Northeast Research and Demonstration Farm
Soybean planting date studies of various types have been conducted at the Nashua site since 1976. Earlier tests studied later planting dates (May through mid-June), differing maturity varieties, and soybeans planted with and without starter fertilizer and Ridomil fungicide soil treatments. Research reports on these studies can be found in previous annual progress reports and all were summarized in the 2001 report.
Iowa State University
Pecinovsky, Kenneth T. and Benson, Garren O., "Soybean Planting Date Studies" (2005). Iowa State Research Farm Progress Reports. 1231.