Impact of swine manure application timing on drainage water quality– 2016 results
August 15, 2017 by Brian Dougherty Iowa State University
August 15, 2017, Ames, IA – A three-year study, starting in 2016, at the Northeast Research and Demonstration Farm in Nashua, IA, began evaluating the impacts of various cropping and nutrient management systems on nitrogen and phosphorus loss through subsurface tile drainage.
This is particularly interesting to livestock producers regarding the impacts of swine manure application timing on drainage water quality.
The study allows for comparisons between early fall manure application (soil temperatures above 50°F) with and without a cereal rye cover crop and late fall manure applications (soil temperatures below 50°F).
Late fall manure with and without a nitrification inhibitor is also being compared to spring manure application. Results from this study will give producers valuable information regarding the water quality impacts of different manure management practices.