Agronomist: Corn Seeding Rate A Tough Decision

As planting season approaches for the eastern Corn Belt, corn growers will be making a series of important decisions, including how many seeds to plant per acre for the best potential yield.

Plant populations have been increasing in recent years. For example, in 2012, Indiana’s average was about 29,000 plants per acre. But with a variety of hybrids, growing conditions, data sets and recommendations, the seeding rate decision is far from an easy one.

“Of the many agronomic management decisions a corn grower makes each year, one would think that choice of seeding rate would be among the simplest,” said Bob Nielsen, Purdue Extension agronomist. “Yet, this topic continues to garner a lot of attention in coffee shops, Internet chat rooms, the farm press and in crop seminars. So, apparently this decision is not clear-cut.”

The decision is tough partly because weather conditions aside, yields are determined by a delicate series of components: plants per acre multiplied by ears per plant multiplied by kernels per ear multiplied by weight per kernel.

“On the one hand, more plants per acre should equal more ears per acre, which should be beneficial for optimizing yield,” Nielsen said. “On the other hand, kernel numbers per plant and weight per kernel eventually decrease with increasing plant populations. That’s not good for optimizing yield.”

Part of what has fueled ongoing seeding rate discussions has been growers who believe modern hybrids can withstand the stress of higher plant populations.

Seed dealers and other input suppliers also often encourage the use of seeding rates of 35,000 or more per acre, but Nielsen said growers have to look closely at the data — which can be conflicting and confusing.

Nielsen began evaluating seeding rates in field-scale trials at Purdue Agricultural Centers and with growers statewide in 2001. At the end of the 2012 growing season, he had completed 43 trials and has since compiled data and seeding-rate guidelines for Indiana.

“Results suggest that optimum plant populations for corn grown under typical yield levels and growing conditions are in the neighborhood of 31,150 plants per acre, or seeding rates between 32,500 and 34,600 seeds per acre,” he said. “The results further suggest that corn grown under moderate to severe drought stress conditions may perform best at plant populations no higher than 28,000 plants per acre and perhaps as low as 21,000 plants per acre under truly severe growing conditions.”

Some of those severe growing conditions include drought, non-irrigated center-pivot corners or non-irrigated sandy fields with minimal rainfall.

