tractor
| In agriculture, a powerful motor vehicle, commonly having large rear wheels or caterpillar tracks, used for pulling farm machinery and loads. It is usually powered by a diesel engine and has a power-takeoff mechanism for driving machinery, and a hydraulic lift for raising and lowering implements. |
| The average weight of tractors in developed countries has tripled over the period 1970–1998. This increase in size is actually detrimental to crop yield as compacted soil is less fertile. |
| Japanese researchers have developed (1998) a tractor that tills, seeds, and fertilizes fields without needing a driver. It uses global positioning satellites to navigate and has an error margin of less than 10 cm/4 in. |
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