ing a more informed seed treatment decision before planting. Also, since seed cost and associated technology The effects of fungicide seed treatments on seeding rate, location, fees have made seed cost a greater percentage of opsimulated rainfall at emergence, time of planting, and seed quality erating costs (Lambert and Lowenberg-DeBoer, 2003), were analyzed for soybean [Glycine max (L.) Merr.] in this study. Variation in plant emergence allowed estimation of economically analyses surrounding seeding rate and replanting decioptimal seeding rates and partial returns (PR ϭ Gross revenue Ϫ sions for soybean are becoming more important to pro-Seed cost) across seed treatment options. Study results proved a single ducers. seed treatment to be superior across most study conditions. In fact, In this study the effects of four different seed treata comparison of optimally treated to untreated seed revealed that a ments: Fludioxonil (Maxim), Carboxin-Tetramethylthiseemingly insignificant input in terms of cost (Ͻ$8.65 ha Ϫ1 ) enhanced uram disulfide-Metalaxyl (Stiletto), Metalaxyl (Alleprofitability by an average of $43.71 ha Ϫ1 in this study. Using high giance), and Carboxin ϩ PCNB (Vitavax ϩ PCNB) rather than low quality treated seed increased producer returns by were compared with a control with no seed treatment. 1 an average of $64.27 ha Ϫ1 . Seeding rate recommendations need to be viewed with the precaution that added seed may be low cost insurance This allowed for the assessment of the importance of against lesser-than-expected survival rates. For the cultivar Hutcheson different pathogens based on the fungicides applied to (MG V), planting in May compared with April and June provided seed (for example, Allegiance targets Pythium spp., better yields using less seed on average. Finally, as the planting season Vitavax ϩ PCNB targets Rhizoctonia solani, Maxim progressed, replanting plant population density thresholds decreased.
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