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Wheat farms are most efficient when they comprise some thousands of hectares and can be worked by teams of people and machines.

Australian sheep stations and other livestock farms must be large to provide grazing for thousands of animals.

The dates of domesticated plants and animals vary with the regions, but most predate the 6th millennium bc, and the earliest may date from 10,000 bc.

Scientists have carried out carbon-14 testing of animal and plant remains and have dated finds of domesticated sheep at 9000 bc in northern Iraq; cattle in the 6th millennium bc in northeastern Iran; goats at 8000 bc in central Iran; pigs at 8000 bc in Thailand and 7000 bc in Thessaly; onagers, or asses, at 7000 bc in Jarmo, Iraq; and horses at 4350 bc in Ukraine.

S., Canada, and some of the Western European countries.

Because nations depend on agriculture not only for food but for national income and raw materials for industry as well, trade in agriculture is a constant international concern.

The importance of an individual country as an exporter of agricultural products depends on many variables.

Among them is the possibility that the country is too little developed industrially to produce manufactured goods in sufficient quantity or technical sophistication.

Radio and television disseminate vital weather reports and other information that is of concern to farmers.

Mechanization, the outstanding characteristic of late 19th and 20th-century agriculture, has eased much of the backbreaking toil of the farmer.

More significantly, mechanization has enormously increased farm efficiency and productivity.

Nearly 50 percent of the world's labor force is employed in agriculture. In Asia the figure was 61 percent; in South America, 24 percent; in Eastern Europe and the Soviet Union, 15 percent, and in Western Europe, 7 percent. In the late 1980s, the average for Canadian farms was about 230 ha (about 570 acres) per farm; for U. The latifundia of Latin America are large, privately owned estates worked by tenant labor.

The distribution in the late 1980s ranged from 64 percent of the economically active population in Africa to less than 4 percent in the U. Single-crop plantations produce tea, rubber, and cocoa.

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