Northwest and Allee Research and Demonstration Farms
Corn plant populations have increased at approximately 400 plants/acre per year over the last two decades. Seeding rates now are commonly in the 32,000 to 38,000 seeds/acre range. Additionally, grain yields are increasing at 1.8 bushels/acre per year since 1996. Because corn plant populations and grain yields are increasing, there has been renewed interest in looking at corn row spacing and seeding rate.
Tuttle, Terry and Licht, Mark
"Corn Row Spacing and Seeding Rate,"
Farm Progress Reports: Vol. 2017
, Article 76.
Available at: https://lib.dr.iastate.edu/farmprogressreports/vol2017/iss1/76