permaculture

["Lawrence F. London, Jr." <lfl@intrex.net>]

Keith Johnson wrote:

> Right, Larry, I've used a number of sources for dusts and fines 
> including a quarry in the northwest that produced a super-fine 
> material that worked very fast. Even the coarser material is effective 
> but takes a little longer for results to show up. I urge those 
> interested to ask for details from each particular regional quarry as 
> they are required to have their material tested for heavy metals and 
> should be able to provide a detailed assay of mineral components.
Go for the highest mesh fines you can get ---> 200 mesh for starters
screenings will take forever to provide plant-available micronutrients

They all have a printed MSDS sheet t hand out to customers (materials 
safety data sheet)

> Lawrence F. London, Jr. wrote:
>
> > > Pure environmentally clean finely ground rock dusts can be had free 
> > > for the hauling from nearly all rock quarrries - this material is 
> > > nearly as valuable as rock phosphate and greensand and  adds 
> > > significantly to the  flavor and nutritional quality of  crops.