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102 SEEDWORLD.COM DECEMBER 2015 RESEARCH SHOWCASE Welcome to Seed Worlds Research Showcase a new department within the magazine. This department is designed to bring more scientific information to readers as well as showcase the work being done by graduate students and their advisors. Think Twice Before Replanting Soybeans Adam P. Gaspar Shawn P. Conley John M. Gaska Deptartment of Agronomy University of Wisconsin-Madison Introduction Soybean planting date trends have steadily shifted earlier within the Northern Corn Belt while inclement weather insect pressure and disease pressure associated with spring planting can require replanting some years USDA-NASS 2011. Furthermore recent studies have reported sim- ilar yields among reduced plant stands due to the soybean plants compensatory ability Carpenter and Board 1997 and diminished yield potential of replanted or essentially later planted soybeans Conley et al. 2012 De Bruin and Pedersen 2008. Ultimately producers would like to know the potential yield gain or loss from replanting sub-optimal plant stands to help determine if replanting is economical. Therefore the objectives of this study were to Determine the threshold for replanting soybean stands. Evaluate replanting options. Quantify the effect of seed treatments and planting date on replant decisions. This study was conducted in 2012 and 2013 at the Arlington Agricultural Research Station Arlington Wis. Twelve different replant scenarios were planted in 15-inch rows during early May late May and mid-June. The replanted portions of the plots were interseeded between the rows of the initial soybean stand. ApronMaxx RFC and CruiserMaxx Syngenta Crop Protection seed treatments were used to compare a fungicide only seed treatment with one that also contains an insecticide. Determine the Initial Plant Stand The first step in making an informed replant decision is determining the initial plant stand. Soybean stands can be deceiving to the eye sometimes especially in narrow rows