Land capable of being ploughed and used to grow crops
Modern mechanised agriculture permits large fields like this one in Dorset, England
Arable land (from the Latin: arabilis, "able to be ploughed") is any land capable of being ploughed and used to grow crops.[1] Alternatively, for the purposes of agricultural statistics,[2] the term often has a more precise definition:
Arable land is the land under temporary agricultural crops (multiple-cropped areas are counted only once), temporary meadows for mowing or pasture, land under market and kitchen gardens and land temporarily fallow (less than five years). The abandoned land resulting from shifting cultivation is not included in this category. Data for 'Arable land' are not meant to indicate the amount of land that is potentially cultivable.[3]
A more concise definition appearing in the Eurostat glossary similarly refers to actual rather than potential uses: "land worked (ploughed or tilled) regularly, generally under a system of crop rotation".[4] In Britain, arable land has traditionally been contrasted with pasturable land such as heaths, which could be used for sheep-rearing but not as farmland.
Arable land is vulnerable to land degradation and some types of un-arable land can be enriched to create useful land. Climate change and biodiversity loss, are driving pressure on arable land.[5]
By country
Share of land area used for arable agriculture, OWID
According to the Food and Agriculture Organization of the United Nations, in 2013, the world's arable land amounted to 1.407 billion hectares, out of a total of 4.924 billion hectares of land used for agriculture.[6]
Water buffalo ploughing rice fields near Salatiga, Central Java, IndonesiaA pasture in the East Riding of Yorkshire in England
Agricultural land that is not arable according to the FAO definition above includes:
Meadows and pastures – land used as pasture and grazed range, and those natural grasslands and sedge meadows that are used for hay production in some regions.
Permanent crop – land that produces crops from woody vegetation, e.g. orchard land, vineyards, coffee plantations, rubber plantations, and land producing nut trees;
Other non-arable land includes land that is not suitable for any agricultural use. Land that is not arable, in the sense of lacking capability or suitability for cultivation for crop production, has one or more limitations – a lack of sufficient freshwater for irrigation, stoniness, steepness, adverse climate, excessive wetness with the impracticality of drainage, excessive salts, or a combination of these, among others.[8] Although such limitations may preclude cultivation, and some will in some cases preclude any agricultural use, large areas unsuitable for cultivation may still be agriculturally productive. For example, United States NRCS statistics indicate that about 59 percent of US non-federal pasture and unforested rangeland is unsuitable for cultivation, yet such land has value for grazing of livestock.[9] In British Columbia, Canada, 41 percent of the provincial Agricultural Land Reserve area is unsuitable for the production of cultivated crops, but is suitable for uncultivated production of forage usable by grazing livestock.[10] Similar examples can be found in many rangeland areas elsewhere.
Changes in arability
Land conversion
Land incapable of being cultivated for the production of crops can sometimes be converted to arable land. New arable land makes more food and can reduce starvation. This outcome also makes a country more self-sufficient and politically independent, because food importation is reduced. Making non-arable land arable often involves digging new irrigation canals and new wells, aqueducts, desalination plants, planting trees for shade in the desert, hydroponics, fertilizer, nitrogen fertilizer, pesticides, reverse osmosis water processors, PET film insulation or other insulation against heat and cold, digging ditches and hills for protection against the wind, and installing greenhouses with internal light and heat for protection against the cold outside and to provide light in cloudy areas. Such modifications are often prohibitively expensive. An alternative is the seawater greenhouse, which desalinates water through evaporation and condensation using solar energy as the only energy input. This technology is optimized to grow crops on desert land close to the sea.
The use of artifices does not make the land arable. Rock still remains rock, and shallow – less than 6 feet (1.8 metres) – turnable soil is still not considered toilable. The use of artifice is an open-air none recycled water hydroponics relationship.[clarification needed] The below described circumstances are not in perspective, have limited duration, and have a tendency to accumulate trace materials in soil that either there or elsewhere cause deoxygenation. The use of vast amounts of fertilizer may have unintended consequences for the environment by devastating rivers, waterways, and river endings through the accumulation of non-degradable toxins and nitrogen-bearing molecules that remove oxygen and cause non-aerobic processes to form.
Examples of infertile non-arable land being turned into fertile arable land include:
Aran Islands: These islands off the west coast of Ireland (not to be confused with the Isle of Arran in Scotland's Firth of Clyde) were unsuitable for arable farming because they were too rocky. The people covered the islands with a shallow layer of seaweed and sand from the ocean. Today,[when?] crops are grown there, even though the islands are still considered non-arable.
Israel: The construction of desalination plants along Israel's coast allowed agriculture in some areas that were formerly desert. The desalination plants, which remove the salt from ocean water, have produced a new source of water for farming, drinking, and washing.
Slash and burn agriculture uses nutrients in wood ash, but these expire within a few years.
Terra preta, fertile tropical soils produced by adding charcoal.
Land degradation
Serious land degradation in Nauru after the depletion of the phosphate cover through mining
Land degradation is a process in which the value of a biophysical or biochemical environment is affected by a combination of natural or human-induced processes acting upon the land.[11][12]
It is viewed as any change or disturbance to the land perceived to be deleterious or undesirable.[13]Natural hazards are excluded as a cause; however human activities can indirectly affect phenomena such as floods and bush fires.
