1920s
1920
Of gainfully employed persons, 27 percent were engaged in agriculture.
Soil classification system
developed.(more)
American Farm Bureau
Federation formally organized.
Warner-Bratzler shear instrument developed
to objectively measure meat tenderness.
1921
Field of population genetics in animal
breeding founded.
1922
Capper-Volstead Act provided legal status for agricultural cooperatives.
Honeybee Act prohibited the importation of adult
honeybees.
Developed a method for dusting cotton fields
with calcium arsenate to protect cotton against boll weevil.(more)
1923
Tobacco mosaic virus isolated;
established that viruses cause many plant diseases.
First annual farm outlook conference held.
Congressional distribution of seeds discontinued.
Commercial hybrid seed corn
developed. (more)
1924
Magness-Taylor pressure tester invented to measure fruit ripeness.
First planes designed specifically for crop-dusting
operations in the Mississippi Delta.
President Coolidge appointed a nine-man President's
agricultural conference.
1925
Tennessee outlawed teaching evolution in school; Scopes trial held in Dayton,
TN.
Clarence Birdseye pioneered quick-freezing and frozen
food. (more)
Three to 4 man-hours of labor required on 1 acre to produce
20 bushels of wheat.
Discovered that ethylene is the agent
responsible for initiating fruit coloring in oranges.
Purnell Act authorized funds for research by agricultural
experiment stations on economic and social problems of agriculture.
1926
USDA began inspection of live poultry.
Successful light gasoline tractor invented.
First auxin, a plant hormone, discovered.
Targhee breed of sheep developed.
1927
U.S. National
Arboretum established by Congress.
Federal beef grading initiated.
USDA conducted tests on methods for removing
lead-arsenate spray residues from apples and pears to meet export
tolerances.
1928
Bouquets carried on Graf Zeppelin's first transatlantic flight showed the role
air travel could play in transporting insect pests and plant diseases.
(more)
Antibacterial properties of penicillin discovered by Sir
Alexander Fleming. (more)
Soil erosion identified as serious threat to
agricultural productivity. (more)
Capper-Ketcham Act provided extension work in agriculture
and home economics for men, women, boys, and girls.
Buchanan Amendment provided first Congressional
appropriation for soil erosion research by USDA. (more)
Wool Standards Act passed.
Future Farmers of America established.
Method developed for obtaining auxin.
Jersey highbush blueberry released.
Ten regional erosion experiment stations set up.
1929
Great Depression began.
Growing plants in water, hydroponics, invented.
Mediterranean fruit fly discovered in Florida.
First airplane seeding of rice in California.
Showed that plants first inoculated with one
virus are protected from infection of another closely related virus or a mild
strain of the same virus, known as 'cross protection.’
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