Organic Farming Practices Improve Water Quality in Minnesota

A team of University of Minnesota scientists studied the impact of organic and sustainable agricultural practices over three years on subsurface drainage and water quality in southwestern Minnesota. Their focus was on corn-soybean farms.

They found that organic and sustainable systems reduced the volume of subsurface drainage water discharges by 41 percent - a major benefit for the farmer, especially in dry years when lack of soil moisture cuts back yields. Organic and sustainable systems also reduced the loss of nitrate nitrogen by about 60 percent, allowing farmers to reduce fertilization rates by nearly half without sacrificing yields in most years. The improved soil quality on the organic/sustainable plots, coupled with more diverse land use patterns, were credited by the team with improving the efficiency of nutrient uptake and water infiltration and use, especially in average to wet years.

 

The full text of the University of Minnesota study is available free of charge.

 

The OACC wishes to thank "The Organic Center" of the USA for permission to reproduce this article on our website.

 

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Posted August 2007