Posted: 15/05/2014 at 13:42
I'm in Central Tuscany, where are you? I only know a little about delphiniums but I can help with most of your questions.
1. Lime is calce. If you add it to soil, it makes soil more alkaline. Delphiniums like soil a little alkaline, but soil in Italy is already naturally alkaline anyway. I would be surprised if you needed to add calce.
2. You won't find fish blood and bone meal in Italy. I found blood and bone (sangue e osso) only once. Cornunghia, alone, contains too much nitrogen. The same with dried blood powder.
You can use any Balanced Fertiliser (Concime Bilanciato), either liquido or granulare. 10:10:10 would be best.
3. Delphiniums need very well drained soil. You can use Stallatico
because it will help the drainage. You could also mix in some grit/sand (sabbia) and/or fine gravel (ghiaietto molto fine) to help the drainage.
EDIT. BleuFairy, I just double-checked Stallatico. It's pelleted horse manure. I was thinking of a manure-based soil improver that looks like potting mix when I suggested using it for drainage. I can't remember what it's called here - probably something like Concime di Cavallo (horse) or Animale (animal).
The pelleted (horse or chook) manure won't hurt providing you keep it away from the roots when planting. It has low nutritional value. Your main nutrients will come from the fertiliser (concime) used later.