Expert projections suggest that land degradation will be an important theme of the 21st century, impacting agricultural productivity, biodiversity loss, environmental change, and its effects on food security.[14] It is estimated that up to 40% of the world's agricultural land is seriously degraded.[15]
The United Nations estimate that about 30% of land is degraded worldwide, and about 3.2 billion people reside in these degrading areas, giving a high rate of environmental pollution.[17] About 12 million hectares of productive land—which roughly equals the size of Greece—is degraded every year. This happens because people exploit the land without protecting it.[18][19] The United Nations Sustainable Development Goal 15 has a target to restore degraded land and soil and achieve a land degradation-neutral world by 2030.[20]
Examples
Examples of fertile arable land being turned into infertile land include:
Each year, arable land is lost due to desertification and human-induced erosion. Improper irrigation of farmland can wick the sodium, calcium, and magnesium from the soil and water to the surface. This process steadily concentrates salt in the root zone, decreasing productivity for crops that are not salt-tolerant.
Rainforest deforestation: The fertile tropical forests are converted into infertile desert land. For example, Madagascar's central highland plateau has become virtually totally barren (about ten percent of the country) as a result of slash-and-burndeforestation, an element of shifting cultivation practiced by many natives.
^The World Bank. Agricultural land (% of land area) http://data.worldbank.org/indicator/AG.LND.AGRI.ZS Archived 17 May 2015 at the Wayback Machine
^FAOSTAT. [Statistical database of the Food and Agriculture Organization of the United Nations] Glossary. http://faostat3.fao.org/Archived 1 June 2015 at the Wayback Machine
^Eurostat. Glossary: Arable land. http://ec.europa.eu/eurostat/statistics-explained/index.php/Glossary:Arable_land Archived 7 May 2015 at the Wayback Machine
^IPCC (2019). Shukla, P.R.; Skea, J.; Calvo Buendia, E.; Masson-Delmotte, V.; et al. (eds.). IPCC Special Report on Climate Change, Desertification, Land Degradation, Sustainable Land Management, Food Security, and Greenhouse gas fluxes in Terrestrial Ecosystems (PDF). In press. https://www.ipcc.ch/report/srccl/.
^ a b"FAOSTAT Land Use module". Food and Agriculture Organization. Archived from the original on 16 August 2016. Retrieved 8 July 2016.
^United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. Agriculture Handbook 210. 21 pp.
^NRCS. 2013. Summary report 2010 national resources inventory. The United States Natural Resources Conservation Service. 163 pp.
^Agricultural Land Commission. Agriculture Capability and the ALR Fact Sheet. http://www.alc.gov.bc.ca/alc/DownloadAsset?assetId=72876D8604EC45279B8D3C1B14428CF8&filename=agriculture_capability__the_alr_fact_sheet_2013.pdf[permanent dead link]
^Conacher, Arthur; Conacher, Jeanette (1995). Rural Land Degradation in Australia. South Melbourne, Victoria: Oxford University Press Australia. p. 2. ISBN 0-19-553436-0.
^"Desertification - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 20 June 2024.
^Johnson, D.L., S.H. Ambrose, T.J. Bassett, M.L. Garfield Bowen, D.E. Crummey, J.S. Isaacson, D.N. Johnson, P. Lamb, M. Saul, and A.E. Winter-Nelson. 1997. Meanings of environmental terms. Journal of Environmental Quality 26: 581–589.
^Eswaran, H.; R. Lal; P.F. Reich (2001). "Land degradation: an overview". Responses to Land Degradation. Proc. 2nd. International Conference on Land Degradation and Desertification. New Delhi: Oxford Press. Archived from the original on 20 January 2012. Retrieved 5 February 2012.
^Ian Sample (31 August 2007). "Global food crisis looms as climate change and population growth strip fertile land". The Guardian. Archived from the original on 29 April 2016. Retrieved 23 July 2008.
^Summary for Policymakers. In: Climate Change and Land: an IPCC special report on climate change, desertification, land degradation, sustainable land management, food security, and greenhouse gas fluxes in terrestrial ecosystems (PDF). Intergovernmental Panel on Climate Change. 2019. p. 5. Archived (PDF) from the original on 17 February 2020. Retrieved 30 January 2020.
^Le, Quang Bao; Nkonya, Ephraim; Mirzabaev, Alisher (2014). "Biomass Productivity-Based Mapping of Global Land Degradation Hotspots". SSRN Electronic Journal. doi:10.2139/ssrn.2465799. hdl:10419/106616. ISSN 1556-5068. S2CID 126829880.
^"Artificial intelligence makes restaurants and farms more sustainable". European Investment Bank. Archived from the original on 29 July 2021. Retrieved 29 July 2021.
^"24 billion tons of fertile land lost every year, warns UN chief on World Day to Combat Desertification". UN News. 16 June 2019. Archived from the original on 28 June 2021. Retrieved 29 July 2021.
^"Goal 15 targets". UNDP. Archived from the original on 4 September 2017. Retrieved 24 September 2020.
External links
Look up arable in Wiktionary, the free dictionary.
Article from Technorati on Shrinking Arable Farmland in the world
