The level of polyethylene raft descended average 3.3 cm so that
the water loss in 4 wk was estimated only about 3.3% or about
0.1% d1. Since water surfacewas afloat with polyethylene raft, only
the feeding corner area (15 cm 15 cm) was open to evaporation.
Other part of the water loss could be attributed to transpiration at
the leaf surface, which could be quite limited, too.