I think most failures don't come down to the method you use for growing(soil or hydro) but other things like I was just telling omar , room environment. With too hot a room if the nutrient solution isn't insulated from the heat of the room(this is where igloo coolers come in) then you have nutrient temp issues which causes all kinds of bad things to happen so you can either run a sterile res as best you can OR you can run beneficial bacteria(find details in heisenbergs ewc tea thread). I like to keep things sterile myself so I go through a lot of h2o2 even though I keep my res at a very low 60 degrees F. Of course winter being upon us water is easier to cool(my chiller hasn't come on for days). where soil may handle heat better the plant handles it no better and gets heat stressed just as it would in hydro. in soil if you overfeed the plant gets burnt just like in hydro, so how is it easier to grow in soil is my question.