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Plant Architecture Effects on Chemical Uniformity

Plant Architecture Effects on Chemical Uniformity Professor DeBacco Research Article Danziger, N., & Bernstein, N. (2021). Shape Matters: Plant Architecture Affects Chemical Uniformity in Large-Size Medical Cannabis Plants. Plants, 10(9), 1834. https://www.mdpi.com/2223-7747/10/9/1834 Plant Morphology and Bud Location Plant shoot growth pattern and shape is commonly manipulated by growers worldwide by numerous techniques including planting density, trellising, plant hormones, and by the physical removal of plant organs. In addition the physical location of the inflorescent on the plants in relation to the light source is also investigated. Both of these factors contribute to the quality of the harvest. Plant Architecture Manipulation Treatments (i) Control- a non-treated control (ii) Defoliation- defoliation 3 weeks prior to harvest (iii) BBLR- “Bottom branches and leaves removal” removal of the branches and leaves from the lower 1/3 part of the plant at the transition to the short-day, commonly known as “Lollipoping” (iv) BBLR + defoliation (v) 1° Branch removal- removal of all branches off the main stem throughout the growing period (vi) 2° Branch removal- removal of all secondary branches from the main branches throughout the growing period (vii) Single prune- pruning the rooted cuttings at the day of transplanting to the experimental pots, leaving six primary branches (viii) Double prune- pruning the plants twice, at the duration of the Single prune and a second time at the transition to the short-day The experiment was conducted in a random experimental design, with six replicates. Replicated groups for each treatment was arranged in 3 rows, out of which a plant from the central row was sampled. Architecture and Cannabinoid Yield The results revealed that pruning the plants twice during cultivation was the optimal practice for increasing yield, and other treatments decreased or did not affect yield quantity. Inflorescences Sampling Locations Inflorescences sampling locations 1–5 along the plant. Image of a control pant. Trimmed inflorescences were dried at 24°Cand 55% air humidity for 14 days, in an environmentally controlled chamber, in the dark. Light Penetration Therefore, architecture manipulation can be utilized to increase yield biomass and standardization, but the cannabinoid yield should be addressed by other means. A considerable reduction of light interception down the shoot was observed, and the extent of spatial standardization of the cannabinoid profile correlated with the effect of plant architecture on light penetration to lower parts of the canopy. This suggests that low light availability at the bottom of the plant is a powerful inducer for reduction of spatial chemical standardization. Light and Buds Many growers in support of the screen of green method highlight the idea that maximizing light exposure will improve bud quality, which this study confirms. However, keep in-mind the added labor and time to properly perform the screen of green, so when an operation is looking to maximize plant growth and efficiency the Screen of Green may not be the most advantageous, but for those with plant number restrictions and not a focus on maximum efficiency and turn over time, this is why the Screen of Green is popular with many growers. Optimizing Plant Structure Double Prune method that also allows maximum light exposure to as many buds as possible. Slightly smaller, but well structured plants can be the top quality producers. Link to Lecture Slides: https://docs.google.com/presentation/... 420 Magazine Source Content by Slide Title: Title https://www.420magazine.com/community... Plant Morphology and Bud Location https://www.420magazine.com/community... https://www.420magazine.com/community... Light Penetration https://www.420magazine.com/community... Light and Buds https://www.420magazine.com/community... Optimizing Plant Structure https://www.420magazine.com/community... https://www.420magazine.com/community... https://www.420magazine.com/community... *Due to the description character limit the full work cited for "Plant Architecture Effects on Chemical Uniformity" can be viewed at... https://docs.google.com/document/d/1U...