I gather it's not the same as fertiliser, but more for improving minerals in the soil. reommended dosage rate is 1 to 10 kg per sq metre. I will then add blood fish and bone as usual for NPK. I already use FYM by the tractorload. What I want to know is am I going to get the huge onions like in their advert. The last time I saw onions like that I was a kid being very impresses by the Robinsons stand at Southport flower show.
I used to use calcified seaweed for minerals but then it became unavailable due to someone stopping the cornish from dredging it off Falmouth. I gather it is ok for the French to dredge it up off Brittany.
Mr Fidgetbones, I'm by no means an expert, but I have already figured out that growing 'giant' veg of any sort usually means growing them completely differently to the norm. Molly-coddling them, growing in barrels of sand, growing in the greenhouse etc etc. They usually taste awful too, my uncle used to grow show veg and he never ever ate them, or even used the ones with 'defects' he discarded from his show table.
I use the dust purely as a longterm slow release to supply the essential minerals that are depleted by successive crops. I'm hoping using good rotation, plenty of fym and some good quality household compost, should keep my soil in tip top condition for my fruit and veg. Also planning on making a worm farm and producing worm tea at some stage, I'm just going to have to wait and see the results over the next few years, but I shall try to keep the forum informed of my findings. Good luck in the meantime, I think the dust is probably mainly to give me peace of mind that I've covered all the bases.