Full Title: Corn Stover Nutrient Removal Estimates for Central Iowa
Author(s): Douglas L. Karlen, John L. Kovar and Stuart J. Birrell
Publisher(s): USDA-Agricultural Research Service (ARS), National Laboratory for Agriculture and the Environment; BioSystems and Agricultural Engineering Department, Iowa State University
Publication Date: 6/2014

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One of the most frequently asked questions Project Liberty coordinators receive is “what quantity of nutrients will be removed if I harvest my corn (Zea mays L.) stover?” This report summarizes plant nutrient composition data collected in Boone and Palo Alto Counties of Iowa from 2008 through 2012 to help answer that question. More than 500 site-years of samples were collected by hand from approximately six linear feet of row and divided into four plant fractions: vegetative material from the ear shank upward, vegetative material from approximately four inches above the soil surface to just below the ear, cobs, and grain. Another 388 stover samples, representing the vegetative material collected directly from a single-pass combine harvesting system or from bales that had been prepared using two-pass stover harvest technologies were also collected.