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Compost filter socks improve runoff from croplands
Date:6/20/2010

tions of surface-applied nutrients and herbicides that can be readily dissolved and transported in runoff.

Similarly, conservation buffers, such as filter strips, riparian forest buffers, and grassed waterways, can further reduce chemical and nutrient transport as runoff moves from crop fields to streams. They are also generally more effective in retaining sediment than dissolved chemicals and work best when runoff is uniformly distributed across the entire area of the buffer.

Unfortunately, uniform distribution is often difficult to achieve and maintain due to soil and topographic conditions. Runoff can naturally concentrate in small areas as it passes through buffers. In fact, the USDA-NRCS has referred to concentrated flow as the 'nemesis' of pesticide trapping in conservation buffers.

This study demonstrates that filter socks can enhance the effectiveness of grassed waterways in reducing sediment transport. Investigations in which materials will be mixed with the compost to improve the removal of nutrients and herbicides are being conducted in collaboration with filter sock manufacturer Filtrexx International, LLC. If these results are promising, filter socks may become another tool that can be used by farmers and conservationists to reduce the impact of crop production on surface water quality.


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Contact: Sara Uttech
suttech@sciencesocieties.org
608-268-4948
American Society of Agronomy
Source:Eurekalert

Page: 1 2

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