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Old 03-15-2019, 02:02 AM #1
xBOBxSAGETx
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Heavy metals in Organics

Hey guys, there seems to be no discussion about this but I’ve just been educating myself in Organics in general. Residual heavy metals seem to be a common thread in Organics. Rock dusts being the heaviest hitter amongst organic fertilizers. Has anyone tested their flowers for heavy metals and is this simply fear mongering? Or is this truly a concern? As with everything surrounding cannabis the research in limited but Organics in fruits and vegetables the info is out there. I’ve read that roly-polys reduce heavy metals. Any thoughts/opinions? I am a novice grower and not biased towards organic or synthetic growing. What I can get behind with Organics is having things correct at the source (soil) and not having to supplement with bottled nutrients to feed my plant. Other than that I’m not into the “organic” lifestyle with my day to day life.

Im planning on doing some experiments with lab tests. I just want to know what you guys think before hand!
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Old 03-15-2019, 06:07 PM #2
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Being that cannabis is used, the world over, for phytoremediation of contaminated grounds (Cherynoble for instance); you should be concerned with heavy metals in your medium/plants. I doubt anybody is testing for them though.
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Old 03-15-2019, 06:34 PM #3
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Originally Posted by MJPassion View Post
Being that cannabis is used, the world over, for phytoremediation of contaminated grounds (Cherynoble for instance); you should be concerned with heavy metals in your medium/plants. I doubt anybody is testing for them though.

There is testing available for heavy metals in plant material.
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Old 03-15-2019, 07:05 PM #4
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if you want alot heavy metals.
Grow UNorganic.

Keep use those chemical nutes and you will have that

Organic grow is pure nature
SORRY
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Old 03-15-2019, 07:45 PM #5
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Quote:
Originally Posted by xBOBxSAGETx View Post
There is testing available for heavy metals in plant material.
Yes those tests exist, I think he meant nobody is spending their money to test that, which is weird with so many people growing in soil, myself included. Umass just seems to have the soil tests if I'm reading this right, plus as a federally accredited university I don't think they would want to be testing marijuana anyway. The 3 testing labs in Mass all seem to offer flower tests, but they seem expensive if I'm submitting a sample for each plant. Is there an easy way to home test for heavy metals in plants? And I mean if you get your soil tested before growing in it, that's a good general area of what to expect I'd imagine.
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Old 03-15-2019, 08:14 PM #6
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Quote:
Originally Posted by xBOBxSAGETx View Post
There is testing available for heavy metals in plant material.

Yep.


I'm pretty sure I could send a soil sample out to nearly any of the various soil testing labs for such or I could take a soil/tissue sample to the county Ag office. I'm pretty sure that there are a couple fertilizer companies that do this type of testing as well.
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Old 03-15-2019, 09:24 PM #7
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Old 03-15-2019, 09:59 PM #8
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All reputable soil makers-distributors will test for heavy metals. Any lab testing legal cannabis for the industry will also be doing so.
I tested all my soil and amendments that were not already tested. A good test (even for soil) costs around $200+.
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Old 03-15-2019, 10:03 PM #9
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In all reality, cannabis will and does pull heavy metals and even radioactive materials from the soil quite readily.

In terms of organic soil though, you go back to the cations and anions and what charges are present in the soil. If you have excessive free +/- charged particles for things to form bonds with, those bonds will be formed, and that includes heavy metals.

The trick is to make sure you have adequate iron, manganese, boron, and other essential micro elements. If these are present in the soil system in the right proportions, then the cation exchange sites are filled with these micro-nutrients instead of the heavy metals you're worried about.



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Old 03-15-2019, 10:47 PM #10
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Yeah and it an availability thing at different pHs as well.. for example at v.low acidity aluminium becomes super available..

With lots of humates any particularly agressively charged chemistry will remain locked up in them..

Toxicity in other growing methods is FAR FAR more likely so long as you use a sensible organic soil recipe.. with bottled nutes you're forcing them to eat what you want which can be much more toxic than preparing a microbe rich soil and letting the plant and the microbes figure it all out..

Cannabis actually isnt that much more an agressive accumulator than most other plants if you look at the dry weight values in studies but we dont inhale broccoli or carrots and the lungs are a pretty poor elimination pathway..
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