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Which is *impossible* if your crop spraying.
Which is why you do use narrow wheels and this
http://www.caseih.com/northamerica/en-us/products/application-equipment/patriot-series-sprayers
Actually - growing up on a farm and understanding the dire effect tires can have on crops i can tell you with certainty that both of the scenarios are correct.
We had tractors that were used for specific tasks - like the Farmall - H was strictly a crop cultivating tractor - outfitted with harrows that sat between the front and real wheels and a set that was attached to the 3 point hits in the back - both lowered and actully the back set had removabel man seats that 2 people could sit on the back of the harrow and operate little cultivators by hand to go in between each individual tobacco plant.
We had spray tractors that we moved all the weight we could with very narrow tires once setup never changed.
Our larger field trators hoever depending on what they were being used for we would change the tire locations more than the actual tire widths. Most of the stndard 4 wheel tractors the front mounting units are sliding allowing you to adjust the width of the wheels. The rear tires the hubs are concave so depending which diretion you put them on you could have narrow width unit or a wide width unit. if you put them on the narrow side you could add a second set (like a dual wheel pickup truck) or just have a very narrow setup.
It was more common however that the tractor tire hubs allowed for weigth attachments. and we would attach hub weights to the wheels themselves to give the units mroe traction when plowing ect.
Hope some of that helps on insight into a tobacco farm tractor units.
The only time we used narrow tires was when we where spraying
and we always just have one dedicated tractor for that.
Medium tires, only on new tractors i live in a marsh area, so all tracktors use either
the preferable but more exspensive "bubbleWheels" 2.35 ttimes wider than normal.
Or twin mounts.
The clever thing with twinmounts they are relative easy to fit and remove.
But ofcourse my exsperience IRL is limited to the most known brands of both tires and tracktors.
John Deere, Volvo + Valmet, New Holland (ford old tracktors), Case IH.
EDIT- Ohh yes, most of the soil here is either "SILT" extremely loose and annoying_
or close to CLAY making it hard as concrete. In both cases Mixed with water just results in many more hours spendt in the fields than if it was normal soil.
sorry for the bad english, just woke up xD