Iowa is considering banning manure as a soybean fertilizer. The Iowa Environmental Protection Commission contends that adding manure to soybean crops causes an overflow of nitrogen to the fields and poses a water-contamination risk.

The proposal is part of a long-term discussion about whether nitrogen-rich liquid manure should be applied to soybean fields. Some scientists contend that soybeans don’t need the added nitrogen because soybeans convert nitrogen from the air or the nitrogen that already exists in the ground.

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