[Charl89]

i was going to plant them today but i didnt get a chance to add any fertilizer through the winter (smack on the hand i know) so thought i would add fish,, blood and bone to the soil as i plant stuff. is it ok with carrots and onions? i know carrots hate fertilizer but does this stuff class as it?

[Yorkie]

You'll be fine.  It's large lumps of organic matter that carrots and parsnips are traditionally less keen on.

[JayG]

Carrots (and parsnips) tend to fork either when they hit an obstruction in the soil (usually stones) or if the soil is not an even mixture of nutrients or moisture-retaining material (eg lumps of manure which are not properly incorporated.)

The roots will branch off towards the food/water with the sometimes humorous, but usually tricky-to-peel results. 

BFB would be fine if forked in evenly, but be prepared to net if you have foxes in the area (but you may well be doing that anyway using Enviromesh or similar to protect against carrot fly.) 

As ever, it partly depends on the natural fertility of your soil - my soil is sandy and crops are poor without added nutrients. I use dried chicken poo forked into the ground a few weeks before sowing and don't have many problems.

BFB would also be fine for onions, but again comes with the potential fox alert.