Top Reasons To Buy

Reason # 1: John Deere Tested 

In 2015, John Deere & Co. tested their stalk rolls against the BT Chopper® Stalk Rolls and another aftermarket stalk roll design. Their tests supported what we’ve been saying all along. 

Source: Data published by Deere & Company. YouTube, under the name “John Deere 600C Stalk Roll Advantage.” 

*Disclaimer: Trademarks are not owned by, affiliated with, or under license to Calmer Corn Heads, Inc. and are used solely for truthful advertising for the utility of Calmer Corn Head products advertised herein. 

Reason # 2: Endorsed on continues to be a trusted medium for farmers to openly exchange ideas and reviews on ag products. Over the years, discussions surrounding Calmer products have attracted more than a million views. Below are some past topics important to farmers. 

  • Are Calmer Corn Head Products worth the money? Posted 12/3/2013
    • An overwhelming majority of respondents said yes 
  • Calmer stalk rolls vs. Geringhoff Rota Disc Posted 10/16/2016
    • An overwhelming majority of respondent preferred Calmer BT Choppers® over the Geringhoff Rota Disc 
  • Satisfied with the longevity of Calmer BT Choppers®? Posted under “Calmer’s Kit” on 10/27/2016
    • An overwhelming majority of respondents were satisfied with the longevity of Calmer BT Choppers®  
  • Overall satisfaction with Calmer products
    • An overwhelming majority of respondents were/are satisfied with Calmer products. 

Reason # 3: University Proven 

In 2016, The University of Illinois’ Department of Crop Sciences found that Calmer BT Chopper® Stalk Rolls increase continuous corn yields by 6 bu per acre when compared to OEM stalk rolls! 

Mechanical residue management in corn on corn the previous fall (A and B) and at the R3 growth stage the following season (C and D): Standard stalk rolls (A and C) and Calmer BT Choppers® (B and D). 

Reason # 4: Mechanical and Agronomic Advantages 

With numerous mechanical and agronomic advantages, you’re getting more than just corn head parts, you’re getting a peace of mind that your residue management problems are solved for good during harvest. 

Mechanical Advantages: 

  • 25% Less Hp Needed than with Chopping Heads 
  • Superior Cornstalk Engagement 
  • Better Ear Separation
  • Less Tire Wear
  • Less Butt Shelling
  • Slower Head Speeds
  • Lasts Longer than OEM Components
  • Easier on Gearboxes
  • Increased Harvesting Speeds

Agronomic Advantages

  • Unmatched Residue Decomposition
  • Easier Planting
  • Compatible with all Tillage Systems
  • Warmer Soils
  • Drier Soils
  • Increased Earthworm Populations
  • Reduced Nitrogen Penalty
  • Higher Yields

Reason # 5: Award Winning. Farmer Invented. Farmer Tested. Farmer Proven. 

Because all of our products are farmer invented, farmer tested and farmer proven, everything comes with a 100% money back guarantee from the inventor/owner/researcher himself, Marion Calmer. Having been voted to the No-Till Product of the Year list five times, farmers across North America continue to rely on our award-winning technology to solve their residue management and corn head problems for good during harvest.

Marion Calmer, a farmer, inventor and researcher from western Illinois, is the CEO of Calmer Corn Heads, Inc. and founder of Calmer’s Ag Research Center, the largest independently funded, farmer-run Ag research center in the United States. He is credited with inventing the world’s first single chain, narrow row corn head for 12- and 15-inch rows, along with building the world’s largest corn heads. As the owner of more than a dozen patents that have helped revolutionize the Ag industry in America, Marion’s top priority is to help other farmers maximize their potential profits through research and innovation. 


Frequently Asked Questions

Q: What is the life expectancy of the BT Chopper® stalk rolls?
500-1000 row acres (For example, projected life expectancy for BT Choppers® on an 8-row corn head would be between 4,000 and 8,000 acres. Life expectancy is maximized when following Calmer’s recommended corn head settings)

Q: Can I install the stalk rolls/kit myself? 

Q: Is there really an advantage to Calmer stripper plates? 

  • Reduce trash intake by an average of 33%
  • Help increase harvesting speed
  • Reduce butt shelling problems

Q: What is the advantage of Calmer’s patented “open window”? 

  • 100% cornstalk engagement
  • Increases stalk roll life
  • Reduces low ear snap and bulldozing of stalks at the end rows

Q: Do I need to buy the entire kit to see positive results?
No Installing Calmer BT Choppers® by themselves will yield positive results and increase your corn heads performance; however installing Calmer’s entire upgrade kit will result in maximum performance.

Q: How much horsepower does it take to run Calmer BT Choppers® ? 

  • Approx. 1 more horsepower per row than OEM stalk rolls
  • 25% less horsepower needed than with chopping corn heads
  • Significantly lower spreader load than OEM stalk rolls, which means LESS STRESS ON YOUR GEAR BOXES

Q: Can I bale behind Calmer BT Choppers® ? 
Yes, cattle love baled BT Chopper® residue for bedding/roughage. 

The Economics

At Calmer Corn Heads, we believe if you’re going to spend your hard-earned money on products for your farming operation, there must be proven track record and a return on your investment (ROI). As a farmer invented, farmer tested and farmer proven solution to both corn head and residue management problems, we are confident this kit will not only perform to the highest of standards, but will also make you money in the process.

Complete the ROI plan below to get an estimate on the economic return of running Calmer BT Chopper® Stalk Rolls and Upgrade Kits



*Corn and soybean values based on market year average prices for 2018, published by USDA in “Agricultural Projections to 2026”

1 “Residue and Agronomic Management to Lessen the Continuous Corn Yield Penalty,” Alison Vogel, Tryston Beyrer, Dr. Fred Below – Department of Crop Sciences, University of Illinois at Urbana-Champaign
2 Calmer Agronomic Research Center
3 Plastina, A. and Johanns, A. (2018). 2018 Iowa Farm Custom Rate Survey. [online] Ames, Iowa: Iowa State University Extension and Outreach, p.1. Available at: [Accessed 5 Jun. 2018] .

The foregoing economic worksheet is based upon data from agronomic educational institutions or other institutions. Calmer Corn Heads’ use of this data is reflected in the worksheet, but other data or factors may be used to produce differing results and, also, results may vary based upon farmer’s actions, field conditions and geography. Calmer Corn Heads makes no warranties, guarantees or promises as to the data or the analysis presented in the worksheet, or recommendations based thereon.

"We're able to run 5.5 mph and doing a nice job of chewing up the stalks."

- Curt Ulmer, Menno SD