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Many Wisconsin farmers use center-pivot irrigation systems, which can apply the exact amount of water their crops need. Most farmers are efficient, but the number of irrigation wells continues to climb as the practice spreads across the state. Photo: Kate Golden/Wisconsin Center for Investigative Journalism

Many Wisconsin farmers use center-pivot irrigation systems, which can apply the exact amount of water their crops need. Most farmers are efficient, but the number of irrigation wells continues to climb as the practice spreads across the state. Photo: Kate Golden/Wisconsin Center for Investigative Journalism