crops with the same patterns of growth resulting from genetic similarity. Examples include wheat fields or apple orchards or grape vineyards. These cultivars have uniform growing requirements and habits resulting in greater yields on less land because planting, maintenance (including pest control) and harvesting can be standardized. This standardization results in less waste and loss from inefficient harvesting and planting. It also is beneficial because a crop can be tailor planted for a location that has special problems - like soil salt or drought or a short growing season.
Monoculture produces great yields by utilizing plants' abilities to maximize growth under less pressure from other species and more uniform plant structure. Uniform cultivars are able to better use available light and space, but also have a greater drain on soil nutrients. In the last 40 years modern practices such as monoculture planting and the use of synthesized fertilizers have greatly reduced the amount of land needed to produce much higher yielding crops. The success of monoculture cropping has produced a world wide surplus of food stuffs that has depressed crop prices that farms receive.
Forestry
In forestry, monoculture refers to the planting of one species of tree. Monoculture plantings provide great yields and more effective growth and 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 also harvested by clear cutting, which drastically alters the habitat. Also the mechanical harvesting of trees can compact soils, which effects the under story growth. Single species planting of trees also are more vulnerable when infected with a pathogen, or are attacked by insects, and by adverse environmental conditions.
Lawns and animals
Examples of monoculture include lawns and most field crops, such as wheat or corn. The term is also used where a single species of farm animal is raised in large-scale concentrated animal feeding operations (CAFOs).
Disease
Monocultures used in agriculture are usually single strains that have been bred to be high yield and resistant to certain common diseases. As all plants in a monoculture are almost entirely genetically identical, if a disease strikes to which they have no resistance, it can destroy entire populations of crops, whereas in a polyculture, some portion of the crop will usually survive due to natural variation giving some of them resistance. There is increasing support for moving away from monocultures towards a mixture of varieties as a way to limit the impacts of disease to these sorts of crops, and some studies have shown planting a mixture of crop strains in the same field to be effective at combatting disease.
There is currently a great deal of international worry about the wheat leaf rust fungus, that has already decimated wheat crops in Uganda and Kenya, and is starting to make inroads into Asia as well. As much of the worlds wheat crops are very genetically similar following the Green Revolution, the impacts of such diseases threaten agricultural production worldwide.
Polyculture
Main article: PolycultureThe environmental movement seeks to change popular culture by redefining the "perfect lawn" to be something other than a turf monoculture, and seeks agricultural policy that provides greater encouragement for more diverse cropping systems. Local food systems may also encourage growing multiple species and a wide variety of crops at the same time and same place. Heirloom gardening has come about largely as a reaction against monocultures in agriculture.
See also
- Crop diversity
- Biodiversity
- Heirloom gardening
- Neglected crops
- Seed bank
- Three Sisters
- Underutilized crops
- Genetically modified organism
External links
- Monoculture and disease
References
- ^ http://www.ag-network-chile.net/Monoculture%20Forestry.htm
- ^ http://www.umich.edu/~nre301/forestry-02.doc
- ^ Richardson, Edited by David M. (2000), Ecology and biogeography of Pinus , Cambridge, U.K., pp. 371, doi: 10.2277/ , ISBN 9780521789103
- ^ http://www.epa.gov/oecaagct/forestry.html
- ^ http://www.nature.com/nature/journal/v406/n6797/abs/406718a0.html
- ^ http:
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