Effect of Soybean Row Width and Population on Weeds, Crop Yield, and Economic Return

By D. Harder, Christy L. Sprague, K. Renner. Weed technology, 2007

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Potential Synergistic Effects of Cereal Rye Biomass and Soybean Planting Density on Weed Suppression (2011, background): “Several experiments 244 N Weed Science 59, March–April 2011 have demonstrated that the economic optimum seeding rate in these systems may be lower than expected, allowing farmers to reduce seed costs and associated technology fees (De Bruin and Pedersen 2008; Harder et al. 2007).”
Soybean yield partitioning changes revealed by genetic gain and seeding rate interactions (2014, background): “Of interest, though, is the fact that many field research experiments have established that soybean can produce relatively similar yields from large changes in plant density (Carpenter and Board, 1997a, 1997b; Board, 2000; Edwards and Purcell, 2005; Harder et al., 2007; Lee et al., 2008).”
Weed management using crop competition in the United States: A review (2017, background): “Increasing the soybean-seeding rate from 124,000 to 494,000 seeds ha 1 reduced weed interference and increased soybean yield by 48% (Oplinger and Philbrook, 1992; Harder et al., 2007; Arce et al., 2009).”