Yes, I'd do both of those things. Your plants would probably benefit from some sort of fertilizer.

Side-dressing with composted manure should help. There are liquid organic fertilizers available, like Neptune's Harvest fish and/or seaweed fertilizer.

You could also put down a good organic mulch (hay or straw, or something other than wood chips), which would keep in the moisture, and begin the process of breaking down into the soil for next year's crop.

Good luck.