That might be possible, I don't know enough about it to say for sure. I could see us needing somewhat less just due to evaporation differences, but I'd think plants need basically the same amount of water to do what they do regardless. How do we get down to 5-10%?
I don't know how, but a different post claimed that indoor farming needs 97% less water. I imagine it has something to do with using a closed loop. (And the remaining percents are obviously due to imperfections, and the actual water content lost due to the removal of the produce from the loop.)
