According to The Times-News in Twin Falls, Idaho, soil testing in Gooding County found that 97 of 110 fields tested for phosphorus levels exceed the recommended limit of 40 parts per million in the top foot of topsoil.

More than half of the fields tested had readings above 100 ppm. And almost 40 percent of the fields had readings about 150 ppm or higher. The Idaho Department of Agriculture has sent warning letters to 12 dairies that operate those fields.

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The Times-News