I don't want to be a downer, but are you sure there are no nasty chemicals on the straw that growies won't like?
I'd ask:
1. Straw from what grain? Some grains are sprayed with nasty stuff near harvest time to encourage it all to dry at the same time.
2. I believe straw is less likely to contain persistent broad leaf deterrent nastiness, but I got a batch of bad horse manure and the spot is still in quarantine 7 years later. If I can get organized, I'll do a seed test on it this year, but it's not got
deer protection around it, so it's hard to tell if the soil is still bad if the deer harvest the plants before they can grow! Grass grows fine - the question is whether broad leaf plants will or not.
Once you've determined the straw is safe, using it as garden edging seems like a fine idea. Here on the Wet Coast, I read about a couple who wanted to garden, but the only spot that got sun was right by the ocean on some big rocks. At that time, it was easy to get bales of
newspaper, so they used those bales to make raised beds, and filled them with seaweed - use what you can get! Newspaper and straw are both extremely high
carbon, so you're going to need lots of greens to balance that, or be growing crops where Fertilizer P can be used. If you sink a plant pot with holes in it into the soil by the straw bales and pour watered down
pee in there, you won't have to worry about it splashing on things. That said, if the soil looks good, I wouldn't overdo it - things like tomatoes don't want too much Nitrogen or they won't fruit for example.
Good luck on your research and keep us posted!