The state's efforts to ban the practice - and farmers' pledges to avoid a ban - go back a decade.
Another showdown looms over Iowa's regulations governing farmers' ability to spread manure on frozen or snow-covered fields.
Livestock interests are pushing legislation that would effectively lift the winter ban on applying manure, said Wayne Gieselman, the state's environmental protection chief.
State environmental regulators vow to fight to retain the ban on spreading manure in the winter because they say the practice can lead to dangerous ammonia levels in streams.
Eldon McAfee, a lawyer for livestock interests, contends the new legislation is needed. He said a proposed rule drafted by Iowa's Department of Natural Resources would force some farmers to add expensive manure storage without much warning.
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