[Terrapreta] Coal & purity of Topic

[Michael Bailes]

On Coal
http://hypography.com/forums/terra-preta/11638-coal-soil-amendment.html
On "purity"
I think there is plenty of room to discuss a wide range of topics on this
list.
m

2008/6/1 Richard Haard <richrd at nas.com>:

>
> On May 31, 2008, at 2:43 PM, Roy Lent wrote:
>
> 1. Is it possible that low grade lignite coal could give the same TP effect
> in soil that charcoal does?
>
>
> no (no remnants of vascular elements)
>
> has anyone ever compared in real test?
>
>
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