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.