In the early 19th century, animals were the chief source of power in farming. Later in the century, steam power gained in importance. During World War I gasoline- (petrol-) powered tractors became common, and diesel engines later became prevalent. In the developed countries, the number of farm workers has steadily declined in the 20th century, while farm production has increased because of the use of machinery.
Sophisticated hydraulic systems are now available on all modern tractors capable of performing additional functions including the operation and control of a multiplicity of implements and machines mounted to the rear, front or side of the tractor including loaders, mowers, agrochemical applicators, harvesters and feeders. While many of these are mechanically driven through the power-take-off (PTO) shaft at the rear of the tractor, hydraulic-drive systems provide additional flexibility due to the flexible power hoses that interconnect the driving and driven units.

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In the early 19th century, animals were the chief source of power in farming. Later in the century, steam power gained in importance. During World War I gasoline- (petrol-) powered tractors became common, and diesel engines later became prevalent. In the developed countries, the number of farm workers has steadily declined in the 20th century, while farm production has increased because of the use of machinery.
Sophisticated hydraulic systems are now available on all modern tractors capable of performing additional functions including the operation and control of a multiplicity of implements and machines mounted to the rear, front or side of the tractor including loaders, mowers, agrochemical applicators, harvesters and feeders. While many of these are mechanically driven through the power-take-off (PTO) shaft at the rear of the tractor, hydraulic-drive systems provide additional flexibility due to the flexible power hoses that interconnect the driving and driven units.

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