Agricultural and Biosystems Engineering Conference Proceedings and Presentations Agricultural and Biosystems Engineering 11-7-2013 Swine Manure & Aqua-ammonia Nitrogen Application Timing on Subsurface Drainage Water Mathew J. Helmers Iowa State University, mhelmers@iastate.edu Xiaobo Zhou Iowa State University Carl H. Pederson Iowa State University, carl@iastate.edu Follow this and additional works at: htp://lib.dr.iastate.edu/abe_eng_conf Part of the Agriculture Commons , and the Bioresource and Agricultural Engineering Commons Te complete bibliographic information for this item can be found at htp://lib.dr.iastate.edu/ abe_eng_conf/374. For information on how to cite this item, please visit htp://lib.dr.iastate.edu/ howtocite.html. Tis Conference Proceeding is brought to you for free and open access by the Agricultural and Biosystems Engineering at Iowa State University Digital Repository. It has been accepted for inclusion in Agricultural and Biosystems Engineering Conference Proceedings and Presentations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact digirep@iastate.edu.