Calmer Technology Explained

why run calmer?

The Stalk Roll Perfected

Why Calmerize
your factory corn head?

Calmer BT Chopper® Stalk Rolls and Residue Management Kits help reduce a management pass across the field, improve planting operations, last longer than factory parts, and increase yields and profits!  100% satisfaction or your money back guaranteed!

 #1 john deere tested

#2 Endorsed on

#3 University Proven

#4 Mechanical and Agronomic Advantages

#5 Award Winning



John deere Tested


In 2015, John Deere & Co. tested their stalk rolls against Calmer’s BT
Chopper® and another aftermarket stalk roll design.
Their tests supported what we’ve been saying all along about the benefits
that make our stalk roll kits the most effective on the market.

John Deere’s tests showed that Calmer BT Chopper® Stalk Rolls have
the lowest gearbox spreader load (stress on pinion shafts) than even
factory john deere stalk rolls.


Calmer Stalk Rolls take a minimal amount of additional horsepower
compared to standard Deere rolls and 22% less horsepower than the
360 Chainroll.

When comparing Calmer Stalk Rolls to rotary-bladed chopping corn
heads, our rolls use 25% less horsepower, are lower maintenance, are
less expensive, and leave stubble that is easier on tires.


Calmer BT Chopper® Stalk Rolls cut, chop and shear cornstalks into the
smallest pieces in the industry for fast decomposition, easier planting,
and higher yields.

US = 1′′-2′′ PIECES



Endored on continues to be a trusted medium where farmers can 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 Calmer-related discussions 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 respondents 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


University Proven

A study from the University of Illinois’ Department of Crop Sciences found that Calmer BT Chopper® Stalk Rolls increase continuous corn yields by an average of 6 bushel per acre when compared to OEM stalk rolls.

Small pieces = faster breakdown

Image A) Standard stalk rolls fail to engage and process stalks properly, resulting in additional management passes and lower yields due to nutrients being immobilized on the soil surface. 

Image B) Calmer BT Chopper® Stalk rolls chop stalks into small pieces while simultaneously exposing the inner pith to recycle critical nutrients back into the soils faster, resulting in faster degradation rates and higher yields. 

higher yields:

The University of Illinois study showed the way Calmer BT Choppers® size cornstalks increased corn on corn yields be an average of 6 bushels per acre!


By exposing the inner pith of the stalk, the Phosphorus, Potassium, and Nitrogen applied to grow the crop are recycled back into the soil instead of remaining immobilized on the soil surface. 


Quicker emergence:

Seedling emergence in continuous corn was significantly delayed during the first 5 days of emergence (3-26% delay across harvest method; P= 0.007) compared to corn in rotation with soybean. Stand establishment was reduced in corn on corn vs. corn following soybean (94% vs. 97%, respectively) 


accelerated decomposition:

Allow the natural elements to work for you toward breaking down cornstalk residue. The study showed that cornstalks sized by Calmer BT Choppers® degraded 7% faster than residue managed by factory stalk rolls.  

Reason #4

Mechanical and Agronomic Advantages

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

Mechanical Advantages:

  • Smallest Residue Sizing
  • Performs in All Crop Conditions
  • 25% Less Hp Needed than with Chopping Heads
  • Superior Cornstalk Engagement
  • Better Ear Separation
  • Less Tire Wear
  • Less Butt Shelling
  • Allows for Slower Head Speeds
  • Lasts Longer than OEM Components
  • Easier on Gearboxes
  • Increased Ground Speeds

    Agronomic Advantages

    • Faster Residue Decomposition
    • Easier Planting
    • Compatible with all Tillage Systems
    • Warmer Soils
    • Drier Soils
    • Increased Earthworm Populations
    • Reduced Nitrogen Penalty
    • Higher Yields
    • More Flowable in Heavy Rainfall Events
    • 100% Return On Investment

    Reason #5

    Award winning with a 100% Money Back Guarantee

    Because our products are farmer invented, farmer tested and farmer proven, everything comes with a 100% Satisfaction or Your Money Back Guarantee. 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. Because customer demand continues to grow each year, call early in the season to place your order and calculate the return on investment you’ll see from your acreage.

    Voted to No-Till Product of the Year list 5 times

    Frequently Asked Questions

    Q: What is the life expectancy of the BT Chopper®stalk rolls?

    We generally see 500-1000 row acres.  Simplifying that out for example, projected life expectancy for BT Choppers® on an 8-row corn head would be between 4,000 and 8,000 acres harvested in total. Life expectancy is maximized when following Calmer’s recommended corn head angle settings.

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

    Yes – definitely, and that increases the value of your investment. We publish the installation manuals and provide phone support for questions that may arise.

    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” feeding chamber?

    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®?

    Click on a make/model below for full details on the technology offered to refine your corn head.