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Farmers experiment with gypsum to reduce water pollution

“Here in a heartland of U.S. agriculture, a growing number of farmers are spraying manure produced by animal feeding operations–which can raise thousands of animals on relatively small plots land–across vast swaths of cropland. The phosphorus and nitrogen in the dung help fertilize crops. But when the nutrients wash into waterways, they can spur algal booms that ultimately suffocate aquatic ecosystems.” Click here to read more.