Well-rotted compost or manure can be dug into the soil. Alternatively a mulch of partially rotted straw, compost or crop residue on the soil helps keep the soil surface in good condition, slows water evaporation from the soil, and suppresses weeds.
The good news is that spuds will grow in some very coarse media. They will grow in well rotted straw, clumpy compost or manure, and even in the compost heap itself if it has cooled down sufficiently for them. Go on, grow your own spuds.
It's hard to add too much organic matter. Just make sure that if you're adding a lot of un-decomposed, carbon-rich materials (leaves, rotted straw) you add some extra nitrogen to give the microbes the fuel they need to do their work.
 See also: Gardening, Compost, Mulch, Plant
  
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