The size and number of tractors is dictated by the size, nature and profitability of the farming enterprise as well as by how many (if any) operations (e.g. plowing, planting, spraying, harvesting) will be serviced by local contractors. For example, the capital cost of purchasing a harvester to harvest a small area of a moderate value crop is often prohibitive.
Furthermore, the development of sub-soilers to break up soil pans (highly compacted layers of soil interfering with water movement and deep crop root development) would not have been possible without the power capability of the modern tractor. Likewise, the ability to improve soil drainage (in excessively high moisture soils) through tractorized mole drainage systems would not have been possible with animal power alone.

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The size and number of tractors is dictated by the size, nature and profitability of the farming enterprise as well as by how many (if any) operations (e.g. plowing, planting, spraying, harvesting) will be serviced by local contractors. For example, the capital cost of purchasing a harvester to harvest a small area of a moderate value crop is often prohibitive.
Furthermore, the development of sub-soilers to break up soil pans (highly compacted layers of soil interfering with water movement and deep crop root development) would not have been possible without the power capability of the modern tractor. Likewise, the ability to improve soil drainage (in excessively high moisture soils) through tractorized mole drainage systems would not have been possible with animal power alone.

Source 1 | Source 2 | Source 3

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