[Jewelry making - Article 00151] - Re: [Orchid] Recycling investment

[John Dach]

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    Gypsum is a god source of Calcium. It also contains sulphur, which
    is short supply in many agricultural soils. Often it is said to
    acidify the soils (the sulphur) but more often the bit of
    acidification is far outweighed by the addition of the calcium and
    often, both are needed anyway even though the soil is acid. If one is
    in an area low in calcium, calcium if often more important to put on
    the soil than most any other fertilizer/nutrient as proper calcium
    levels will allow all sorts of other soil solution reactions to take
    place. It is also one of the very important elements in plant cell
    structure. Blossom end rot on tomatoes, summer squash or rot/soft/
    brown centers of apples and especially pears is a sign of low
    calcium. As to the toxicity of the Crystobolite that MIGHT be in the
    used investment (if it wasn't added by the manufacturer or you didn't
    go higher that 1600 F in burnout) there should not be any. There are
    some propriety things added (fiberglass fibers and ???) that I cannot
    comment on. But if the spent investment is worked into the soil,
    there should not be any dust to worry about and a good healthy soil
    holds on to, breaks down and/or uses all sorts materials, far more
    than the NPK "fertilizers" though of today as the main plant "foods".

    Also the reason the spent investment makes the soil lighter or
    easier to till, is it allows better "flocculation" for small crumbles
    of soil to form, holding more water and air (very important in
    healthy soils) to be present. Sheet rock trimmings are a great (free)
    resource for calcium, can be used in the garden paths this year and
    tilled in next, giving less soil compaction from walking on the
    soil, weed control, water control and a mineral source for next year. 


John Dach


 
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