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[EarthNSky <erthnsky AT bellsouth.net>]

Bill Jones wrote:

> It that why my greenhouse, where it never rains at all, has a layer of 
> white alkali just as in a desert?

Unless you are watering with distilled water, your water contains 
mineral salts and various ions.  As you water, these leach out and 
create that white stuff on the pots and such.  The moisture in the 
greenhouse alone may be enough to leach out the minerals from the 
potting mix/soils, creating white salts.

Bev
--
Bevanron of EarthNSky Farm   Sleep well tonight, for somewhere in the 
ocean's depths, MY son is protecting YOUR freedom.