Fill in the ruts by hand as best you can by redistributing the disturbed ground.
Chain Harrow which will help again to knock the high bits into the low bits...this can be done even in wetish conditions using a small chain Harrow and quad, or a light tractor or tractor with wide tyres to spread load.
Then roll, timing of the rolling is the tricky bit, you need the ground to be firm enough or dry enough to afford grip, but too dry and the roller will not have enough effect. The same guidelines for machinery apply.