I just reread the experiment excerpt and have a big problem with this:
Straumietis says he ran another comparison test that measured percentages of three cannabinoids. Again, Advanced Nutrients came out on top, producing 21.2% THC, and very low percentages of two other cannabinoids (cannabinol and cannabidiol, known as CBN and CBD), that limit marijuana's psychoactive effects.
The second place finisher in the cannabinoid percentage category was GrowTek, which produced 18.7% THC while also producing a whopping 9.09% CBD and 5.84% CBD. While CBD and CBN have some medical applications which THC does not, in practical terms important to those who want potent recreational marijuana, these cannabinoids can also reduce the psychoactive effects of THC
from:
http://www.marijuanafertilizers.com/advanced-nutrients-fertilizers-comparision-experiment.html
They arent giving CBD enough credit and I have never heard in my life of a plant under any nutrient condition producing 9.09% of it. Someone correct me if this happens though. I believe this experiment is clearly biased.