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Fargo, ND 58108, USA d Department of Crop and Soil Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA a r t i c l e i n f o Article history: Received 23 April 2013 Received in revised form 26 June 2013 Accepted 30 June 2013 Available online 11 July 2013 Keywords: Aggre...