I have been reading this paper published in the School of Environmental Sciences regarding test results of controlled drought stress and impacts to THCA, CBDA, THC, and CBD.
Increasing Inflorescense Dry Weight and Cannabinoid Content in Medical Cannabis Using Controled Drought Stress
Using Controlled Drought Stress.pdf (262.9 KB)
Part of the Abstract:
Summary of Trial:
In the trial, 14-day old vegetatively propagated rooted cuttings were transplanted and hand-fertigated using a nutrient mix described in the article.
15-days after transplanting, 8 plants were transferred into a larger walking growth chamber for flowering and transferred into 11L pots.
10-days into flower and all the plants were fertigated at the same rate.
39-days into flower and plants were randomly assigned drought or control (non-drought) treatment groups - with 4 plants in each group.
The control group was irrigated without any change.
The drought group was not fertigated until the plant water potential (WP) reached between -1.4 and -1.5 MPa (drought stress threshold). This occurred after 11 days without fertigation.
I also compiled the listed of tools used for this trial:
- Stem Psychrometers and Data Loggers
- Substrate Moisture Sensor
- Leaf Net Photosynthesis Measurement System
This is my attempt at a high-level explanation. I’m sure I might have missed some key points. I attached the article for everyone to read.