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Planting Techniques 

Corn Seeding Rates in the Northeast USA, Bill Cox, Cornell Univeristy, Educational Webcast, Plant Management Network (February 2013) This presentation will help growers, consultants, and other agricultural practitioners in the Northeast USA region select or recommend seeding rates for grain corn production on silt loam soils. New hybrid releases in the late 2000s compared with older hybrids respond more favorably to high seeding rates because new hybrids lodge less, have improved drought tolerance, and may respond to higher rates in narrow rows. Nevertheless, Cornell still recommends seeding rates of 30,000 kernels/acre, similar to recommendations in the early 1990s, despite these improved traits. We will present studies conducted in NY on silt loam soils over the last 20 years that repeatedly have shown that seeding rates of about 30,000 kernels/acre result in close to optimum yields. We will highlight recent field-scale studies (farmer-researcher partnerships) in 2 dry years that show that two recent hybrid releases had maximum relative profit at seeding rates above 30,000 at only 1 (40,000 kernels/acre) of 8 comparisons in 30-inch rows, at 2 (32,800 kernels/acre) of 4 comparisons in twin rows, and 2 (34,500 and 38,700 kernels/acre) of 4 comparisons in 20-inch rows. Based on results of these studies, recommended seeding rates in New York will not change. Nevertheless, because of inconsistent responses across years, sites, and hybrids, we recommend that growers test the response of new selected hybrids to seeding rates on their different fields. Growers can now easily conduct replicated strip-tests on new hybrids at different seeding rates because of the ease in varying seeding rates with new corn planters and the prevalence of yield monitors on most combines. The results of seeding rate studies by growers could also lead to implementation of variable seeding rates within fields.
  Corn Silage Management: Seeding Rates, Bill Cox, Cornell University, Educational Webcast, Plant Management Network (June 2011)

This presentation will help consultants, growers, and other practitioners in the Northeast USA region recommend or select seeding rates for corn silage production on silt loam soils. New hybrid releases in the late 2000s compared with hybrid releases in the 1990s have been reported to respond more favorably to high seeding rates for grain production but there is limited data on responses for silage production. We will present studies conducted in NY on silt loam soils in the 1990s that show that silage yields peaked out at seeding rates between 36,000 and 40,000 kernels/acre, but quality (in vitro true digestibility and crude protein) decreased as seeding rates increased. Consequently, we recommended seeding rates at about 34,000 kernels/acre up until 2009. A recent study (2008 and 2009) with different hybrid types indicated that yields once again peaked out at seeding rates between 35,000 and 40,000 kernels/acre, but with no negative impact on fiber digestibility or starch concentrations (although neutral detergent fiber and crude protein decreased slightly) as seeding rates increased. Based on this recent study, we now recommend seeding rates on silt loam soils of 35,000 kernels/acre for all hybrid types, including brown midrib hybrids.

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Recommended Seeding and Side-Dress N rates Provide Close to Optimum Grain Corn Yields in 2010 and 2011 - February 2012 PDF
Planting rates for Grain Corn - February 2011 PDF
Corn Silage Hybrids and Plant Populations - April 2010 PDF
Agronomics and Economics of Zone Tillage Depth for Corn Silage Production - April 2009 PDF
Planting Rates for Grain Corn and Silage - February 2009 PDF
How About Planting Rates for Grain Corn When Prices are High?- April 2008 PDF
Recommended Planting Rates for Grain Corn on Silt Loam Soils - February 2006 PDF