This book is an important contribution to the literature on ecologically based pest management.
Dynamic accumulators (DA) are plants that gather certain minerals and nutrients from the soil and store them in higher concentration in their leaf tissues. The leaves of the plants can then be used as compost, mulch or liquid fertilizer. The truth is that most plants, in a way, are dynamic accumulators in some way because they translocate the soil minerals into their leaves. The difference however, is that certain plants, like horsetail, nettle or buckwheat, for example, tend to pull specific nutrients up in greater amounts. Horsetail is well known for silica, nettle is well known for iron and buckwheat is known for accumulating phosphorus. Other DA”s like comfrey or yarrow are more all purpose accumulators and pull out more proportional balanced NPK ratios. DA’s are traditionally thought of as a class of plants associated with nutritive and medicinal herbs. But please don’t confuse DA’s as a specific class of plants, for they can also include other types of flowers and cover crops as well.
Dynamic accumulators (DA) can really be viewed as nutrient miners. They use their root structure to mine nutrients. They can have deep tap roots or an extensive underground network of rhizomes which translocate those minerals into their leaves. Sometimes they are used to try to repair soil, whereby a DA that has a deep tap root can pull up nutrients, and when the leaves are dropped and mulched over the surface, they breakdown and become bioavailable near the soil surface.
Typically though, people are using DA’s to mine nutrients from nearby soil and then apply those nutrients to another area of a farm or garden. So imagine you have a farm and there’s edges of fields or gardens just sitting there covered with grass. So one would plant a row or swath of, let’s say, comfrey in that area. Then the comfrey would mine the nutrients from that unused area and then the leaves could be mulched into the pots, beds or fields or amended into the compost pile. The comfrey could also be turned into liquid fertilizers or foliar sprays through the extraction processes of fermentation or sun teas.
One of the contended variables of DA’s is the technical science behind quantifying how much nutrients are actually stored. If nettle is good at accumulating iron, but there is no iron in your soil, hypothetically, then it won’t really store that element because it wasn’t there in the first place! Also, it is apparently unknown to science precisely how long it takes for nutrients to become bioavailable. Once the leaves store the nutrients, and the leaves return to the soil, there is little science to quantify how quickly or how much is returned into bioavailable nutrients. Science tends to overanalyze everything and want’s answers before proceeding. So while the scientific community is trying to find the answers to DA’s, the biodynamic and regenerative cannabis communities are embracing DA’s and seeing very positive empirical results. The complexities of DA’s are just beginning to be understood. There are a number of charts online to view which DA’s accumulate specific elements. Even if some of the research is anecdotal, it can still provide a general understanding for those wishing to engage in this practice.
By: Russell Pace – President of the Cannabis Horticultural Association
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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.
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....
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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 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."
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.
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.