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Elise, tractor size is important to consider. When using earth engaging implements it is important to have a bigger tractor as it allows you to use wider implements saving you time and trips up and down the rows. However you also have to consider weight. Compaction is your enemy in the truffière so you need to make sure you are using the proper tires, that you limit the use of the tractor as much as you can. One of the use of the tractor could be for mowing, but this year I found that using a zero turn mower to be a significant improvement because of its maneuverability and its light weight. Please view my tractor post in the Equipment Q&A forum and be on the lookout for a zero turn mower review shortly.
Also, consider getting your tractor used. Unlike car you assess the age of a tractor by its hours of use, rather than by its model year. You can find older tractor with few hours for a good discount on Craig’s list.