What material should I use to fill ruts on a powersports track?

Me and a few friends wore in a track in a field that we have permission to ride in. The owner said we can ride there as long as we don't make deep ruts. All of us have decently powered machines, and have formed some good size ruts on the track. What are some good materials to fill in the ruts that is resistant... show more Me and a few friends wore in a track in a field that we have permission to ride in. The owner said we can ride there as long as we don't make deep ruts. All of us have decently powered machines, and have formed some good size ruts on the track. What are some good materials to fill in the ruts that is resistant to wheel spin/being thrown back out of the rut? Any input is appreciated.
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