I have two beds that have just been put together. Both beds are the same size 4 foot by 16 foot long and empty ready to be filled. I like to start filling them with peat moss I add a 3 cubic foot bag in each bed.
Next I add some good compost.
Then some rock dust. This is granite. I purchased this granite at a sand and rock company it is a finely sifted granite. Five to Ten percent of the bed will be filled with rock dust
Next a few bags of manure. Mix well and keep adding manure, peat moss, compost, rock dust, vermiculite or perlite until filled.
When I fill my raised beds my formula is 10 percent rock dust 5 percent will work but I like 10 percent best and this you can get at your local cement company or rock and sand company if you have your own truck it is very affordable about 10 to 20 bucks for a half yard I like granite or volcanic cinder sand but river rock crushed and fine screened is good. Next 40 to 50 percent will be compost. Then comes the other 40-50 percent I suggest peat moss and vermiculite or perlite a good mix of both would be best.
And thats it add water and a good heirloom tomato and you will be rocking some killer tomatoes... lol later dayz... dusty... In the next few weeks I will mix up my container mix. It is very simular but with a little more vermiculite or perlite and I use azomite as my rock dust in this mix at about one pound per square foot.