Posted: 26/12/2013 at 14:31
What's your soil like, newboy2? For carrots I add a *lot* of sharp sand as I garden on clay and it works well. Carrots don't need a huge amount of food (unlike onions) so I just add a bit of FB&B like Verdun. For clay soil, this method works well:
Dig a trench the width of a border fork (ie about 6") and about 10" deep, laying the soil at the side. Sprinkle plenty of sharp sand on the removed soil so that it is about 50/50 soil and sand. Mix well by raking over a few times, adding a couple of handfuls of FB&B. Once mixed, rake back into the trench, firm a little and sow the seed, finally covering the seed with about 1/2" of the sand soil mix. Any of the mix left over can be raked over the rest of the bed or removed and stored for later use with compost as a general potting mix.
A few years ago I saw a TV programme where a lighthouse keeper grew the most wonderful large carrots in the virtually pure sand of his little island. All he used was a bit of composted seaweed mixed with the sand so they don't need that much fertiliser to grow well. I think he was on one of the Scottish islands so the growing season must have been relatively short, too.