Agriculture and Farming Atlas
Claims this atlas currently marks as unsettled or as tested and found false. A debated fact is one scholars hold competing positions on; a debunked one has been checked against the record and found not to hold. Both are kept in view rather than quietly smoothed over, with the reasoning that put each one where it stands.
22 statements marked Debated.
Apiculture, DescriptionThe keeping of honey bee colonies, historically in hollow logs, skeps and clay hives before the modern movable-frame box, for honey, wax and pollination. Where deliberate husbandry of bees first replaced simple honey hunting is disputed between an early Anatolian trail and a later, better-documented Egyptian one.
Apiculture, Disciplines
Standing
Concerns Description
Currently States The keeping of honey bee colonies, historically in hollow logs, skeps and clay hives before the modern movable-frame box, for honey, wax and pollination. Where deliberate husbandry of bees first replaced simple honey hunting is disputed between an early Anatolian trail and a later, better-documented Egyptian one.
Sources disagree on where deliberate beekeeping began: Egyptian tomb art shows organized hives by roughly 2500 BCE, while beeswax residue in Anatolian pottery and cave art pushes human use of hive products back into the seventh to ninth millennium BCE. One reading holds these mark two independent origins rather than a single one.
Source Beekeeping (Wikipedia)
Cacao, Domestication RegionDisputed: upper Amazon (Ecuador) versus Central America
Cacao, Crops
Standing
Concerns Domestication Region
Currently States Disputed: upper Amazon (Ecuador) versus Central America
Genuinely disputed: one line of evidence places first domestication in the upper Amazon (Santa Ana-La Florida site, present-day Ecuador, Mayo-Chinchipe culture) with later introduction to Mesoamerica; a 2018 genomic study of cultivated trees instead concluded a single domestication event in Central America. See this wave's open question and dissent record for the full citation of both positions.
Source Cacao Tree (Wikipedia)
Cacao, Domesticated When (Circa)Disputed: at least 5,300 years ago, or about 3,600 years ago
Cacao, Crops
Standing
Concerns Domesticated When (Circa)
Currently States Disputed: at least 5,300 years ago, or about 3,600 years ago
Genuinely disputed: at least 5,300 years ago per the upper Amazon evidence, or about 3,600 years ago per the 2018 Central American single-domestication-event genomic study.
Source Cacao Tree (Wikipedia)
Cream Separator, DescriptionA machine that spins whole milk at high speed to divide it into cream and skim milk by centrifugal force, replacing the slow gravity settling of pans. Gustaf de Laval's 1878 patent, built with Oskar Lamm, made the process continuous rather than batch-fed and became the commercially dominant design, though earlier batch-process centrifugal separators already existed.
Cream Separator, Implements and Machines
Standing
Concerns Description
Currently States A machine that spins whole milk at high speed to divide it into cream and skim milk by centrifugal force, replacing the slow gravity settling of pans. Gustaf de Laval's 1878 patent, built with Oskar Lamm, made the process continuous rather than batch-fed and became the commercially dominant design, though earlier batch-process centrifugal separators already existed.
Gustaf de Laval's continuous centrifugal separator, patented in 1878 with Oskar Lamm, is popularly credited as the invention, but the German engineer Wilhelm Lefeldt had already built a spinning centrifugal separator earlier in the 1870s; de Laval's advantage was a continuous, non-stop feed rather than being the first working machine.
Source Gustaf de Laval, the Milk-Cream Separator (Tekniska Museet)
Desertification, DescriptionThe gradual degradation of fertile land into arid desert through some combination of natural climate variability and human land use such as overgrazing, deforestation and continuous unrotated tillage, with drylands covering some 40 percent of the world's land and home to more than two billion people. How much of any one region's desertification, the Sahel above all, is natural climate cycle versus human pressure is genuinely disputed rather than settled: since 1900 the Sahara has pushed roughly 250 kilometers further south across a 6,000-kilometer front, and the Sahel has lost around 650,000 square kilometers of productive land over the last fifty years, but satellite vegetation records since the 1980s also show partial regreening in wetter years, which does not sit easily beside a simple story of one-way human-driven collapse.
Desertification, Concepts
Standing
Concerns Description
Currently States The gradual degradation of fertile land into arid desert through some combination of natural climate variability and human land use such as overgrazing, deforestation and continuous unrotated tillage, with drylands covering some 40 percent of the world's land and home to more than two billion people. How much of any one region's desertification, the Sahel above all, is natural climate cycle versus human pressure is genuinely disputed rather than settled: since 1900 the Sahara has pushed roughly 250 kilometers further south across a 6,000-kilometer front, and the Sahel has lost around 650,000 square kilometers of productive land over the last fifty years, but satellite vegetation records since the 1980s also show partial regreening in wetter years, which does not sit easily beside a simple story of one-way human-driven collapse.
Climate-cycle and human-land-use explanations of Sahel desertification are both supported by parts of the record, and the relative weight of the two is not settled; see the paired open question on this entity for what would resolve it.
