Position control is a system whereby the position of a fully mounted implement (sprayer or fertilizer distributor, whose weight is completely supported by the tractor) is automatically maintained in a constant position (e.g. operating height over the ground) despite leakages in the hydraulic system tending to lower the position of the implement.
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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Position control is a system whereby the position of a fully mounted implement (sprayer or fertilizer distributor, whose weight is completely supported by the tractor) is automatically maintained in a constant position (e.g. operating height over the ground) despite leakages in the hydraulic system tending to lower the position of the implement.
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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