[Jewelry making - Article 00067] - Re: [Orchid] Recycling investment

[Peter W . Rowe]

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>     I recently received an email about recycling investment. Using it
>     in the garden to enrich the soil. Does anyone know anything about
>     this, it is the last piece of the green techniques I need to put in
>     place. Thanks bunches, 

    Neither silica or gypsum (plaster) are of much use in "enriching"
    the soil, I don't think. And if you've got traces of metals in there,
    that might not be a good thing. But aside from the metal, it probably
    wouldn't harm the soil. Of more concern to me is that investment is
    made with very fine grained silica flour. When dry, that powder in
    the air is very much not a good thing to breath. Wet, it's reasonably
    safe. But mixing it into the soil doesn't somehow bind it up. So if
    it's been a dry month, and wind kicks up the dry dust, you could be
    breathing in a higher percentage of stuff you probably shouldn't be
    breathing in. Probably this is a very small risk, but somehow I can't
    quite think of it as "green". And I don't think it's going to be
    helping your plants grow any better either. 

    Just impressions. Maybe I'm wrong. But just because you physically
    can mix the used investment into your garden soil doesn't mean it's a
    beneficial thing to do... 

Peter
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