Source Desertification (Wikipedia)
Donkey, Domesticated When (Circa)circa 5000 to 3000 BC, debated
Donkey, Livestock
Standing
Concerns Domesticated When (Circa)
Currently States circa 5000 to 3000 BC, debated
Estimates from the archaeological and genetic record range from circa 5000 to 3000 BC; the exact center and date are still debated.
Source Donkey (Wikipedia)
Duck, Domesticated When (Circa)circa 2000 BC, debated
Duck, Livestock
Standing
Concerns Domesticated When (Circa)
Currently States circa 2000 BC, debated
Commonly dated to roughly the 2nd millennium BC in Southeast Asia; the exact date is not precisely fixed.
Source Duck (Wikipedia)
George Washington Carver, Birth Year1864
Hay Baler, DescriptionThe machine that compresses cut and raked hay, straw or silage into compact bales for handling and storage. A knotter-equipped stationary baler grew out of reaper technology in the 1870s; the pickup baler followed in the 1930s and the round baler reached mass production only in 1947, though a working round-bale press had already been built and patented decades earlier.
Hay Baler, Implements and Machines
Standing
Concerns Description
Currently States The machine that compresses cut and raked hay, straw or silage into compact bales for handling and storage. A knotter-equipped stationary baler grew out of reaper technology in the 1870s; the pickup baler followed in the 1930s and the round baler reached mass production only in 1947, though a working round-bale press had already been built and patented decades earlier.
Popular credit for the first round baler goes to Allis-Chalmers' 1947 Roto-Baler, but the Nebraska Luebben family had already built and refined a rolling round-bale press from 1892, patented by Ummo Luebben in 1910; Allis-Chalmers licensed and refined the Luebben design rather than inventing the mechanism outright.
Source Who Invented the Round Hay Baler? (Farm Collector)
Homestead Act of 1862, DescriptionThe law, signed by Abraham Lincoln, that granted 160 acres of surveyed public land to a settler who resided on and improved it, accelerating the settlement of the American West. About forty percent of those who filed a claim carried it through to a title; how much of the land granted under it went to genuine settlers rather than fraud and speculation is still argued.
Homestead Act of 1862, Milestones
Standing
Concerns Description
Currently States The law, signed by Abraham Lincoln, that granted 160 acres of surveyed public land to a settler who resided on and improved it, accelerating the settlement of the American West. About forty percent of those who filed a claim carried it through to a title; how much of the land granted under it went to genuine settlers rather than fraud and speculation is still argued.
About 40 percent of filers completed the process to final title; historians disagree on how much of the granted land reflects manipulation by land companies and speculators using dummy entrymen against ordinary settlers who simply failed. Earlier scholarship stressed widespread fraud, more recent work argues it was comparatively minor.
Source Homestead Acts (Wikipedia)
Horse Collar, Introduced Year480 CE
Horse Collar, Implements and Machines
Standing
Concerns Introduced Year
Currently States 480 CE
The earliest surviving depiction of the fully rigid, padded collar harness is a Dunhuang cave mural (cave 257) from Chinese Northern Wei art, dated 477 to 499 CE; the collar harness reached Europe by around 1000 CE and was common there by the 12th century. An earlier breast-strap trace harness, a precursor rather than the same device, is attested in China by the 4th century BCE, so whether the mural depicts a genuinely new invention or an older device finally captured in surviving art remains debated among historians of technology.
Source Horse Collar (Wikipedia)
Irish Potato Famine, DescriptionThe famine of 1845 to 1852, when the water mold Phytophthora infestans destroyed the potato crop Ireland's rural poor depended on; how much of the resulting mass death and emigration is attributable to the blight itself, as against the British government's response, remains debated.
Irish Potato Famine, Milestones
Standing
Concerns Description
Currently States The famine of 1845 to 1852, when the water mold Phytophthora infestans destroyed the potato crop Ireland's rural poor depended on; how much of the resulting mass death and emigration is attributable to the blight itself, as against the British government's response, remains debated.
Whether the death toll reflects the potato blight itself or was substantially worsened by British government policy (continued food exports, the limits of relief works and poor-law provision) is debated among historians; contemporaries such as John Mitchel held the government directly responsible.
Source Great Famine, Ireland (Wikipedia)
Plant Breeding, DescriptionThe deliberate improvement of crop plants, from a farmer keeping the best seed heads ten thousand years ago to the gene-level tools of today; the twentieth century's high-yield breeding drove the Green Revolution, whose costs to biodiversity and farmer independence are still debated.
Plant Breeding, Disciplines
Standing
Concerns Description
Currently States The deliberate improvement of crop plants, from a farmer keeping the best seed heads ten thousand years ago to the gene-level tools of today; the twentieth century's high-yield breeding drove the Green Revolution, whose costs to biodiversity and farmer independence are still debated.
Yield gains from Green Revolution breeding are undisputed, but assessments of its net benefit are debated: critics point to reduced crop biodiversity and deeper dependence on purchased seed and inputs.
