[Terrapreta] USDA organic certification standards

[Douglas Clayton]

Greensand supplies marine potash, silica, iron oxide, magnesia, lime,  
phosphoric acid and 22 trace minerals.  I've used it every year for the  
past 27.    'tis not the same thing as "geen sand".

http://www.state.ar.us/agc/greensan1.htm
Doug


On Mar 26, 2007, at 11:02 PM, rukurt at westnet.com.au wrote:

> Sean K. Barry wrote:
>> Hi Tom,
>>
>> Sand maybe (to help with drainage)?  Gypsum (calcium sulfate  
>> dihydrate), clay, vermiculite, and perlite are all minerals with low  
>> solubility and help soil hold water.  Gypsum releases nutrients and  
>> improves soil structure.  Vermiculite has high cation exchange  
>> capacity.  I believe charcoal is insoluble.
>>
>> SKB
>>
> Green sand has special properties, not sure what they are. Aparently
> it's not green, basically it's moist sand and clay mixture and used in
> metal casting molds. What it does in gardens I don't know. Just  
> googled it.
> Vermiculite and perlite are are both manufactured by heatreating rock.
> Gypsum breaks up clay, clay makes sand less permeable and helps to hold
> water. Yes, charcoal is insoluble, that's why it will sequester carbon,
> but it's porous nature allows it to adsorb and harbour all sorts of  
> things.
>
> Kurt
>
> _______________________________________________
> Terrapreta mailing list
> Terrapreta at bioenergylists.org
> http://bioenergylists.org/mailman/listinfo/ 
> terrapreta_bioenergylists.org
>
>
Douglas Clayton
50 Bullard Road
Jaffrey, NH 03452
H. 603-532-7321
W. 603-532-1120
Fax. 603-532-4581
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: text/enriched
Size: 1644 bytes
Desc: not available
Url : /pipermail/terrapreta_bioenergylists.org/attachments/20070326/4d13c50a/attachment.bin