Farmers of Forty Centuries
Encyclopedia
In 1909, American agronomist
Agronomist
An agronomist is a scientist who specializes in agronomy, which is the science of utilizing plants for food, fuel, feed, and fiber. An agronomist is an expert in agricultural and allied sciences, with the exception veterinary sciences.Agronomists deal with interactions between plants, soils, and...

 F.H. King toured China
China
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

, Korea
Korea
Korea ) is an East Asian geographic region that is currently divided into two separate sovereign states — North Korea and South Korea. Located on the Korean Peninsula, Korea is bordered by the People's Republic of China to the northwest, Russia to the northeast, and is separated from Japan to the...

 and Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

, studying traditional fertilization, tillage
Tillage
Tillage is the agricultural preparation of the soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shovelling, picking, mattock work, hoeing, and raking...

 and general farming practices. He wrote his observations and findings in Farmers of Forty Centuries, Or Permanent Agriculture in China, Korea, and Japan (1911, published shortly after his death by his wife, Carrie Baker King; numerous facsimile reprintings, including Courier Dover Publications, ISBN 0-486-43609-8, and Rodale Press, ISBN 0-87857-867-6). King lived in an era preceding synthetic nitrogen fertilizer production and before the use of the internal combustion engine for farm machinery, yet he was profoundly interested in the challenge of farming the same soils in a 'permanent' manner, hence his interest in the agricultural practices of ancient cultures. In recent years, his book became an important organic farming
Organic farming
Organic farming is the form of agriculture that relies on techniques such as crop rotation, green manure, compost and biological pest control to maintain soil productivity and control pests on a farm...

reference.

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