Thanks Hugh and Ozzy, I did think I may have fertility problems (well the plot rather than me!) - I've started collecting lots of nice things to make compost - esp seaweed which is supposed to be brilliant, prunings/grass from my own garden (and my neighbours). Although my soil must have some fertility - it was nicely covered in huge amounts of marestail etc., I don't think it will grow great veg without a bit of help, and may well be a dust bowl in another dry summer. Off to the stables for more manure methinks!