Onion fertilizers

What fertilizer should I use on onions 

Blood, fish and bone for me as well. Avoid too much nitrogen, it encourages green growth and is not good for long storage life.

Use some BFB and dig it in a couple of weeks before planting then broadcast a small sprinkling after a couple of months... 

I no longer use nitrogen rich fertiliser as it gives plenty of green growth which leads to thick necks, which in my experience don't store much past Early December. This year as an experiment I will only add Lime to my soil & see how my Onions go. I say this because in the past I have fed my Onions at least twice in a season and have often ended up with very good sized bulbs with thick necks which rot in the medium term, so I'm hoping for slightly smaller bulbs that last.

One thing I always do is dry the Onions and then dry them again. My best year for Onion storage is when I left the Onions in the ground way past when the foliage died back.