To bed for winter

Ok, I'm trying my sister's suggestions for putting the bed to bed for winter. Here's the gist:

• layer compost on top (we dug in two beds and just laid it on top in the other two)
• put mulch over that (maple leaves, pretty much)
• apply some urea (a small handful per bed)

I did some variation by way of an experiment. We have 4 beds - starting with the one closest to the house, going clockwise, let's call them A, B, C, D.

A & B - dug in compost, mulched leaves, urea dissolved in 5 gallons of water.
C - dug in compost, leaves only partially mulched, urea just sprinkled on top of the compost
D - dissolved urea, compost laid on top

Let's see what happens!