A quite different kind of definition is used by various agencies concerned with agriculture. In providing statistics on arable land, the FAO and the World Bank use the definition provided in the glossary accompanying FAOSTAT: “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.” A briefer definition appearing in the Eurostat glossary similarly refers to actual, rather than potential use: “land worked (ploughed or tilled) regularly, generally under a system of crop rotation.”
In 2008, the world's arable land amounted to 1,386 M ha, out of a total 4,883 M ha land used for agriculture. This figure and the data below refer to arable land as defined by the FAO (above). Arable land in the accompanying map refers to a definition used by the US CIA, which resembles that of the FAO.
Water Buffalo ploughing rice fields near Salatiga, Central Java, Indonesia
Agricultural land that is not arable according to the FAO definition above includes land that produces crops from woody vegetation, e.g. orchardland, vineyards, coffee plantations, rubber plantations, and land producing nut trees; in addition to land used as pasture and grazed range, and those natural grasslands and sedge meadows that are used for hay production in some regions. Other non-arable land includes land unsuitable 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 e.g. lack of sufficient fresh water for irrigation, stoniness, steepness, adverse climate, excessive wetness with impracticality of drainage, excessive salts, among others.  Although such limitations may preclude cultivation, and some will in some cases preclude any agricultural use, large areas unsuitable for cultivation are agriculturally productive. For example, US 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. In British Columbia, Canada, 41 percent of the provincial Agricultural Land Reserve area is unsuitable for production of cultivated crops, but is suitable for uncultivated production of forage usable by grazing livestock. Similar examples can be found in many rangeland areas elsewhere.
Land incapable of being cultivated for 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 greenhouses with internal light and heat for protection against the cold outside and to provide light in cloudy areas. This process is often extremely 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.
Some examples of infertile non-arable land being turned into fertile arable land are:
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. This made it arable. Today, crops are grown there.
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 created 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 created by adding charcoal.
Some examples of fertile arable land being turned into infertile land are:
Each year, arable land is lost due to desertification and human-induced erosion. Improper irrigation of farm land 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.
^"The CIA World Factbook". Central Intelligence Agency. Retrieved June 2006. Percentage shares of total land area [by country] used for arable land - land cultivated for crops like wheat, maize, and rice that are replanted after each harvest
^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. United States Natural Resources Conservation Service. 163 pp.