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A Brief History of the Thompson Wheel

No-till seeding (also known as zero-till) is a relatively new phenomenon, and more effective methods are continually being developed. In the U.S. & Canada, most planters and “no-till” drills are ill-suited to the task from the moment they are built (they were engineered for tilled seedbeds). For instance, the original smooth closing wheels on all planters and no-till drills can overpack the furrow, especially if soils are damp, causing poor emergence and poor root penetration of the sidewall. Because of the soil structure in no-till, the solid wheel is ineffective at closing the furrow. To avoid the packing problem, as well as the poor furrow closing by smooth closing wheels, several aftermarket companies began offering spoked wheels to replace the original closing wheel.

Spoked closing wheels first came onto the no-till scene in the early ’90s, and were often simply rotary-hoe wheels or row-cleaner ‘spider’ wheels bolted onto the planter closing brackets. This was novel and insightful. While these first-generation spoked closing wheels were certainly improvements over the smooth wheel, they had significant limitations. Rotary-hoe wheels often excessively packed the furrow sidewall (think of a sheepsfoot), and had some issues with accumulating mud and stalks. The row-cleaner wheels (when used for closing) had such long slender spokes that they tended to lift the sidewall too much, flinging chunks of sidewall in all directions, and sometimes roto-tilling out the seed (the extent to which these are problems depend on amount of pressure on the spoked closing wheel, soil conditions, lateral spacing from furrow, and the degree to which the seed is embedded in the bottom of the furrow). Also, the row-cleaner type of closing wheel did no seed firming whatsoever, but luckily Keeton seed firmers (and several small-diameter ‘seed-lock’ wheels) were introduced to the market about that same time.

By the mid-’90s, at least one spoke design was specifically created to provide the closing action demanded by no-till conditions. This design had spokes with a fairly small surface area at the tip, tapering sides of the spoke, and a shorter spoke length. Although an improvement over the earlier attempts, the new design had problems with durability, particularly frequent bearing failure, and with mud accumulation due to the thickness of the spokes at their base. However, the spoke shape was clearly an improvement over earlier attempts at spoked furrow closing from off-the-shelf wheels designed for other purposes.

Enter the Thompson wheel (in 2002), with unique patented features to dramatically improve performance. The thinness of the wheel allows it to easily enter the soil, for excellent breakage of the sidewall. The thinness is also what prevents mud accumulation on the spokes. It simply has nowhere to gather. The blunt tip & tapering sides of the spokes further assist in crumbling the sidewall. The tapering sides gradually increase the resistance the spoke encounters while operating in the soil. This limits the depth, as does the overall length of the spoke itself (considerably shorter than some other designs on the market). So you get just the right amount of sidewall shattering, without digging too deep.

Chris Horton

Chris Horton brings 25 years of management with him. He grew up on his grandparents farm in Reno County Kansas where they mainly grew wheat and cattle feed. He worked on feed lots as a pen rider and cow-calf operations before moving to Southern California where Chris started a new career in the transportation and transport logistics, eventually managing the western region for a large commercial vehicle leasing company. Chris moved home to Kansas, to manage a local Farmers Coop and then eventually the service dept for a tractor dealership. The opportunity to join the Exapta team came up, and he knew he wanted to be a part of this team.

Bob Pagel

Sales & Service Representative

Prior to joining Exapta, Bob Pagel was an Agricultural Territory Sales Manager for Ritchie Brothers, serving parts of MN, WI and IA. He continues to support his family farm in SE Minnesota.

Jon Zeller

Current Product Engineer

Jonathan Zeller joined Exapta excited to return to working with no-till planting equipment. He supported research of no-till planting and other ag related projects for 7 years with Kansas State University’s Agricultural Engineering Department after getting his engineering degree. He later worked 3 years for Landoll Company, LLC. where he gained experience in a design engineering role. Jonathan grew up on a small family farm in NE Kansas working with row crops, hay and cattle. Jonathan enjoys solving engineering problems and improving or creating products to be robust and easy to install and service.