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Beneficial System Outcomes in Organic Fields at the Long-Term Agroecological Research (LTAR) Site, Greenfield, Iowa, USA

Delate, Dr. Kathleen; Cambardella, Dr. Cindy; Chase, Dr. Craig and Turnbull, Robert (2008) Beneficial System Outcomes in Organic Fields at the Long-Term Agroecological Research (LTAR) Site, Greenfield, Iowa, USA. Poster at: Cultivating the Future Based on Science: 2nd Conference of the International Society of Organic Agriculture Research ISOFAR, Modena, Italy, June 18-20, 2008.

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In 1997, Iowa State University established the first U.S. Land Grant University permanent faculty position in organic agriculture to assist farmers in the rapid expansion of organic production in that state. Research agendas, developed in consultation with organic farmers and processors, led to the establishment of the Neely-Kinyon Long-Term Agroecological Research (LTAR) site in Greenfield, Iowa, in 1998 to study the long-term effects of organic production in terms of yield and economic performance, in addition to other system effects. Over nine years of comparison, there was no significant difference in corn or soybean yields in the organic and conventional systems. Organic corn yields in the longest rotation (C-S-O/A-A) over a 9–yr period were 9914 kg/ha compared to 10113 kg/ha in the conventional system and organic soybeans in the same rotation yielded 3043 kg/ha while conventional yields averaged 2906 kg/ha. Soil quality remains high in the organic system, with soil organic carbon and mineralizable nitrogen greater in the organic rotations relative to conventional, demonstrating greater C sequestration potential and N-use efficiency in the organic system. Over nine years, revenues generated from organic corn crops increased average revenues by a factor of 1.67 over conventional corn, while organic soybean revenues were 2.32 times greater than conventional soybean revenues.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:Crop rotations, soil quality, corn, soybean, economics
Subjects: Soil > Soil quality
Farming Systems > Farm economics
Research affiliation: International Conferences > 2008: IFOAM OWC: Research Track / ISOFAR > 1.1 Interactions Production - Environment
Deposited By: Turnbull, Bob
ID Code:12441
Deposited On:25 Sep 2008
Last Modified:12 Apr 2010 07:36
Document Language:English
Refereed:Peer-reviewed and accepted
Additional Publishing Information:This paper is published in the conference proceedings:
Neuhoff, Daniel; Halberg, Niels; Alfldi, Thomas; Lockeretz, William; Thommen, Andreas; Rasmussen, Ilse A.; Hermansen, John; Vaarst, Mette; Lck, Lorna; Carporali, Fabio; Jensen, Henning Hgh; Migliorini, Paola and Willer, Helga, Eds. (2008) .Cultivating the Future Based on Science. Proceedings of the Second Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR), held at the 16th IFOAM Organic World Congress in Cooperation with the International Federation of Organic Agriculture Movements (IFOAM) and the Consorzio ModenaBio, 18 . 20 June 2008 in Modena, Italy.. International Society of Organic Agriculture Research (ISOFAR), c/o IOL, DE-Bonn, Research Institute of Organic Agriculture FiBL, CH-Frick. http://orgprints.org/13672 and http://orgprints.org/13674

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