~Humboldt Earth Technologies~

As growers we always seem to be searching for the next level. Larger yields, higher quality and ways to cut costs are the general directives we aim to achieve. Within this industry however, there seems to be an overuse of synthetic fertilizers with little understanding of the biological systems involved in nutrient uptake and disease control. Many inexperienced growers overuse synthetic fertilizers, hoping that more nutrients means higher yields. All that really happens is a massive salt buildup, which leads to dead microbes, nutrient lockout, a lot of flushing and heavy fungicide spraying.

Companion Planting with Cannabis

Companion Planting with Cannabis

The Companion Planting for Cannabis workshop will go over all the categories of cover crops and highlight their roles in soil biology and plant fertility while addressing certain caveats when utilizing these systems. It will then transition into companion planting to cover a local case study...

Marijuana Venture - Eastern Washington farm goes green on a commercial scale

Walden Cannabis takes advantage of its massive property by reserving thousands of square feet for insectary beds and cover crops.

The farm’s size also allows Walden to utilize a system of crop rotation — somewhat of a rarity in the cannabis space. After each harvest, the company rotates its grow site to a new section of the property in order to maintain healthy soil....

Pest Alert - Cannabis Aphid

The Oregon Dept of Agriculture has detected a new pest species for cannabis.

Phorodon cannabis, known as the cannabis aphid, bhang aphid, or hemp aphid, feeds on cannabis. It is only known from two locations in Oregon (Portland and Estacada) at this time, but it is very likely that it is established and unrecognized at other facilities. The pest is established in much of Europe and Asia, North Africa, and it is known from Colorado in North America. It appears to be a recent arrival in Oregon, and it is in the interest of all growers of cannabis to slow its spread.

Calcium's role in Cannabis Physiology

Calcium's role in Cannabis Physiology

"Calcium is an extremely important plant nutrient due to its many functions, which includes membrane structural integrity, maintenance of homeostasis, segregation of genetic material during cell division, gene expression, energetics and enzyme activities. The full picture of calcium-mediated physiological processes has not been fully described here nor clarified in academic research; however, researchers do know that calcium is immobile in plants and that it is a constant requirement throughout all growth phases."

Pesticide Article in Marijuana Venture

Pesticide Article in Marijuana Venture

We recently wrote an article fro Marijuana Venture Magazine on the problems with pesticides. Click this link to read about the potential health impacts of residual pesticides and why systemic pesticides might be lurking in your municipal compost.



Within the world of Permaculture we often find reference to plants known as Dynamic Accumulators. In brief, this is the idea that certain plants (often deep-rooted ones) will draw up nutrients from the lower layers of the soil, and these nutrients will be stored in the plants’ leaves. When the leaves fall in autumn and winter and are broken down, those stored nutrients are then incorporated into the upper layers of the soil where other plants will benefit from their deposition.

CHA Membership is now open to all interested researchers, educators, students, horticulturists and industry professionals.

Our membership is a premier package for individuals, professionals and businesses to take part in supporting and expanding their knowledge to develop the scientific understanding for cultivating the highest grade cannabis in the most sustainable fashion. Member funding goes to support the expansion of our database as well as conduct outreach to promote ecologically sound management for the cannabis industry. Our online resource center currently covers three broad categories of Integrated Pest Management, Integrated Nutrient Management & BioControls. Within those categories are a range of fields including but not limited to: pest and pathogen management, predatory insects, biochemical pesticides, microbial pesticides, organic chemical controls, soil chemistry, soil biology, soil physiology, nutrients, additives and a forum to discuss these methodologies and expound on other topics. The current content is heavily built around IPM and pest/pathogen management. (WE HAVE DESIGNED OUR PLATFORM AROUND ELIMINATING HARMFUL PESTICIDES AND TESTING CLEAN) The CHA forum is a private community that only members will have access to. This forum is run by admin with degrees in varying scientific fields. They are highly adept at networking with other peer scientists, growers and businesses to get your questions answered. If you can't find your answer in our database, ask an admin on the forum.


Plant growth-promoting (PGP) microbes

Plant growth-promoting (PGP) microbes

Plant growth-promoting (PGP) microbes are rhizosphere associated organisms that colonize the rhizosphere and rhizoplane and improve plant growth when artificially inoculated onto the seeds or into soil. PGP microbes may promote plant growth either by direct stimulation such as iron chelation, phosphate solubilization, nitrogen fixation and phytohormone production or by indirect stimulation such as suppression of plant pathogens and induction of resistance in host plants against pathogens.

Making the most of an efficient HVAC system for Greenhouses

Great article from Cannabis Business Times...

A greenhouse brings a grow closer to the elements, but the same sun that feeds the plants can also push the temperature far past the comfortable range for cannabis.

One main consideration is whether the greenhouse will be “open” or “closed,” says Nadia Sabeh, agricultural and mechanical engineer for consulting/engineering firm Guttmann & Blaevoet. An open greenhouse has some form of air flow from outside the structure, while a closed greenhouse is structured more like an indoor grow and mostly sealed. But even though an open greenhouse has more interaction with outside air, it doesn’t mean the cooling strategy is ... just to open a window, she says.

Depending on the location of the greenhouse, natural, passive ventilation is an option with ridge vents or open side walls, which can be manual or automated, says Sabeh....

Effect of Aerated Compost Tea on the Growth in Organic Cultivation

Effect of Aerated Compost Tea on the Growth in Organic Cultivation

Effect of Aerated Compost Tea on the Growth Promotion of Lettuce, Soybean, and Sweet Corn in Organic Cultivation
Journal of Plant Pathology 2015

Here we see that Compost Tea is well worth the effort.   Four types of compost were brewed and then the available nitrogen was determined, as well as the density of microbial communities, along with their affect on plant growth characteristics.  Across the board it was shown that aerating compost tea released more nutrients, increased microbial counts, and helped plants grow.  Way to go AACT.   

Article Courtesy of TeaLab



While regulators scratch their heads trying to figure out how to best
approach this topic, it’s clear that “business as usual” may turn into
“business unusual.” Many farmers groan as engineering fees, soil
tests, and permitting costs raise the price of going “legal”, but some
growers and professionals are nodding their heads in approval.