Effects of a Microbial Biostimulant, Mammoth PTM, on Cannabis sativa Bud Yield

Conant, Richard T.; Walsh, R. P.; Walsh, Michael P.; Bell, Colin W.; Wallenstein, M. D.

doi:10.4172/2376-0354.1000191

Cited by 26 publications

(36 citation statements)

References 13 publications

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“…Data were collected as treatment means, based on variety, plant density (plants m −2 ), concentration of CO 2 during cultivation, light intensity (W m −2 and photosynthetically active radiation, PAR, μmol m −2 s −1 ), light source (high pressure sodium, HPS, or fluorescent), photoperiod during vegetative growth and flowering stage (h), maximum temperature during growth (°C), and fertilizer rate (mg N L −1 ) from Vanhove et al (2011, 2012), Potter and Duncombe (2012), Potter (2014), Caplan et al (2017) and Conant et al (2017) (Table S2). Based on availability, yield was recorded as either yield per plant, yield m −2 and/or yield W −1 ; percent THC and CBD in flowers at harvest were also recorded (Table S1).…”

Section: Methodsmentioning

confidence: 99%

Closing the Yield Gap for Cannabis: A Meta-Analysis of Factors Determining Cannabis Yield

et al. 2019

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Until recently, the commercial production of Cannabis sativa was restricted to varieties that yielded high-quality fiber while producing low levels of the psychoactive cannabinoid tetrahydrocannabinol (THC). In the last few years, a number of jurisdictions have legalized the production of medical and/or recreational cannabis with higher levels of THC, and other jurisdictions seem poised to follow suit. Consequently, demand for industrial-scale production of high yield cannabis with consistent cannabinoid profiles is expected to increase. In this paper we highlight that currently, projected annual production of cannabis is based largely on facility size, not yield per square meter. This meta-analysis of cannabis yields reported in scientific literature aimed to identify the main factors contributing to cannabis yield per plant, per square meter, and per W of lighting electricity. In line with previous research we found that variety, plant density, light intensity and fertilization influence cannabis yield and cannabinoid content; we also identified pot size, light type and duration of the flowering period as predictors of yield and THC accumulation. We provide insight into the critical role of light intensity, quality, and photoperiod in determining cannabis yields, with particular focus on the potential for light-emitting diodes (LEDs) to improve growth and reduce energy requirements. We propose that the vast amount of genomics data currently available for cannabis can be used to better understand the effect of genotype on yield. Finally, we describe diversification that is likely to emerge in cannabis growing systems and examine the potential role of plant-growth promoting rhizobacteria (PGPR) for growth promotion, regulation of cannabinoid biosynthesis, and biocontrol.

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Section: Methodsmentioning

confidence: 99%

Closing the Yield Gap for Cannabis: A Meta-Analysis of Factors Determining Cannabis Yield

et al. 2019

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“…The bacterial consortium favoured plant growth development and the accumulation of secondary metabolites (i.e., CBD and THC). Conant et al [93] reported on significant marijuana bud yield of 16.5% and plant height as a result of treatment with the microbial biostimulant Mammoth PTM, a multispecies consortium comprised of four bacterial taxa Enterobacter cloacae, Citrobacter freundii, Pseudomonas putida, and Comamonas testosteroni [94]. In the case of fungal endophytes, root inoculation of hemp by AM fungi enhanced tolerance of hemp to accumulate Cd, Ni, and Cr [95].…”

Section: Endophytes As Cannabis Microbial Biostimulantsmentioning

confidence: 99%

Cannabis Microbiome and the Role of Endophytes in Modulating the Production of Secondary Metabolites: An Overview

Taghinasab

Jabaji

2020

Microorganisms

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Plants, including cannabis (Cannabis sativa subsp. sativa), host distinct beneficial microbial communities on and inside their tissues and organs, including seeds. They contribute to plant growth, facilitating mineral nutrient uptake, inducing defence resistance against pathogens, and modulating the production of plant secondary metabolites. Understanding the microbial partnerships with cannabis has the potential to affect the agricultural practices by improving plant fitness and the yield of cannabinoids. Little is known about this beneficial cannabis-microbe partnership, and the complex relationship between the endogenous microbes associated with various tissues of the plant, and the role that cannabis may play in supporting or enhancing them. This review will consider cannabis microbiota studies and the effects of endophytes on the elicitation of secondary metabolite production in cannabis plants. The review aims to shed light on the importance of the cannabis microbiome and how cannabinoid compound concentrations can be stimulated through symbiotic and/or mutualistic relationships with endophytes.

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“…Biostimulants are biological products that improve the productivity of plants. These products are often a mixture of compounds derived from various organisms, such as bacteria, fungi, algae, higher plants or animals, and frequently possess unexplained modes of action (Calvo, Nelson, & Kloepper, 2014;Conant, Walsh, Walsh, Bell, & Wallenstein, 2017;Yakhin, Lubyanov, Yakhin, & Brown, 2017). Specifically, the bacterium Bacillus pumilus, Meyer and Gottheil, (Bacillales: Bacillaceae) is known for its growth promoting properties (de-Bashan, Hernandez, Bashan, & Maier, 2010;Gutiérrez Mañero et al, 2001;Probanza, Lucas, Acero, & Gutierrez Mañero, 1996).…”

Section: Introductionmentioning

confidence: 99%

Onion thrips Thrips tabaci [Thysanoptera: Thripidae] reduces yields and THC in indoor grown cannabis

McCune

Murphy²,

Eaves

et al. 2020

Preprint

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Cannabis (Cannabis sativa L. (Rosales: Cannabaceae)) is a newly legalized crop and requires deeper insights on its pest communities. Here we identified the thrips species affecting indoor grown cannabis in Canada and tested its impact on plant yield. We used three levels of initial infestation (0, 1, and 5 thrips) on individual plants grown in two mediums: normal substrate or substrate containing the biostimulant Bacillus pumilus, Meyer and Gottheil (Bacillales: Bacillaceae). We found that the onion thrips, Thrips tabaci (Lindeman) (Thysanoptera: Thripidae) is proliferating in indoor grown cannabis. Furthermore, our results showed fresh yields were higher for the plants that initially received zero thrips compared to those who initially received five thrips. Moreover, the biostimulant had only a marginal effect on the reduction of the thrips' impacts. We highlight the importance for growers to carefully monitor thrips infestations in indoor grown cannabis. Finally, we emphasize the need for more research regarding the impact of pests on cannabis yields and safe means of pest control for this strictly regulated crop.

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Effects of a Microbial Biostimulant, Mammoth PTM, on Cannabis sativa Bud Yield

Cited by 26 publications

References 13 publications

Closing the Yield Gap for Cannabis: A Meta-Analysis of Factors Determining Cannabis Yield

Closing the Yield Gap for Cannabis: A Meta-Analysis of Factors Determining Cannabis Yield

Cannabis Microbiome and the Role of Endophytes in Modulating the Production of Secondary Metabolites: An Overview

Onion thrips Thrips tabaci [Thysanoptera: Thripidae] reduces yields and THC in indoor grown cannabis

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