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Cambridge-area farmer Dave Hughes adjusts his touch-screen GPS unit while spraying fertilizer on one of his soybean fields. The unit shows Hughes' areas of the soybean field where he's already sprayed fertilizer and where to go next. Dave Hughes' touch-screen GPS unit shows him areas of the soybean field where he's already sprayed fertilizer and where to go next. Charles Crave stands among the calves at the Crave Brothers Farm, site of Wisconsin Farm Technology Days.  
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