Tire pressure has little to do with it when you ride over a broken bottle.
That said, you max pressure is indicated on the side of the tire. A higher pressure gives you less rolling resistance, but a harsher ride. A lower pressure gives you a plusher ride. Too low a pressure might result in an increase in snake bite flats.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.