Here is an interesting article I came across from the USDA Agricultural Research Service. In the Midwest scientists are looking at using woodchips to remove excess nitrogen from water that runs off agricultural fields. They are finding that woodchips placed in drainage tiles provide a great home for denitrifying bacteria which removed a large portion of unused nitrogen that would find its way into surface waters and eventually into the Mississippi waterway and out into the Gulf of Mexico. There might be a use for this in those ditches that return water to your farm pond. Here is the the rest of the article.
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