Posted: 11/03/2013 at 09:33
I'm going to put the cat amongst the pigeons here (or the over nutrified water amongst the fish). Many years ago, someone who was very high up in the world of horticultural expertise told me that hydroponics were very bad for wildlife. After the crop has grown, the gardener then has to get rid of the over nutrified water; it ends up in rivers and water courses, where the nutrients encourage the water plants to grow rapidly, de-oxygenating the water and effectively killing everything. I am not a scientist, so have probably explained this poorly, but the principles appear valid to me.