EarthNSky wrote:I should point out that my greenhouse has no "moisture" to speak of. It's entirely open at the ends, so it only serves to raise the heat some in summer, and keep the rain off in winter. It's drier than the surroundings, since it's hot in there in summer. The white salts come from the repeated evaporation of irrigation water.
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
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