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As long as agricultural wages were relatively low, large farmers found it more efficient to maintain a tractor and truck along with some horses. Horses did virtually all the jobs for which power was not the overriding input. Each power source specialized in the tasks for which it had the greatest comparative advantage.

For other machines, the explosive growth of the postwar period must be understood as a response to unprecedented rates of growth in agricultural wages. This section therefore concludes with two generalizations. Generalization 16. Where cost advantages are large or change rapidly, individual operations are mechanized very quickly.

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Tillage is the manipulation of the soil into a desired condition by mechanical means; tools are employed to achieve some desired effect (such as pulverization, cutting, or movement). Soil is tilled to change its structure, to kill weeds, and to manage crop residues.

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Another interesting development pioneered in France is the robotic approach to harvesting tree fruit like apples and oranges where the mature fruit is selected by machine vision using light reflectance, picked mechanically by the robot and conveyed pneumatically (under vacuum) to a storage pallet. Whether these exciting but expensive technologies can be successfully commercialized remains to be seen. Gantry mechanization (including harvesting) of fruits and vegetables in greenhouses has also been investigated but cost remains a difficult factor to overcome.

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