Steam traction engines and threshing machines were too expensive for one farm, so crews traveled farm to farm each autumn, threshing the neighborhood's grain in a communal ritual of shared labor and enormous meals that rural memoirs across North America and Europe recall vividly. The combine harvester, which reaps and threshes in a single pass, dissolved the trade — and with it one of the countryside's great social institutions — by the 1950s.
Itinerant threshing crew已不复存在。这里整理是什么消灭了它，以及哪个职业接手了那份工作。
1700 – 1900
The Agricultural Revolution and the world grain trade
Britain's agricultural revolution — Tull's seed drill, the Norfolk four-course rotation, Bakewell's selective livestock breeding and the enclosure of the open fields — roughly doubled yields and freed the labor that fed the Industrial Revolution's factories. Railways, steamships and the McCormick reaper then opened the American prairies, the Argentine pampas and the Russian steppe to export grain, ruining and remaking farmers across whole continents as world prices reached every village.
当时还发生了什么
1834
McCormick patents the mechanical reaper
Cyrus McCormick patents a horse-drawn reaper that cuts grain many times faster than a laborer with a scythe, first demonstrated in Virginia in 1831. Harvest — the great labor bottleneck that had set the size of every farm since the Neolithic — begins its long surrender to machinery.
1892
Froelich runs the first gasoline tractor
In Clayton County, Iowa, John Froelich builds the first gasoline-powered tractor that can drive both forward and backward, and uses it to power a threshing run that season. His Waterloo company's engine business is bought by John Deere in 1918, founding the tractor line that helps retire tens of millions of draft horses.
1909–1913
Haber–Bosch synthesizes nitrogen fertilizer
Fritz Haber demonstrates ammonia synthesis from air in 1909, and Carl Bosch industrializes it at BASF's Oppau plant by 1913. Synthetic nitrogen removes the oldest ceiling on crop yields; by common estimates, roughly half of the people alive today are fed by crops grown with it.
1944–1970
The Green Revolution
Norman Borlaug's semi-dwarf, disease-resistant wheat, bred in Mexico from 1944, and IRRI's IR8 rice transform yields across Mexico, India, Pakistan and the Philippines; India's wheat harvest nearly doubles between 1965 and 1970. Borlaug receives the 1970 Nobel Peace Prize — the only one ever awarded chiefly for plant breeding.
那份工作如今在哪里
The profession that made every other one possible — feeding the world for eleven millennia, from the first Fertile Crescent wheat to autonomous tractors.
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