Here is a small quote from the study....
The decrease was significant in the case of the highest N dose (Fig. 1b). THC contents of leaves from various plant regions were significantly different, independent of the N level (Tab. 3, see: F-value of Factor "a") The other factor, N fertilizer treatment, also had a statistically significant effect on THC content of leaves (Tab. 3, F-value of Factor "b"). There was no interaction between the two factors (Tab. 3, F-value of Factor "a X b") in relation to leaf THC content.
Do your research and you can read the entire study....
Conclusion...
DiscussionThese experiments show that the THC content of leaves decreases with increasing N doses. This phenomenon is favorable for agricultural production, because nitrogen fertilization will increase stem yield and simultaneously decrease THC content of the plant significantly. Additional studies are necessary to determine optimal N dose/ha, time of application, fertilizer type and the lowest THC content achievable under field conditions.
I will be waiting patiently for you to show me an experiment that disproves this.