July 21, 2009
Scientists study manure on tiled fields
Amounts of carbon discharged from manure spread on tiled fields is about the same as other sources of fertilizer, Purdue University scientists in Indiana said.
Tiles set beneath farm fields direct excess water from the soil into streams. It was traditionally believed tiles flush manure into water systems more quickly, increasing the growth of bacteria, such as E.coli, which consume the dissolved carbon found in effluent, Purdue agronomists Ron Turco and Sylvie Brouder said.
It was surprising in a way that carbon loads were relatively low at the discharge points, Brouder said.
The assumption was that manure was adding significantly.
Future studies are to evaluate how antibiotics and hormones from manure are transferred to streams through tiled fields, the researchers said.