Thanks Lawrence,
The shading from plants may reduce evaporation but that is probably
more than offset by transpiration via the leaves.
I hit on the idea of trying to encourage algae growth in my
irrigation system because of something I read about high fertility in
some of the ancient cultures in which irrigation was used. It was
assumed that part of the fertility was due to the algae that would
form in the extended network of irrigation channels.
Dieter
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