Such machinery has facilitated the full or partial replacement of human- and animal-powered equipment in developed countries and increasingly in developing countries as well. The net result has been higher productivity and the welcome elimination of much of the drudgery of manual farm labor. For example, one person involved in agricultural production can now provide enough food and fiber for 128 others whereas only a century ago one person could provide food and fiber for only eight others (see also, Technology and Power in Agriculture).
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.

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Such machinery has facilitated the full or partial replacement of human- and animal-powered equipment in developed countries and increasingly in developing countries as well. The net result has been higher productivity and the welcome elimination of much of the drudgery of manual farm labor. For example, one person involved in agricultural production can now provide enough food and fiber for 128 others whereas only a century ago one person could provide food and fiber for only eight others (see also, Technology and Power in Agriculture).
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.

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