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Title:   Author  item
                                            Weyers, Sharonitem
                                            Archer, Daviditem
                                            Johnson, Janeitem
                                            Wilts, Alanitem
                                            Barbour, Nancyitem
                                            Eklund, James
  Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 11/6/2005
                                    Publication  Date: 11/6/2005
                                    Citation: Lachnicht Weyers, S.L., Archer, D.W., Johnson, J.M., Wilts, A.R., Barbour, N.W., Eklund, J.J. 2005. Microbial dynamics in conventional and organic managed systems [abstract][CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. ASA-CSSA-SSSA Annual Meeting. Nov. 6-10, 2005, Salt Lake City, UT.Interpretive Summary:
                                Technical Abstract: A large-scale systems study on conventional and organic management systems was established. Two year vs. four year crop rotations (corn-soybean, corn-soybean-wheat-alfalfa), inorganic vs. organic fertilizer sources, and conventional vs. strip tillage management practices were compared. Soil samples to a 10-cm depth were taken in the spring over four years from plot establishment. Microbial biomass C and N was determined by chloroform fumigation-direct extraction. Fatty acid methyl esters (FAME) were extracted from freeze-dried soil and exhibited mostly differences in quantity rather than quality. Microbial C changed yearly, with little treatment effects. Microbial N showed differences related to crop rotation. Minimal differences among treatments were expected for the initial years of the study.


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