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Eli Whitney invented the cotton gin to transform cotton to a usable product by removing the cottonseed from the cotton fiber.
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Thomas Jefferson inventor of first iron plow.
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Cyrus McCormick invented the Grain Reaper to save labor in cutting, weat, oats, and similar crops.
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Henry Blair
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John Deere improved the iron plow by inventing the steel moldboard plow.
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Edmund Quincey
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Joseph Glidden dramatically changed raising livestock. Barbed wire tatoos came much later.
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Anna Baldwin changed the dairy industry by inventing a machine to replace hand milking.
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Thomas Elkins designed a device that helped with the task of preserving perishable foods by way of refrigeration.
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George Washington Carver developed crop rotations and the use of legumes (plants that "make" their own nitrogen, ie, peanuts) to significantaly improve soil fertility in the U.S. south.
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Ben Holt invented the tractor which came to replace the mule as the sources of power (horse power)
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John Sanford developed a devicefor injecting cells with genetic information.
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Tractor based GPS systems together with sophisticated GIS (Geographic Infromation Systems) uses a wide variety of techniques to gather data such things as intensity planting, application fertilizer and pestisides, watering schedules, etc.
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First used in Ontario, Canada. Many benefits one of which is reduction in labor. Initial cost is primary disadventage especially to small producer.