Humic Acid Lowering THC Study

[Cerebral Goo]

Ran across this study and was wondering if it made the rounds on this site when it came out? Anyone know of any more studies?

If you use these, do you stop using humics/fulvics at the end of veg or use it during the full grow cycle?

Impact of N, P, K, and Humic Acid Supplementation on the Chemical Profile of Medical Cannabis (Cannabis sativa L) - PMC

Mineral nutrition is a major factor affecting plant growth and function. Increasing evidence supports the involvement of macro and micronutrients in secondary metabolism. The use of the appropriate nutritional measures including organic fertilizers, ...

www.ncbi.nlm.nih.gov

 

[MIAutomatic]

What study?
You didn’t post anything?
None starter.....

 

[CannabisMingus]

This one?

Frontiers | Impact of N, P, K, and Humic Acid Supplementation on the Chemical Profile of Medical Cannabis (Cannabis sativa L) | Plant Science (frontiersin.org)

 

[Bruce Campbell]

There's this study for Humic Acid:

Impact of N, P, K, and Humic Acid Supplementation on the Chemical Profile of Medical Cannabis (Cannabis sativa L) - PMC

Mineral nutrition is a major factor affecting plant growth and function. Increasing evidence supports the involvement of macro and micronutrients in secondary metabolism. The use of the appropriate nutritional measures including organic fertilizers, ...

www.ncbi.nlm.nih.gov

 

[CannabisMingus]

Seems like they suggest humics reduce variability but inconclusive as to - really- anything.

"While there were some subtle associations linking changes in cannabinoid content and mineral levels, it is difficult to make clear conclusions on their relationship. "

"Organ, compound, and spatial specificities of the cannabinoid accumulation were also identified in response to the enhanced NPK and HA treatments. While the nutritional supplements lowered the cannabinoid content, this was accompanied by significantly reduced variability throughout the plants of almost all of the cannabinoids studied. While the results indeed demonstrate that nutrient supplementation can modulate cannabinoid content in an organ- and location-specific manner, the relationship between cannabinoid content and nutritional supplementation is not very clear."

 

[Bruce Campbell]

Argh...too slow!

 

[CannabisMingus]

Thanks @blue !

 

[CannabisMingus]

Argh...too slow!

@KDawg take a read and see if you come to the same conclusion.

 

[Bruce Campbell]

@KDawg take a read and see if you come to the same conclusion.

Basically.

Their main point was that it improves uniformity of cannabinoids among colas (top vs. bottom) vs. the typical "top cola is much danker than other colas".

They didn't really mention or discuss the net effect on "total plant THC". But, if you look at Fig 4, it looks like THC in the side / bottom colas did not make up for the reduction in the top cola - so, total plant THC may have been lower, too.

However, a few things I noticed:

• The effect varied between cannabinoids (THC vs. CBD vs. CBC, etc) - so could be very cultivar specific
• No significant change in plant height with humic acid, but smaller stem diameters with HA (Table 1). Stem diameter growth rate has been found to be a decent predictor of final total bud dry weight (this article)
• This was one of Bernstein's first studies before focusing on optimizing nutrient levels, so the baseline nutrient levels for the HA-fed plants were a bit low, which could have had an effect. It would have been better if they had a "+NPK and HA" test group.

 

[CannabisMingus]

so could be very cultivar specific

. It would have been better if they had a "+NPK and HA" test group.

Agreed.