SHOREWOOD, Minn. (AP) — The Minnesota Department of Natural Resources says its contractor has delayed work to kill zebra mussels in a small Minneapolis-area lake.

The agency and its contractor will inject potash under the ice of Christmas Lake on Friday instead of Tuesday.

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Officials say it’s the first time potash has been used for this purpose in Minnesota and only the third time in the U.S.

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Potash is a potassium compound often used in agriculture and industry. The DNR says if the application succeeds, it will be the first time zebra mussels have been eradicated from a Minnesota lake.

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