Leave a Reply

Seed/Biotech Stories
Seed/BiotechSyngenta Delivers Two New Winter Wheat Varieties To Eastern Corn Belt
August 6, 2014
Adding to its portfolio of AgriPro brand wheat varieties, Syngenta introduces SY 007 and SY 474 soft red winter wheat varieties. Read More
Seed/BiotechWater Optimized Seed Flowing Freely
April 1, 2014
As the demand for ag to diminish its water use while maintaining high yields and crop quality increases, three companies are leading the movement to grow more with less water. Read More
Seed/BiotechBayer Applies For Seed Treatment That Protects Against Sudden Death Syndrome
February 26, 2014
If approved, ILeVO seed treatment would be the first product to provide breakthrough protection for soybean seedlings from the soil borne pathogen Fusarium virguliforme, the fungus that causes SDS. Read More
Seed/BiotechSeed Still Central
November 1, 2013
Advancing genetics continue to make seed the crop variable that calls the shots for the season. Read More
Top 100 Articles
CropLife 100The Andersons Starts Venture Capital Subsidiary
January 26, 2015
The Andersons has established Maumee Ventures, a venture capital subsidiary designed to foster promising innovations that strategically align with the company’s core businesses. Read More
CropLife 100CHS Partners With Northern Partners Coop On Fertilizer Warehouse
January 21, 2015
In addition, the two companies will form a joint venture to build and operate a grain barge loading facility that will handle corn, soybeans and wheat for export through the CHS terminal at Myrtle Grove, LA. Read More
CropLife 100Wilbur-Ellis Move To Colorado Complete
January 20, 2015
Wilbur-Ellis Co. announces the opening of its new Agribusiness Division location in the Denver, CO, Metro Area. The new facility will host key personnel as the company shifts the base of its Agribusiness operations from California to Colorado. Read More
CropLife 100United Suppliers, McGregor Co., Five Others To Form Aligned Ag Distributors
January 20, 2015
These companies will continue to operate as independently owned and operated businesses, however, their crop protection divisions will now be formally aligned under the umbrella of Aligned Ag Distributors. Read More
CropLife 100Bozeman Named SEEDWAY Chief Operating Officer
January 16, 2015
He succeeds Donald Wertman, who will retire at the end of August 2015 after 40 years with the GROWMARK subsidiary. Read More
CropLife 100Wilbur-Ellis’ Craig Bair Honored For Safety Contributions To Ag Aviation
January 14, 2015
The William O. Marsh Safety Award recognizes significant achievements in safety, safety education or an outstanding operational safety program. Read More
Latest News
FertilizerH.J. Baker Hires New Crop Peformance Marketing Manager
January 27, 2015
As Marketing Manager for the Crop Performance division, Usman Khalid will work out of H.J. Baker’s global headquarters in Westport, CT, and will drive new initiatives for the division. Read More
CropLife 100The Andersons Starts Venture Capital Subsidiary
January 26, 2015
The Andersons has established Maumee Ventures, a venture capital subsidiary designed to foster promising innovations that strategically align with the company’s core businesses. Read More
Exclusive state-of-the art Stueve Construction designed “Vista View” Elevated Control Room.
Eric Sfiligoj2015 Agricultural Market Read: Mixed
January 26, 2015
The agricultural market could look radically different this year, profit-wise, depending upon which segment you do business in. Read More
Edward Chell Biosafe
Crop InputsBioSafe Systems Names Ed Chell California Territory Man…
January 26, 2015
BioSafe Systems has announced the recent addition of Ed Chell as California Territory Manager for the agrichemical division, supporting the crop protection, water treatment and food safety business segments. Read More
InsecticidesBayer CropScience Introduces Sivanto Insecticide
January 26, 2015
Sivanto precisely targets key damaging pests at multiple insect life stages to prevent damage to plants and help minimize the spread of diseases from insect carriers. Read More
ManagementRetail Collaboration, Communicating Agriculture’s Good …
January 23, 2015
Editors Paul Schrimpf and Eric Sfiligoj discuss the recent creation of Aligned Ag Distributors, and the US Farmers and Ranchers Read More
FertilizerOSU Expert: Toledo Water Crisis A Turning Point For Ohi…
January 23, 2015
The August 2014 water crisis in Toledo, OH, impacted Ohioans’ views of Lake Erie algae problems by increasing the attribution of blame of algae growth on agriculture. Read More
FertilizerH.J. Baker Launching TIGER XP
January 22, 2015
Tiger-Sul introduces this next generation sulphur-bentonite product with a proprietary activator – ensuring farmers have a well-balanced nutrient replacement program. Read More
Crop InputsH.J. Baker Expands China Sales Force
January 21, 2015
Global Agricultural firm H.J. Baker announced that sales veteran Shi Dongshen has joined their Shanghai office in China. This newest hire follows the recent opening of their Lianyungang Sulphur Bentonite Plant. Read More
CropLife 100CHS Partners With Northern Partners Coop On Fertilizer …
January 21, 2015
In addition, the two companies will form a joint venture to build and operate a grain barge loading facility that will handle corn, soybeans and wheat for export through the CHS terminal at Myrtle Grove, LA. Read More
Matt Hopkins5 Bold Predictions For Ag Retail In 2015
January 21, 2015
This past year was filled with ups and downs for the nation’s top ag retailers, but what will 2015 have in store? Read More
SoftwareDeere Launches App Center
January 20, 2015
The John Deere App Center provides users the ability to search and find apps most useful to their business or operations. Read More
Crop InputsNew Syngenta Herbicide Approved In Soybeans, Sunflowers
January 20, 2015
Syngenta will sell BroadAxe XC herbicide in 2015 for use on soybeans, sunflowers and dry peas Read More
CropLife 100Wilbur-Ellis Move To Colorado Complete
January 20, 2015
Wilbur-Ellis Co. announces the opening of its new Agribusiness Division location in the Denver, CO, Metro Area. The new facility will host key personnel as the company shifts the base of its Agribusiness operations from California to Colorado. Read More
Crop InputsNovozymes Sales Figures Up For 2014
January 20, 2015
Novozymes announces its sales growth in 2014 was in line with expectations as sales grew by 7% compared with 2013. Read More
CropLife 100United Suppliers, McGregor Co., Five Others To Form Ali…
January 20, 2015
These companies will continue to operate as independently owned and operated businesses, however, their crop protection divisions will now be formally aligned under the umbrella of Aligned Ag Distributors. Read More
Eric SfiligojGMO Or DNA? LOL Or WTF?
January 19, 2015
A new survey finds the American public seems generally confused when it comes to any three-letter descriptor for their food. Read More
FertilizerAGROTAIN Wins No-Till Product Of The Year Again
January 19, 2015
This marks the 10th straight year AGROTAIN nitrogen stabilizer has been named the top product in this category; no other product has matched this honor Read More