Source Plant Breeding (Wikipedia)
Plough, Introduced Year3000 BCE
Plough, Implements and Machines
Standing
Concerns Introduced Year
Currently States 3000 BCE
Ard-plough evidence appears in the Near East as early as the sixth millennium BCE; the earliest known European wooden ard, at Lavagnone in Italy, dates to around 2300 to 2000 BCE, though scratch marks consistent with early ploughing there date to 3500 to 3000 BCE. 3000 BCE is used here as the conventional circa marker, consistent with this entity's own origin-note; the precise origin point and date remain debated among archaeologists.
Source Ard (plough) (Wikipedia)
Repeal of the Corn Laws, DescriptionThe 1846 repeal, under Prime Minister Robert Peel, of the tariffs that had protected British grain since 1815. It ended decades of Anti-Corn Law League agitation and split the Conservative Party; how much credit belongs to that agitation, to Peel's own economic convictions, and to the shock of the Irish potato failure remains argued.
Repeal of the Corn Laws, Milestones
Standing
Concerns Description
Currently States The 1846 repeal, under Prime Minister Robert Peel, of the tariffs that had protected British grain since 1815. It ended decades of Anti-Corn Law League agitation and split the Conservative Party; how much credit belongs to that agitation, to Peel's own economic convictions, and to the shock of the Irish potato failure remains argued.
Historians divide over whether Peel's own conversion to free-trade economics or the emergency of the Irish potato failure was the decisive force behind repeal; both accounts are argued by serious scholarship.
Source Corn Laws (Wikipedia)
Rye, Domestication RegionDisputed: possibly Euphrates valley, northern Syria; securely established as an independent crop in central Europe
Rye, Crops
Standing
Concerns Domestication Region
Currently States Disputed: possibly Euphrates valley, northern Syria; securely established as an independent crop in central Europe
A disputed early claim places systematic cultivation in the Euphrates valley of northern Syria; the securely dated record instead shows independent cultivation established in central Europe.
Source Rye (Wikipedia)
Scythe, OriginThe scythe's own origin is unresolved and the sources disagree by a wide margin: some trace it to Cucuteni-Trypillia settlements as early as circa 7000 BC, others place the first practical harvesting scythe around 500 BC in the Iron Age; no securely identified Roman-era scythe survives despite roughly 10,000 Roman sickles held in European museum collections. It had replaced the sickle for reaping crops in most of Europe by the 16th century, becoming widespread there only from the Carolingian era (8th century AD) onward, and was itself displaced by horse-drawn and tractor mowing machinery.
Scythe, Implements and Machines
Standing
Concerns Origin
Currently States The scythe's own origin is unresolved and the sources disagree by a wide margin: some trace it to Cucuteni-Trypillia settlements as early as circa 7000 BC, others place the first practical harvesting scythe around 500 BC in the Iron Age; no securely identified Roman-era scythe survives despite roughly 10,000 Roman sickles held in European museum collections. It had replaced the sickle for reaping crops in most of Europe by the 16th century, becoming widespread there only from the Carolingian era (8th century AD) onward, and was itself displaced by horse-drawn and tractor mowing machinery.
Source Scythe (Wikipedia)
Sericulture, Central QuestionChinese tradition credits the legendary Empress Leizu with discovering silk cultivation around 2700 BCE by finding a cocoon in her tea, but the practice's true origin is unresolved.
Sericulture, Disciplines
Standing
Concerns Central Question
Currently States Chinese tradition credits the legendary Empress Leizu with discovering silk cultivation around 2700 BCE by finding a cocoon in her tea, but the practice's true origin is unresolved.
The 2700 BCE Leizu account is a much later literary tradition; the oldest hard evidence, a carved ivory silkworm figure from Nancun in Hebei and silk residues at other Neolithic sites, is dated to roughly 5,400 to 5,500 years ago, centuries before any written record, so archaeologists and textual historians disagree on how much weight the legendary account deserves. See the paired open question on this entity for what would resolve it.
Source Sericulture (Wikipedia)
Sickle, Introduced Year10000 BCE
Sickle, Implements and Machines
Standing
Concerns Introduced Year
Currently States 10000 BCE
Flint sickle blades with cereal-harvesting gloss are widely attested in the Natufian culture by circa 10000 BCE, matching this entity's own origin-note; composite harvesting tools existed earlier without attestation as a farming implement proper (use-wear evidence at Ohalo II is dated far earlier, on wild rather than domesticated cereals), and the precise point at which the sickle became an agricultural rather than a foraging tool remains debated among archaeologists.
Source Sickle (Wikipedia)
Sustainable Agriculture, Origin Year1980
Sustainable Agriculture, Concepts
Standing
Concerns Origin Year
Currently States 1980
No single coiner is attested. Wes Jackson's New Roots for Agriculture (1980) is among the earliest prominent uses of the phrase in print; the term spread through US policy and research circles across the 1980s.
Source Sustainable Agriculture (Wikipedia)